solar_position_reference.md

# Solar Position Reference — April 2026 Recording Sessions

This document provides hourly solar azimuth and altitude tables for each recording date,
along with per-session solar position estimates (linearly interpolated to each session's
start time) that can be joined to `session_recording_info.csv` on `Participant` + `Session`.

All coordinates are for the recording site. Azimuth is measured clockwise from North (0°).
Altitude is elevation above the horizon. Data format: **DDD MM SS.ss** (degrees minutes seconds).

---

## 1. Hourly Solar Position Tables

### 2026-04-02

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)   |
|:------------:|------------------|-------------------|--------------|-------------|
| 00           | 322 14 23.45     | -59 53 02.99      | 00 43 44.52  | 04 42 03.73 |
| 01           | 352 54 34.70     | -65 24 58.37      | 00 43 53.78  | 04 43 01.50 |
| 02           | 027 07 20.91     | -62 50 59.36      | 00 44 03.04  | 04 43 59.28 |
| 03           | 050 14 30.70     | -53 52 25.58      | 00 44 12.28  | 04 44 57.07 |
| 04           | 063 51 39.00     | -41 57 50.97      | 00 44 21.52  | 04 45 54.86 |
| 05           | 072 39 38.56     | -28 49 27.30      | 00 44 30.72  | 04 46 52.66 |
| 06           | 079 07 20.20     | -15 07 04.87      | 00 44 39.90  | 04 47 50.46 |
| 07           | 084 28 40.37     | -01 08 03.98      | 00 44 49.04  | 04 48 48.25 |
| 08           | 089 28 00.17     | +12 58 20.29      | 00 44 58.14  | 04 49 46.04 |
| 09           | 094 43 17.37     | +27 05 21.66      | 00 45 07.21  | 04 50 43.81 |
| 10           | 101 06 28.05     | +41 05 02.20      | 00 45 16.24  | 04 51 41.57 |
| 11           | 110 26 13.14     | +54 41 40.62      | 00 45 25.24  | 04 52 39.31 |
| 12           | 127 57 33.44     | +67 07 05.71      | 00 45 34.23  | 04 53 37.03 |
| 13           | 168 44 42.47     | +74 56 41.13      | 00 45 43.20  | 04 54 34.72 |
| 14           | 220 07 52.14     | +71 06 51.89      | 00 45 52.17  | 04 55 32.38 |
| 15           | 244 21 20.11     | +59 46 57.39      | 00 46 01.15  | 04 56 30.02 |
| 16           | 255 53 54.00     | +46 28 51.47      | 00 46 10.14  | 04 57 27.63 |
| 17           | 263 07 54.83     | +32 35 48.35      | 00 46 19.17  | 04 58 25.23 |
| 18           | 268 42 47.70     | +18 30 58.74      | 00 46 28.22  | 04 59 22.80 |
| 19           | 273 44 55.86     | +04 24 13.96      | 00 46 37.31  | 05 00 20.35 |
| 20           | 278 55 02.01     | -09 37 33.91      | 00 46 46.44  | 05 01 17.90 |
| 21           | 284 52 59.89     | -23 26 25.83      | 00 46 55.60  | 05 02 15.44 |
| 22           | 292 37 49.02     | -36 48 52.21      | 00 47 04.80  | 05 03 12.98 |
| 23           | 304 01 20.07     | -49 16 05.12      | 00 47 14.03  | 05 04 10.52 |

