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<h1>Problems from past IOAA</h1>
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18th IOAA 2025
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Theory-Instructions.pdf" target="_blank" rel="noopener">Theory-Instructions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Theory-Questions.pdf" target="_blank" rel="noopener">Theory-Questions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Theory-Solution.pdf" target="_blank" rel="noopener">Theory-Solution.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Theory-Summary-Answersheet.pdf" target="_blank" rel="noopener">Theory-Summary-Answersheet.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/DA-Instructions.pdf" target="_blank" rel="noopener">DA-Instructions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Data-Analysis-Questions.pdf" target="_blank" rel="noopener">Data-Analysis-Questions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Data-Analysis-Solutions.pdf" target="_blank" rel="noopener">Data-Analysis-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Data-Analysis-Summary-Answersheet.pdf" target="_blank" rel="noopener">Data-Analysis-Summary-Answersheet.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Group-Questions.pdf" target="_blank" rel="noopener">Group-Questions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Group-Solutions.pdf" target="_blank" rel="noopener">Group-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Group-Summary-Answersheet.pdf" target="_blank" rel="noopener">Group-Summary-Answersheet.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Group-Write-Up.pdf" target="_blank" rel="noopener">Group-Write-Up.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation%20examination%20planetarium%20round.pdf" target="_blank" rel="noopener">Observation examination planetarium round.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation%20examination%20sky%20map%20round.pdf" target="_blank" rel="noopener">Observation examination sky map round.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation%20examination%20telescope%20round.pdf" target="_blank" rel="noopener">Observation examination telescope round.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Planetarium-Questions.pdf" target="_blank" rel="noopener">Observation-Planetarium-Questions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Planetarium-Solutions.pdf" target="_blank" rel="noopener">Observation-Planetarium-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Planetarium-Summary-Answersheet.pdf" target="_blank" rel="noopener">Observation-Planetarium-Summary-Answersheet.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-SkyMap-Questions.pdf" target="_blank" rel="noopener">Observation-SkyMap-Questions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-SkyMap-Solutions.pdf" target="_blank" rel="noopener">Observation-SkyMap-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Planetarium-Solutions.pdf" target="_blank" rel="noopener">Observation-Planetarium-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Planetarium-Summary-Answersheet.pdf" target="_blank" rel="noopener">Observation-Planetarium-Summary-Answersheet.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-SkyMap-Questions.pdf" target="_blank" rel="noopener">Observation-SkyMap-Questions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-SkyMap-Solutions.pdf" target="_blank" rel="noopener">Observation-SkyMap-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Telescope-Questions.pdf" target="_blank" rel="noopener">Observation-Telescope-Questions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Telescope-Solutions.pdf" target="_blank" rel="noopener">Observation-Telescope-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Observation-Telesope-Summary-Answersheet.pdf" target="_blank" rel="noopener">Observation-Telesope-Summary-Answersheet.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OM01-A3.pdf" target="_blank" rel="noopener">Map-OM01-A3.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OM01-Solutions-A3.pdf" target="_blank" rel="noopener">Map-OM01-Solutions-A3.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OM02-A3.pdf" target="_blank" rel="noopener">Map-OM02-A3.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OM02-Solutions-A3.pdf" target="_blank" rel="noopener">Map-OM02-Solutions-A3.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OP01-Solutions.pdf" target="_blank" rel="noopener">Map-OP01-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OP01.pdf" target="_blank" rel="noopener">Map-OP01.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OP02-Solutions.pdf" target="_blank" rel="noopener">Map-OP02-Solutions.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OP02.pdf" target="_blank" rel="noopener">Map-OP02.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OT01-Solution.pdf" target="_blank" rel="noopener">Map-OT01-Solution.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/18th%20IOAA%202025/Map-OT01.pdf" target="_blank" rel="noopener">Map-OT01.pdf</a></p>