---

### 2026-04-17

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 329 24 42.42     | -55 42 11.27      | 01 38 49.47  | 10 16 11.85  |
| 01           | 356 11 03.96     | -59 57 35.98      | 01 38 58.89  | 10 17 04.87  |
| 02           | 024 20 58.87     | -57 21 49.85      | 01 39 08.31  | 10 17 57.92  |
| 03           | 045 06 19.13     | -49 12 15.36      | 01 39 17.73  | 10 18 50.98  |
| 04           | 058 32 21.04     | -38 02 38.79      | 01 39 27.12  | 10 19 44.06  |
| 05           | 067 34 59.04     | -25 25 41.33      | 01 39 36.50  | 10 20 37.14  |
| 06           | 074 13 35.04     | -12 04 13.31      | 01 39 45.84  | 10 21 30.23  |
| 07           | 079 35 09.95     | +01 41 29.72      | 01 39 55.14  | 10 22 23.31  |
| 08           | 084 21 02.14     | +15 40 46.17      | 01 40 04.41  | 10 23 16.38  |
| 09           | 089 04 33.78     | +29 46 52.81      | 01 40 13.64  | 10 24 09.41  |
| 10           | 094 28 08.29     | +43 53 58.38      | 01 40 22.84  | 10 25 02.42  |
| 11           | 102 02 03.91     | +57 53 00.51      | 01 40 32.01  | 10 25 55.38  |
| 12           | 117 05 31.24     | +71 15 11.51      | 01 40 41.16  | 10 26 48.29  |
| 13           | 168 25 57.23     | +80 35 05.08      | 01 40 50.30  | 10 27 41.15  |
| 14           | 235 45 41.70     | +74 22 13.18      | 01 40 59.44  | 10 28 33.96  |
| 15           | 255 22 01.22     | +61 24 27.22      | 01 41 08.59  | 10 29 26.71  |
| 16           | 264 01 35.83     | +47 30 38.38      | 01 41 17.76  | 10 30 19.41  |
| 17           | 269 46 50.69     | +33 24 52.68      | 01 41 26.95  | 10 31 12.07  |
| 18           | 274 36 31.73     | +19 18 31.44      | 01 41 36.18  | 10 32 04.68  |
| 19           | 279 19 45.29     | +05 17 46.52      | 01 41 45.44  | 10 32 57.27  |
| 20           | 284 30 25.31     | -08 31 02.37      | 01 41 54.75  | 10 33 49.84  |
| 21           | 290 46 28.93     | -21 58 27.30      | 01 42 04.09  | 10 34 42.40  |
| 22           | 299 06 14.71     | -34 47 12.48      | 01 42 13.46  | 10 35 34.96  |
| 23           | 311 12 08.25     | -46 21 47.13      | 01 42 22.87  | 10 36 27.53  |

---

### 2026-04-18

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 329 48 02.12     | -55 25 19.84      | 01 42 32.29  | 10 37 20.10  |
| 01           | 356 20 22.49     | -59 36 43.26      | 01 42 41.73  | 10 38 12.70  |
| 02           | 024 11 21.21     | -57 01 05.20      | 01 42 51.17  | 10 39 05.31  |
| 03           | 044 48 17.99     | -48 54 25.80      | 01 43 00.60  | 10 39 57.94  |
| 04           | 058 12 59.90     | -37 47 41.19      | 01 43 10.01  | 10 40 50.59  |
| 05           | 067 16 04.56     | -25 12 51.96      | 01 43 19.40  | 10 41 43.24  |
| 06           | 073 55 03.73     | -11 52 54.70      | 01 43 28.76  | 10 42 35.90  |
| 07           | 079 16 25.99     | +01 51 45.43      | 01 43 38.08  | 10 43 28.55  |
| 08           | 084 01 13.24     | +15 50 21.28      | 01 43 47.36  | 10 44 21.18  |
| 09           | 088 42 24.26     | +29 56 08.94      | 01 43 56.60  | 10 45 13.78  |
| 10           | 094 01 32.87     | +44 03 23.62      | 01 44 05.82  | 10 46 06.35  |
| 11           | 101 27 00.48     | +58 03 26.52      | 01 44 15.00  | 10 46 58.88  |
| 12           | 116 14 30.07     | +71 28 55.33      | 01 44 24.17  | 10 47 51.35  |
| 13           | 168 20 59.79     | +80 56 22.45      | 01 44 33.33  | 10 48 43.77  |
| 14           | 236 55 45.61     | +74 32 16.00      | 01 44 42.48  | 10 49 36.14  |
| 15           | 256 05 26.76     | +61 29 11.10      | 01 44 51.65  | 10 50 28.44  |
| 16           | 264 32 45.77     | +47 33 49.78      | 01 45 00.83  | 10 51 20.70  |
| 17           | 270 12 06.46     | +33 27 43.53      | 01 45 10.04  | 10 52 12.91  |
| 18           | 274 58 49.53     | +19 21 36.73      | 01 45 19.28  | 10 53 05.08  |
| 19           | 279 40 46.17     | +05 21 31.27      | 01 45 28.57  | 10 53 57.22  |
| 20           | 284 51 20.71     | -08 26 13.19      | 01 45 37.88  | 10 54 49.34  |
| 21           | 291 08 18.46     | -21 52 02.18      | 01 45 47.24  | 10 55 41.45  |
| 22           | 299 29 46.07     | -34 38 26.17      | 01 45 56.63  | 10 56 33.56  |
| 23           | 311 37 14.29     | -46 09 33.96      | 01 46 06.05  | 10 57 25.67  |

---

### 2026-04-20

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 330 32 47.70     | -54 51 43.26      | 01 49 59.10  | 11 19 04.60  |
| 01           | 356 37 45.92     | -58 55 26.73      | 01 50 08.57  | 11 19 56.29  |
| 02           | 023 52 28.84     | -56 20 10.49      | 01 50 18.04  | 11 20 48.00  |
| 03           | 044 13 05.18     | -48 19 14.75      | 01 50 27.51  | 11 21 39.72  |
| 04           | 057 34 59.88     | -37 18 10.58      | 01 50 36.95  | 11 22 31.46  |
| 05           | 066 38 48.96     | -24 47 37.74      | 01 50 46.37  | 11 23 23.21  |
| 06           | 073 18 28.38     | -11 30 43.76      | 01 50 55.76  | 11 24 14.96  |
| 07           | 078 39 21.42     | +02 11 47.70      | 01 51 05.12  | 11 25 06.70  |
| 08           | 083 21 55.94     | +16 08 58.46      | 01 51 14.43  | 11 25 58.43  |
| 09           | 087 58 22.62     | +30 14 02.90      | 01 51 23.71  | 11 26 50.12  |
| 10           | 093 08 32.64     | +44 21 28.24      | 01 51 32.96  | 11 27 41.78  |
| 11           | 100 16 39.00     | +58 23 20.84      | 01 51 42.18  | 11 28 33.39  |
| 12           | 114 29 48.38     | +71 55 08.19      | 01 51 51.38  | 11 29 24.95  |
| 13           | 168 08 26.35     | +81 38 21.43      | 01 52 00.57  | 11 30 16.45  |
| 14           | 239 17 53.47     | +74 51 10.80      | 01 52 09.76  | 11 31 07.89  |
| 15           | 257 31 38.00     | +61 38 03.65      | 01 52 18.95  | 11 31 59.27  |
| 16           | 265 34 22.22     | +47 39 55.99      | 01 52 28.17  | 11 32 50.59  |
| 17           | 271 01 58.93     | +33 33 19.02      | 01 52 37.42  | 11 33 41.87  |
| 18           | 275 42 48.63     | +19 27 47.75      | 01 52 46.69  | 11 34 33.10  |
| 19           | 280 22 11.43     | +05 29 05.91      | 01 52 56.01  | 11 35 24.30  |
| 20           | 285 32 32.04     | -08 16 26.27      | 01 53 05.36  | 11 36 15.48  |
| 21           | 291 51 10.88     | -21 39 01.19      | 01 53 14.75  | 11 37 06.65  |
| 22           | 300 15 47.95     | -34 20 42.58      | 01 53 24.18  | 11 37 57.82  |
| 23           | 312 26 00.35     | -45 45 00.97      | 01 53 33.63  | 11 38 48.99  |

---

### 2026-04-21

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 330 54 14.57     | -54 34 59.13      | 01 53 43.11  | 11 39 40.18  |
| 01           | 356 45 52.07     | -58 35 03.71      | 01 53 52.60  | 11 40 31.39  |
| 02           | 023 43 13.40     | -56 00 01.17      | 01 54 02.09  | 11 41 22.62  |
| 03           | 043 55 52.88     | -48 01 54.10      | 01 54 11.57  | 11 42 13.87  |
| 04           | 057 16 20.91     | -37 03 38.36      | 01 54 21.03  | 11 43 05.13  |
| 05           | 066 20 28.06     | -24 35 13.59      | 01 54 30.47  | 11 43 56.41  |
| 06           | 073 00 24.73     | -11 19 52.02      | 01 54 39.88  | 11 44 47.68  |
| 07           | 078 21 01.35     | +02 21 33.78      | 01 54 49.25  | 11 45 38.95  |
| 08           | 083 02 28.25     | +16 18 00.14      | 01 54 58.58  | 11 46 30.19  |
| 09           | 087 36 31.46     | +30 22 40.40      | 01 55 07.88  | 11 47 21.41  |
| 10           | 092 42 09.27     | +44 30 07.33      | 01 55 17.14  | 11 48 12.59  |
| 11           | 099 41 23.46     | +58 32 48.80      | 01 55 26.38  | 11 49 03.72  |
| 12           | 113 36 11.29     | +72 07 36.19      | 01 55 35.59  | 11 49 54.79  |
| 13           | 168 00 36.77     | +81 59 02.24      | 01 55 44.80  | 11 50 45.81  |
| 14           | 240 29 49.79     | +75 00 02.71      | 01 55 54.01  | 11 51 36.77  |
| 15           | 258 14 20.98     | +61 42 12.90      | 01 56 03.22  | 11 52 27.66  |
| 16           | 266 04 47.41     | +47 42 51.26      | 01 56 12.46  | 11 53 18.50  |
| 17           | 271 26 34.70     | +33 36 03.96      | 01 56 21.72  | 11 54 09.28  |
| 18           | 276 04 29.13     | +19 30 53.65      | 01 56 31.01  | 11 55 00.03  |
| 19           | 280 42 35.07     | +05 32 55.83      | 01 56 40.35  | 11 55 50.74  |
| 20           | 285 52 47.25     | -08 11 28.66      | 01 56 49.72  | 11 56 41.43  |
| 21           | 292 12 13.04     | -21 32 25.65      | 01 56 59.13  | 11 57 32.11  |
| 22           | 300 38 17.81     | -34 11 45.87      | 01 57 08.57  | 11 58 22.78  |
| 23           | 312 49 40.11     | -45 32 42.02      | 01 57 18.05  | 11 59 13.47  |