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<h5 class="mb-0">
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17th IOAA 2024
</a>
</h5>
</div>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Theory%202024%20IOAA.pdf" target="_blank" rel="noopener">Theory 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Theory%20Solutions%202024%20IOAA.pdf" target="_blank" rel="noopener">Theory Solutions 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Theory%20Marking%20Scheme%202024%20IOAA.pdf" target="_blank" rel="noopener">Theory Marking Scheme 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Data%20Analysis%202024%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Data%20Analysis%20Solutions%202024%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Solutions 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Data%20Analysis%20Marking%20Scheme%20rules%202024%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Marking Scheme rules 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Observation%202024%20IOAA.pdf" target="_blank" rel="noopener">Observation 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Observation%20Marking%20Scheme%202024%20IOAA.pdf" target="_blank" rel="noopener">Observation Marking Scheme 2024 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/17th%20IOAA%202024/Planetarium%202024%20IOAA.pdf" target="_blank" rel="noopener">Planetarium 2024 IOAA.pdf</a></p>
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<div class="card-header" id="heading2">
<h5 class="mb-0">
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16th IOAA 2023
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/16th%20IOAA%202023/Theory%20Short%20Questions%20with%20Solutions%202023%20IOAA.pdf" target="_blank" rel="noopener">Theory Short Questions with Solutions 2023 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/16th%20IOAA%202023/Theory%20Medium%20Questions%20with_%20Solutions%202023%20IOAA.pdf" target="_blank" rel="noopener">Theory Medium Questions with Solutions 2023 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/16th%20IOAA%202023/Theory%20Long%20Questions%20with%20Solutions%202023%20IOAA.pdf" target="_blank" rel="noopener">Theory Long Questions with Solutions 2023 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/16th%20IOAA%202023/Data%20Analysis%20Questions%20with%20Solutions%202023%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Questions with Solutions 2023 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/16th%20IOAA%202023/Observations%20Questions%20with%20Solutions%202023%20IOAA.pdf" target="_blank" rel="noopener">Observations Questions with Solutions 2023 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/16th%20IOAA%202023/Planetarium%20Questions%20with%20Solutions%202023%20IOAA.pdf" target="_blank" rel="noopener">Planetarium Questions with Solutions 2023 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/16th%20IOAA%202023/Group%20Competition%202023%20IOAA.pdf" target="_blank" rel="noopener">Group Competition 2023 IOAA.pdf</a></p>
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<div class="card-header" id="heading3">
<h5 class="mb-0">
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15th IOAA 2022
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/15th%20IOAA%202022/Data_Analysis_Problems_Final_2022_IOAA.pdf" target="_blank" rel="noopener"></a><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/15th%20IOAA%202022/Theory_Final_2022_IOAA.pdf" target="_blank" rel="noopener">Theory_Final_2022_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/15th%20IOAA%202022/Data_Analysis_Problems_Final_2022_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_Problems_Final_2022_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/15th%20IOAA%202022/Day_Time_Observation_Problems_Final_2022_IOAA.pdf" target="_blank" rel="noopener">Day_Time_Observation_Problems_Final_2022_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/15th%20IOAA%202022/Night_Time_Observation_Problems_final_2022_IOAA.pdf" target="_blank" rel="noopener">Night_Time_Observation_Problems_final_2022_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/15th%20IOAA%202022/Observation_alternative_2022_IOAA.pdf" target="_blank" rel="noopener">Observation_alternative_2022_IOAA.pdf</a></p>
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<h5 class="mb-0">
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14th IOAA 2021