---

### 2026-04-22

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 331 15 04.77     | -54 18 18.47      | 01 57 27.54  | 12 00 04.17  |
| 01           | 356 53 35.26     | -58 14 51.41      | 01 57 37.04  | 12 00 54.89  |
| 02           | 023 34 04.70     | -55 40 04.39      | 01 57 46.55  | 12 01 45.63  |
| 03           | 043 38 56.26     | -47 44 43.94      | 01 57 56.05  | 12 02 36.39  |
| 04           | 056 57 55.94     | -36 49 15.40      | 01 58 05.53  | 12 03 27.16  |
| 05           | 066 02 18.58     | -24 22 58.54      | 01 58 14.99  | 12 04 17.95  |
| 06           | 072 42 30.72     | -11 09 09.82      | 01 58 24.41  | 12 05 08.73  |
| 07           | 078 02 49.79     | +02 31 09.50      | 01 58 33.80  | 12 05 59.51  |
| 08           | 082 43 08.35     | +16 26 50.27      | 01 58 43.15  | 12 06 50.27  |
| 09           | 087 14 47.38     | +30 31 04.72      | 01 58 52.47  | 12 07 40.99  |
| 10           | 092 15 51.38     | +44 38 30.78      | 01 59 01.75  | 12 08 31.68  |
| 11           | 099 06 06.42     | +58 41 57.11      | 01 59 11.00  | 12 09 22.32  |
| 12           | 112 41 46.03     | +72 19 37.97      | 01 59 20.24  | 12 10 12.90  |
| 13           | 167 51 34.49     | +82 19 30.06      | 01 59 29.46  | 12 11 03.42  |
| 14           | 241 42 15.66     | +75 08 31.01      | 01 59 38.68  | 12 11 53.88  |
| 15           | 258 56 47.13     | +61 46 11.25      | 01 59 47.92  | 12 12 44.27  |
| 16           | 266 34 56.40     | +47 45 41.63      | 01 59 57.17  | 12 13 34.61  |
| 17           | 271 50 56.25     | +33 38 47.25      | 02 00 06.45  | 12 14 24.89  |
| 18           | 276 25 56.44     | +19 33 59.91      | 02 00 15.76  | 12 15 15.13  |
| 19           | 281 02 45.58     | +05 36 47.49      | 02 00 25.11  | 12 16 05.34  |
| 20           | 286 12 48.35     | -08 06 28.38      | 02 00 34.50  | 12 16 55.52  |
| 21           | 292 32 58.71     | -21 25 46.94      | 02 00 43.93  | 12 17 45.69  |
| 22           | 301 00 26.54     | -34 02 46.24      | 02 00 53.39  | 12 18 35.86  |
| 23           | 313 12 50.89     | -45 20 21.98      | 02 01 02.88  | 12 19 26.04  |

---

### 2026-04-23

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 331 35 18.79     | -54 01 41.77      | 02 01 12.40  | 12 20 16.23  |
| 01           | 357 00 56.05     | -57 54 50.20      | 02 01 21.92  | 12 21 06.44  |
| 02           | 023 25 02.41     | -55 20 20.52      | 02 01 31.44  | 12 21 56.68  |
| 03           | 043 22 15.05     | -47 27 44.70      | 02 01 40.96  | 12 22 46.93  |
| 04           | 056 39 44.92     | -36 35 02.11      | 02 01 50.46  | 12 23 37.20  |
| 05           | 065 44 20.65     | -24 10 52.94      | 02 01 59.93  | 12 24 27.48  |
| 06           | 072 24 46.56     | -10 58 37.45      | 02 02 09.38  | 12 25 17.76  |
| 07           | 077 44 47.04     | +02 40 34.61      | 02 02 18.78  | 12 26 08.03  |
| 08           | 082 23 56.62     | +16 35 28.68      | 02 02 28.15  | 12 26 58.28  |
| 09           | 086 53 10.93     | +30 39 15.68      | 02 02 37.48  | 12 27 48.50  |
| 10           | 091 49 39.75     | +44 46 38.46      | 02 02 46.78  | 12 28 38.68  |
| 11           | 098 30 49.30     | +58 50 45.64      | 02 02 56.05  | 12 29 28.81  |
| 12           | 111 46 35.10     | +72 31 13.04      | 02 03 05.31  | 12 30 18.88  |
| 13           | 167 41 09.89     | +82 39 44.45      | 02 03 14.55  | 12 31 08.89  |
| 14           | 242 55 06.56     | +75 16 35.78      | 02 03 23.79  | 12 31 58.83  |
| 15           | 259 38 55.03     | +61 49 59.02      | 02 03 33.04  | 12 32 48.71  |
| 16           | 267 04 48.47     | +47 48 27.34      | 02 03 42.31  | 12 33 38.52  |
| 17           | 272 15 03.04     | +33 41 29.03      | 02 03 51.61  | 12 34 28.29  |
| 18           | 276 47 10.11     | +19 37 06.63      | 02 04 00.94  | 12 35 18.01  |
| 19           | 281 22 42.54     | +05 40 40.91      | 02 04 10.31  | 12 36 07.69  |
| 20           | 286 32 34.93     | -08 01 25.49      | 02 04 19.72  | 12 36 57.35  |
| 21           | 292 53 27.46     | -21 19 05.25      | 02 04 29.16  | 12 37 47.00  |
| 22           | 301 22 13.74     | -33 53 44.00      | 02 04 38.64  | 12 38 36.65  |
| 23           | 313 35 32.51     | -45 08 01.32      | 02 04 48.15  | 12 39 26.30  |

---

### 2026-04-24

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 331 54 57.02     | -53 45 09.57      | 02 04 57.68  | 12 40 15.98  |
| 01           | 357 07 54.90     | -57 35 00.54      | 02 05 07.23  | 12 41 05.67  |
| 02           | 023 16 06.24     | -55 00 49.97      | 02 05 16.77  | 12 41 55.38  |
| 03           | 043 05 48.97     | -47 10 56.84      | 02 05 26.31  | 12 42 45.12  |
| 04           | 056 21 47.85     | -36 20 58.91      | 02 05 35.82  | 12 43 34.87  |
| 05           | 065 26 34.41     | -23 58 57.16      | 02 05 45.32  | 12 44 24.63  |
| 06           | 072 07 12.47     | -10 48 15.23      | 02 05 54.78  | 12 45 14.39  |
| 07           | 077 26 53.38     | +02 49 48.86      | 02 06 04.20  | 12 46 04.15  |
| 08           | 082 04 53.43     | +16 43 55.12      | 02 06 13.59  | 12 46 53.88  |
| 09           | 086 31 42.59     | +30 47 13.13      | 02 06 22.94  | 12 47 43.58  |
| 10           | 091 23 35.15     | +44 54 30.25      | 02 06 32.26  | 12 48 33.24  |
| 11           | 097 55 33.48     | +58 59 14.25      | 02 06 41.55  | 12 49 22.85  |
| 12           | 110 50 41.12     | +72 42 20.98      | 02 06 50.82  | 12 50 12.40  |
| 13           | 167 29 11.44     | +82 59 44.95      | 02 07 00.08  | 12 51 01.88  |
| 14           | 244 08 17.94     | +75 24 17.23      | 02 07 09.34  | 12 51 51.30  |
| 15           | 260 20 43.40     | +61 53 36.61      | 02 07 18.61  | 12 52 40.65  |
| 16           | 267 34 22.99     | +47 51 08.70      | 02 07 27.90  | 12 53 29.93  |
| 17           | 272 38 54.64     | +33 44 09.53      | 02 07 37.22  | 12 54 19.17  |
| 18           | 277 08 09.77     | +19 40 13.94      | 02 07 46.57  | 12 55 08.35  |
| 19           | 281 42 25.61     | +05 44 36.15      | 02 07 55.96  | 12 55 57.50  |
| 20           | 286 52 06.65     | -07 56 20.01      | 02 08 05.38  | 12 56 46.63  |
| 21           | 293 13 38.97     | -21 12 20.68      | 02 08 14.85  | 12 57 35.75  |
| 22           | 301 43 39.16     | -33 44 39.37      | 02 08 24.35  | 12 58 24.86  |
| 23           | 313 57 44.92     | -44 55 40.37      | 02 08 33.88  | 12 59 13.98  |