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Theory%20Problems%202021%20IOAA.pdf" target="_blank" rel="noopener">Theory Problems 2021 IOAA.pdf</a></p>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Data%20Analysis%201%20Solutions%202021%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis 1 Solutions 2021 IOAA.pdf</a></p>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Data%20Analysis%202%20Solutions%202021%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis 2 Solutions 2021 IOAA.pdf</a></p>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Observational%20Exam%20Solar%20Physics%202021%20IOAA.pdf" target="_blank" rel="noopener"></a><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Oservational%20Exam%20Solar%20Physics%20Instructions%202021%20IOAA.pdf" target="_blank" rel="noopener">Observational Exam Solar Physics Instructions 2021 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Observational%20Exam%20Solar%20Physics%202021%20IOAA.pdf" target="_blank" rel="noopener">Observational Exam Solar Physics 2021 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Observational%20Exam%20Solar%20Physics%20Solutions%202021%20IOAA.pdf" target="_blank" rel="noopener">Observational Exam Solar Physics Solutions 2021 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Planetarium%20Exam%20Instructions%202021%20IOAA.pdf" target="_blank" rel="noopener">Planetarium Exam Instructions 2021 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Planetarium%20Exam%20Problems%202021%20IOAA.pdf" target="_blank" rel="noopener">Planetarium Exam Problems 2021 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Planetarium%20Exam%20Solutions%202021%20IOAA.pdf" target="_blank" rel="noopener">Planetarium Exam Solutions 2021 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Planetarium%20Exam%20Simulation%202021%20IOAA.ppsx" target="_blank" rel="noopener">Planetarium Exam Simulation 2021 IOAA.ppsx</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Team%20Competition%202021%20IOAA.pdf" target="_blank" rel="noopener">Team Competition 2021 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/14th%20IOAA%202021/Team%20Competition%20Solutions%202021%20IOAA.pdf" target="_blank" rel="noopener">Team Competition Solutions 2021 IOAA.pdf</a></p>
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<div class="card">
<div class="card-header" id="heading4">
<h5 class="mb-0">
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1st GeCAA 2020
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/GeCAA/Theory_2020_GeCAA.pdf" target="_blank" rel="noopener">Theory_2020_GeCAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/GeCAA/Theory_Solutions_2020_GeCAA.pdf" target="_blank" rel="noopener">Theory_Solutions_2020_GeCAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/GeCAA/Data_Analysis_2020_GeCAA.pdf" target="_blank" rel="noopener">Data_Analysis_2020_GeCAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/GeCAA/Data_Analysis_solutions_2020_GeCAA.pdf" target="_blank" rel="noopener">Data_Analysis_solutions_2020_GeCAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/GeCAA/Observation_2020_GeCAA.pdf" target="_blank" rel="noopener">Observation_2020_GeCAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/GeCAA/Student%20User%20Guide%20With%20Screenshots.pdf" target="_blank" rel="noopener">Student User Guide With Screenshots.pdf</a></p>
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<div class="card">
<div class="card-header" id="heading11">
<h5 class="mb-0">
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13th IOAA 2019
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Theory_problem_2019_IOAA.pdf" target="_blank" rel="noopener">Theory_problem_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Theory_solution_2019_IOAA.pdf" target="_blank" rel="noopener">Theory_solution_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Theory_answersheet_2019_IOAA.pdf" target="_blank" rel="noopener">Theory_answersheet_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Data_Analysis_problem_2019_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_problem_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Data_Analysis_solution_2019_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_solution_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Data_Analysis_answersheet_2019_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_answersheet_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Observational_Round_problem_2019_IOAA.pdf" target="_blank" rel="noopener">Observational_Round_problem_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Observational_Round_solution_2019_IOAA.pdf" target="_blank" rel="noopener">Observational_Round_solution_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Planetarium_Round_problem_2019_IOAA.pdf" target="_blank" rel="noopener">Planetarium_Round_problem_2019_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/13th%20IOAA%202019/Planetarium_Round_solution_2019_IOAA.pdf" target="_blank" rel="noopener">Planetarium_Round_solution_2019_IOAA.pdf</a></p>
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<div class="card">
<div class="card-header" id="heading10">
<h5 class="mb-0">