---

### 2026-04-25

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 332 13 59.91     | -53 28 42.30      | 02 08 43.43  | 13 00 03.12  |
| 01           | 357 14 32.28     | -57 15 22.75      | 02 08 52.99  | 13 00 52.28  |
| 02           | 023 07 15.81     | -54 41 33.09      | 02 09 02.55  | 13 01 41.46  |
| 03           | 042 49 37.69     | -46 54 20.74      | 02 09 12.11  | 13 02 30.66  |
| 04           | 056 04 04.62     | -36 07 06.18      | 02 09 21.64  | 13 03 19.88  |
| 05           | 065 08 59.91     | -23 47 11.54      | 02 09 31.15  | 13 04 09.11  |
| 06           | 071 49 48.61     | -10 38 03.45      | 02 09 40.63  | 13 04 58.35  |
| 07           | 077 09 09.05     | +02 58 51.99      | 02 09 50.08  | 13 05 47.57  |
| 08           | 081 45 59.10     | +16 52 09.44      | 02 09 59.48  | 13 06 36.77  |
| 09           | 086 10 22.83     | +30 54 56.93      | 02 10 08.85  | 13 07 25.94  |
| 10           | 090 57 38.29     | +45 02 06.04      | 02 10 18.19  | 13 08 15.07  |
| 11           | 097 20 20.29     | +59 07 22.86      | 02 10 27.50  | 13 09 04.14  |
| 12           | 109 54 06.90     | +72 53 01.43      | 02 10 36.79  | 13 09 53.15  |
| 13           | 167 15 25.87     | +83 19 31.17      | 02 10 46.07  | 13 10 42.09  |
| 14           | 245 21 45.17     | +75 31 35.58      | 02 10 55.35  | 13 11 30.97  |
| 15           | 261 02 11.02     | +61 57 04.43      | 02 11 04.64  | 13 12 19.78  |
| 16           | 268 03 39.37     | +47 53 45.98      | 02 11 13.95  | 13 13 08.52  |
| 17           | 273 02 30.63     | +33 46 48.92      | 02 11 23.28  | 13 13 57.21  |
| 18           | 277 28 55.06     | +19 43 21.94      | 02 11 32.65  | 13 14 45.85  |
| 19           | 282 01 54.45     | +05 48 33.23      | 02 11 42.06  | 13 15 34.45  |
| 20           | 287 11 23.17     | -07 51 12.01      | 02 11 51.51  | 13 16 23.03  |
| 21           | 293 33 32.90     | -21 05 33.40      | 02 12 00.99  | 13 17 11.60  |
| 22           | 302 04 42.50     | -33 35 32.64      | 02 12 10.51  | 13 18 00.17  |
| 23           | 314 19 28.04     | -44 43 19.56      | 02 12 20.06  | 13 18 48.74  |

---

### 2026-04-26

| Hour (UTC+9) | Azimuth (DMS)    | Altitude (DMS)    | RA (HMS)     | Dec (DMS)    |
|:------------:|------------------|-------------------|--------------|--------------|
| 00           | 332 32 27.89     | -53 12 20.42      | 02 12 29.63  | 13 19 37.33  |
| 01           | 357 20 48.60     | -56 55 57.20      | 02 12 39.21  | 13 20 25.94  |
| 02           | 022 58 30.81     | -54 22 30.22      | 02 12 48.79  | 13 21 14.58  |
| 03           | 042 33 40.90     | -46 37 56.83      | 02 12 58.36  | 13 22 03.23  |
| 04           | 055 46 35.18     | -35 53 24.33      | 02 13 07.92  | 13 22 51.91  |
| 05           | 064 51 37.24     | -23 35 36.43      | 02 13 17.45  | 13 23 40.59  |
| 06           | 071 32 35.16     | -10 28 02.40      | 02 13 26.95  | 13 24 29.28  |
| 07           | 076 51 34.32     | +03 07 43.78      | 02 13 36.41  | 13 25 17.96  |
| 08           | 081 27 14.00     | +17 00 11.42      | 02 13 45.84  | 13 26 06.61  |
| 09           | 085 49 12.15     | +31 02 26.93      | 02 13 55.23  | 13 26 55.24  |
| 10           | 090 31 49.95     | +45 09 25.73      | 02 14 04.58  | 13 27 43.81  |
| 11           | 096 45 11.18     | +59 15 11.39      | 02 14 13.91  | 13 28 32.34  |
| 12           | 108 56 55.65     | +73 03 14.05      | 02 14 23.22  | 13 29 20.79  |
| 13           | 166 59 37.52     | +83 39 02.63      | 02 14 32.52  | 13 30 09.18  |
| 14           | 246 35 23.38     | +75 38 31.13      | 02 14 41.82  | 13 30 57.50  |
| 15           | 261 43 16.62     | +62 00 22.87      | 02 14 51.12  | 13 31 45.75  |
| 16           | 268 32 36.97     | +47 56 19.46      | 02 15 00.45  | 13 32 33.94  |
| 17           | 273 25 50.55     | +33 49 27.39      | 02 15 09.81  | 13 33 22.07  |
| 18           | 277 49 25.57     | +19 46 30.75      | 02 15 19.20  | 13 34 10.15  |
| 19           | 282 21 08.68     | +05 52 32.19      | 02 15 28.62  | 13 34 58.19  |
| 20           | 287 30 24.13     | -07 46 01.53      | 02 15 38.09  | 13 35 46.21  |
| 21           | 293 53 08.89     | -20 58 43.54      | 02 15 47.59  | 13 36 34.21  |
| 22           | 302 25 23.45     | -33 26 24.06      | 02 15 57.13  | 13 37 22.22  |
| 23           | 314 40 41.75     | -44 30 59.28      | 02 16 06.70  | 13 38 10.23  |

---

## 2. Session–Solar Position Mapping

Solar azimuth and altitude are **linearly interpolated** to each session's `Start_Time_KST`
from the bracketing whole-hour values in the tables above.
Azimuth and altitude are given in **decimal degrees** for easier computation.

| Participant | Session     | Date       | Start_Time_KST | Azimuth_deg | Altitude_deg |
|-------------|-------------|------------|----------------|-------------|--------------|
| P1          | sunfacing   | 2026-04-17 | 14:08:27       | 238.52      | 72.54        |
| P1          | sunoccluded | 2026-04-17 | 14:11:54       | 239.65      | 71.80        |
| P2          | sunfacing   | 2026-04-17 | 15:28:05       | 259.42      | 54.90        |
| P2          | sunoccluded | 2026-04-17 | 15:31:14       | 259.87      | 54.17        |
| P3          | sunfacing   | 2026-04-17 | 17:11:01       | 270.67      | 30.82        |
| P3          | sunoccluded | 2026-04-17 | 17:14:44       | 270.97      | 29.95        |
| P4          | sunfacing   | 2026-04-18 | 09:11:47       | 89.75       | 32.71        |
| P4          | sunoccluded | 2026-04-18 | 09:15:34       | 90.09       | 33.60        |
| P5          | sunfacing   | 2026-04-18 | 12:33:49       | 145.61      | 76.81        |
| P5          | sunoccluded | 2026-04-18 | 12:36:57       | 148.33      | 77.31        |
| P6          | sunfacing   | 2026-04-18 | 14:17:26       | 242.50      | 70.75        |
| P6          | sunoccluded | 2026-04-18 | 14:20:32       | 243.49      | 70.07        |
| P7          | sunfacing   | 2026-04-18 | 15:21:15       | 259.09      | 56.56        |
| P7          | sunoccluded | 2026-04-18 | 15:24:02       | 259.48      | 55.91        |
| P8          | sunfacing   | 2026-04-18 | 16:54:35       | 269.69      | 34.73        |
| P8          | sunoccluded | 2026-04-18 | 16:57:20       | 269.95      | 34.09        |
| P9          | sunfacing   | 2026-04-20 | 11:17:46       | 104.49      | 62.40        |
| P9          | sunoccluded | 2026-04-20 | 11:21:37       | 105.40      | 63.27        |
| P10         | sunfacing   | 2026-04-20 | 18:00:25       | 275.02      | 19.26        |
| P10         | sunoccluded | 2026-04-20 | 18:03:24       | 275.29      | 18.57        |
| P11         | sunfacing   | 2026-04-21 | 16:05:33       | 266.58      | 46.41        |
| P11         | sunoccluded | 2026-04-21 | 16:10:44       | 267.04      | 45.19        |
| P12         | sunfacing   | 2026-04-22 | 11:03:08       | 99.81       | 59.41        |
| P12         | sunoccluded | 2026-04-22 | 11:05:45       | 100.41      | 60.01        |
| P13         | sunfacing   | 2026-04-22 | 12:14:27       | 125.98      | 74.74        |
| P13         | sunoccluded | 2026-04-22 | 12:18:03       | 129.29      | 75.33        |
| P14         | sunfacing   | 2026-04-22 | 13:17:21       | 189.22      | 80.25        |
| P14         | sunoccluded | 2026-04-22 | 13:20:34       | 193.17      | 79.86        |
| P15         | sunfacing   | 2026-04-22 | 14:21:07       | 247.77      | 70.44        |
| P15         | sunoccluded | 2026-04-22 | 14:23:51       | 248.56      | 69.83        |
| P16         | sunfacing   | 2026-04-22 | 15:06:40       | 259.79      | 60.21        |
| P16         | sunoccluded | 2026-04-22 | 15:15:05       | 260.87      | 58.25        |
| P17         | sunfacing   | 2026-04-22 | 16:02:18       | 266.78      | 47.22        |
| P17         | sunoccluded | 2026-04-22 | 16:07:06       | 267.21      | 46.09        |
| P18         | sunfacing   | 2026-04-22 | 17:03:36       | 272.12      | 32.80        |
| P18         | sunoccluded | 2026-04-22 | 17:07:02       | 272.39      | 32.00        |
| P19         | sunfacing   | 2026-04-23 | 09:13:30       | 88.00       | 33.83        |
| P19         | sunoccluded | 2026-04-23 | 09:16:29       | 88.24       | 34.54        |