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12th IOAA 2018
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/12th%20IOAA%202018/Theory_problem_2018_IOAA.pdf" target="_blank" rel="noopener">Theory_problem_2018_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/12th%20IOAA%202018/Theory_solution_2018_IOAA.pdf" target="_blank" rel="noopener">Theory_solution_2018_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/12th%20IOAA%202018/Data_Analysis_problem_2018_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_problem_2018_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/12th%20IOAA%202018/Data_Analysis_solution_2018_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_solution_2018_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/12th%20IOAA%202018/Observational_Competition_Day_problem_2018_IOAA.pdf" target="_blank" rel="noopener">Observational_Competition_Day_problem_2018_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/12th%20IOAA%202018/Observational_Competition_Night_problem_2018_IOAA.pdf" target="_blank" rel="noopener">Observational_Competition_Night_problem_2018_IOAA.pdf</a></p>
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<div class="card">
<div class="card-header" id="heading9">
<h5 class="mb-0">
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11th IOAA 2017
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/11th%20IOAA%202017/Theory_problem_2017_IOAA.pdf" target="_blank" rel="noopener">Theory_problem_2017_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/11th%20IOAA%202017/Theory_solution_2017_IOAA.pdf" target="_blank" rel="noopener">Theory_solution_2017_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/11th%20IOAA%202017/Data_Analysis_problem_2017_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_problem_2017_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/11th%20IOAA%202017/Data_Analysis_solution_2017_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_solution_2017_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/11th%20IOAA%202017/Observational_Examination_Day_problem_2017_IOAA.pdf" target="_blank" rel="noopener">Observational_Examination_Day_problem_2017_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/11th%20IOAA%202017/Observational_Examination_Night_problem_2017_IOAA.pdf" target="_blank" rel="noopener">Observational_Examination_Night_problem_2017_IOAA.pdf</a></p>
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<div class="card-header" id="heading8">
<h5 class="mb-0">
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10th IOAA 2016
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/10th%20IOAA%202016/Theory_problem_2016_IOAA.pdf" target="_blank" rel="noopener">Theory_problem_2016_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/10th%20IOAA%202016/Theory_solution_2016_IOAA.pdf" target="_blank" rel="noopener">Theory_solution_2016_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/10th%20IOAA%202016/Data_Analyis_problem_2016_IOAA.pdf" target="_blank" rel="noopener">Data_Analyis_problem_2016_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/10th%20IOAA%202016/Data_Analysis_solution_2016_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_solution_2016_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/10th%20IOAA%202016/Observational_Examination_problem_2016_IOAA.pdf" target="_blank" rel="noopener">Observational_Examination_problem_2016_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/10th%20IOAA%202016/Group_Examination_problem_2016_IOAA.pdf" target="_blank" rel="noopener">Group_Examination_problem_2016_IOAA.pdf</a></p>
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<div class="card">
<div class="card-header" id="heading7">
<h5 class="mb-0">
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9th IOAA 2015
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</h5>
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Short_Problem_problem_2015_IOAA.pdf" target="_blank" rel="noopener">Short_Problem_problem_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Short_Problem_solution_2015_IOAA.pdf" target="_blank" rel="noopener">Short_Problem_solution_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Long_Problem_problem_2015_IOAA.pdf" target="_blank" rel="noopener">Long_Problem_problem_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Long_Problem_solution_2015_IOAA.pdf" target="_blank" rel="noopener">Long_Problem_solution_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Data_Analysis_problem_2015_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_problem_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Data_Analysis_solution_2015_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_solution_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Team_Competition_problem_2015_IOAA.pdf" target="_blank" rel="noopener">Team_Competition_problem_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Team_Competition_solution_2015_IOAA.pdf" target="_blank" rel="noopener">Team_Competition_solution_2015_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/9th%20IOAA%202015/Table%20of%20constants.pdf" target="_blank" rel="noopener">Table of constants.pdf</a></p>