| P20         | sunfacing   | 2026-04-23 | 10:35:29       | 95.78       | 53.10        |
| P20         | sunoccluded | 2026-04-23 | 10:38:41       | 96.14       | 53.85        |
| P21         | sunfacing   | 2026-04-23 | 12:12:25       | 123.34      | 74.62        |
| P21         | sunoccluded | 2026-04-23 | 12:15:22       | 126.10      | 75.12        |
| P22         | sunfacing   | 2026-04-23 | 14:57:21       | 258.91      | 62.42        |
| P22         | sunoccluded | 2026-04-23 | 15:00:08       | 259.67      | 61.80        |
| P23         | sunfacing   | 2026-04-23 | 16:13:54       | 268.28      | 44.54        |
| P23         | sunoccluded | 2026-04-23 | 16:16:59       | 268.54      | 43.81        |
| P24         | sunfacing   | 2026-04-24 | 14:08:04       | 246.32      | 73.59        |
| P24         | sunoccluded | 2026-04-24 | 14:16:26       | 248.58      | 71.70        |
| P25         | sunfacing   | 2026-04-24 | 15:11:18       | 261.71      | 59.25        |
| P25         | sunoccluded | 2026-04-24 | 15:14:47       | 262.13      | 58.43        |
| P26         | sunfacing   | 2026-04-24 | 16:10:34       | 268.47      | 45.37        |
| P26         | sunoccluded | 2026-04-24 | 16:13:44       | 268.74      | 44.62        |
| P27         | sunfacing   | 2026-04-24 | 16:47:36       | 271.60      | 36.65        |
| P27         | sunoccluded | 2026-04-24 | 16:50:25       | 271.84      | 35.99        |
| P28         | sunfacing   | 2026-04-25 | 10:29:00       | 94.04       | 51.85        |
| P28         | sunoccluded | 2026-04-25 | 10:34:12       | 94.60       | 53.07        |
| P29         | sunfacing   | 2026-04-25 | 12:12:15       | 121.61      | 75.02        |
| P29         | sunoccluded | 2026-04-25 | 12:15:20       | 124.56      | 75.55        |
| P30         | sunfacing   | 2026-04-26 | 10:23:40       | 92.99       | 50.72        |
| P30         | sunoccluded | 2026-04-26 | 10:27:33       | 93.39       | 51.63        |
| P31         | sunfacing   | 2026-04-26 | 13:13:07       | 184.40      | 81.90        |
| P31         | sunoccluded | 2026-04-26 | 13:17:32       | 190.25      | 81.31        |
| P32         | sunfacing   | 2026-04-26 | 16:07:26       | 269.15      | 46.19        |
| P32         | sunoccluded | 2026-04-26 | 16:09:54       | 269.35      | 45.61        |
| P33         | sunfacing   | 2026-04-26 | 15:12:18       | 263.12      | 59.12        |
| P33         | sunoccluded | 2026-04-26 | 15:15:07       | 263.44      | 58.46        |
| P34         | sunfacing   | 2026-04-26 | 17:15:53       | 274.51      | 30.11        |
| P34         | sunoccluded | 2026-04-26 | 17:19:15       | 274.73      | 29.32        |
| P35         | sunfacing   | 2026-04-02 | 15:01:55       | 244.72      | 59.36        |
| P35         | sunoccluded | 2026-04-02 | 15:04:37       | 245.24      | 58.76        |

> **Interpolation note:** Values are linearly interpolated between the two surrounding
> whole hours. For sessions spanning a whole hour boundary (none in this dataset), the
> start-time value is used.

---

## 3. Licenses

### proj4js

Copyright (c) 2014, Mike Adair, Richard Greenwood, Didier Richard, Stephen Irons,
Olivier Terral and Calvin Metcalf

Authors:
- Mike Adair — madair AT dmsolutions.ca
- Richard Greenwood — rich AT greenwoodmap.com
- Didier Richard — didier.richard AT ign.fr
- Stephen Irons — stephen.irons AT clear.net.nz
- Olivier Terral — oterral AT gmail.com
- Calvin Metcalf — cmetcalf AT appgeo.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

Copyright (c) 2014, Vladimir Agafonkin

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of
   conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list
   of conditions and the following disclaimer in the documentation and/or other materials
   provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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