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8th IOAA 2014
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Short_Problem_problemAndSolution_2014_IOAA.pdf" target="_blank" rel="noopener">Short_Problem_problemAndSolution_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Long_Problem_problem_2014_IOAA.pdf" target="_blank" rel="noopener">Long_Problem_problem_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Long_Problem_solution_2014_IOAA.pdf" target="_blank" rel="noopener">Long_Problem_solution_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Data_Analysis_problem_2014_IOAA.pdf" target="_blank" rel="noopener">Data_Analysis_problem_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Marking_scheme_planetarium_solution_2014_IOAA.pdf" target="_blank" rel="noopener">Marking_scheme_planetarium_solution_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Observation_Outdoor_problem_2014_IOAA.pdf" target="_blank" rel="noopener">Observation_Outdoor_problem_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Observation_planetarium_problem_2014_IOAA.pdf" target="_blank" rel="noopener">Observation_planetarium_problem_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Team_Competition_problem_2014_IOAA.pdf" target="_blank" rel="noopener">Team_Competition_problem_2014_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/8th%20IOAA%202014/Team_Competition_solution_2014.pdf" target="_blank" rel="noopener">Team_Competition_solution_2014.pdf</a></p>
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7th IOAA 2013
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/7th%20IOAA%202013/Short_Problems_and_solutions_2013_IOAA.pdf" target="_blank" rel="noopener">Short_Problems_and_solutions_2013_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/7th%20IOAA%202013/Long_Problem_And_Solution_2013_IOAA.pdf" target="_blank" rel="noopener">Long_Problem_And_Solution_2013_IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/7th%20IOAA%202013/Data%20Analysis%20with%20markings%20Leaders%20without%205%20solar%20figures%202013%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis with markings Leaders without 5 solar figures 2013 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/7th%20IOAA%202013/Observational%20Test%20day%20indoors%202013%20IOAA.pdf" target="_blank" rel="noopener">Observational Test day indoors 2013 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/7th%20IOAA%202013/Observational%20Test%20Night%202013%20IOAA.pdf" target="_blank" rel="noopener">Observational Test Night 2013 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/7th%20IOAA%202013/Team%20competition%20Horizontal%20questions%202013%20IOAA.pdf" target="_blank" rel="noopener">Team competition Horizontal questions 2013 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/7th%20IOAA%202013/Team%20competition%20Vertical%20questions%202013%20IOAA.pdf" target="_blank" rel="noopener">Team competition Vertical questions 2013 IOAA.pdf</a></p>
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6th IOAA 2012
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/6th%20IOAA%202012/Short%20Problem_problem_2012.pdf" target="_blank" rel="noopener">Short Problem_problem_2012.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/6th%20IOAA%202012/Long%20Problem_problem_2012.pdf" target="_blank" rel="noopener">Long Problem_problem_2012.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/6th%20IOAA%202012/Data%20Analysis_problem_2012.pdf" target="_blank" rel="noopener">Data Analysis_problem_2012.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/6th%20IOAA%202012/Observational%20Exam_problem_2012.pdf" target="_blank" rel="noopener">Observational Exam_problem_2012.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/6th%20IOAA%202012/Team%20Competition_problem_2012.pdf" target="_blank" rel="noopener">Team Competition_problem_2012.pdf</a></p>
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<div class="card-header" id="heading15">
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5th IOAA 2011
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/5th%20IOAA%202011/Short%20Problem%202011%20IOAA.pdf" target="_blank" rel="noopener">Short Problems 2011 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/5th%20IOAA%202011/Long%20Problems%202011%20IOAA.pdf" target="_blank" rel="noopener">Long Problems 2011 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/5th%20IOAA%202011/Data%20Analysis%20Problems%202011%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Problems 2011 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/5th%20IOAA%202011/Night%20Observation%20Problems%202011%20IOAA.pdf" target="_blank" rel="noopener">Night Observation Problems 2011 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/5th%20IOAA%202011/Planetary%20Observation%20Problems%202011%20IOAA.pdf" target="_blank" rel="noopener">Planetary Observation Problems 2011 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/5th%20IOAA%202011/Group%20Competition%20Problem%202011%20IOAA.pdf" target="_blank" rel="noopener">Group Competition Problem 2011 IOAA.pdf</a></p>
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4th IOAA 2010
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/4th%20IOAA%202010/Short%20Problems%20and%20Solutions%202010%20IOAA.pdf" target="_blank" rel="noopener">Short Problems and Solutions 2010 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/4th%20IOAA%202010/Long%20Problems%20and%20Solutions%202010%20IOAA.pdf" target="_blank" rel="noopener">Long Problems and Solutions 2010 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/4th%20IOAA%202010/Data%20Analysis%202010%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis 2010 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/4th%20IOAA%202010/Data%20Analysis%20Solutions%202010%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Solutions 2010 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/4th%20IOAA%202010/Observation%20Problems%202010%20IOAA.pdf" target="_blank" rel="noopener">Observation Problems 2010 IOAA.pdf</a></p>
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3rd IOAA 2009
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Short%20Problems%20Solutions%202009%20IOAA.pdf" target="_blank" rel="noopener">Short Problems Solutions 2009 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Long%20Problems%202009%20IOAA.pdf" target="_blank" rel="noopener">Long Problems 2009 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Long%20Problems%20Solutions%202009%20IOAA.pdf" target="_blank" rel="noopener">Long Problems Solutions 2009 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Data%20Analysis%20Problems%202009%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Problems 2009 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Data%20Analysis%20Solutions%202009%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Solutions 2009 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Data%20Analysis%20table%202009%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis table 2009 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Observation%20Problems%202009%20IOAA.pdf" target="_blank" rel="noopener">Observation Problems 2009 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/3rd%20IOAA%202009/Observation%20Solution%202009%20IOAA.pdf" target="_blank" rel="noopener">Observation Solution 2009 IOAA.pdf</a></p>
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2nd IOAA 2008
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/2nd%20IOAA%202008/Short%20Problems%202008%20IOAA.pdf" target="_blank" rel="noopener">Short Problems 2008 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/2nd%20IOAA%202008/Short%20Problems%20Solutions%202008%20IOAA.pdf" target="_blank" rel="noopener">Short Problems Solutions 2008 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/2nd%20IOAA%202008/Long%20Problems%20Problems%202008%20IOAA.pdf" target="_blank" rel="noopener">Long Problems Problems 2008 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/2nd%20IOAA%202008/Long%20Problems%20Solutions%202008%20IOAA.pdf" target="_blank" rel="noopener">Long Problems Solutions 2008 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/2nd%20IOAA%202008/Data%20Analysis%20Problems%202008%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Problems 2008 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/2nd%20IOAA%202008/Observation%20Problems%202008%20IOAA.pdf" target="_blank" rel="noopener">Observation Problems 2008 IOAA.pdf</a></p>
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1st IOAA 2007
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<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/1st%20IOAA%202007/Theory%20Solutions%202007%20IOAA.pdf" target="_blank" rel="noopener">Theory Solutions 2007 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/1st%20IOAA%202007/Data%20Analysis%20Problems%202007%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Problems 2007 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/1st%20IOAA%202007/Data%20Analysis%20Solutions%202007%20IOAA.pdf" target="_blank" rel="noopener">Data Analysis Solutions 2007 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/1st%20IOAA%202007/Observation%20Problems%202007%20IOAA.pdf" target="_blank" rel="noopener">Observation Problems 2007 IOAA.pdf</a></p>
<p><a href="https://cdn.ioaastrophysics.org/assets/IOAA%20problems/1st%20IOAA%202007/Observation%20Solutions%202007%20IOAA.pdf" target="_blank" rel="noopener">Observation Solutions 2007 IOAA.pdf</a></p>
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