← single night · whole-night plan
Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.
| night of | astronomy | weather | overall | best window | highest | dark h | Moon | Moon sep. |
|---|---|---|---|---|---|---|---|---|
| 2041-04-25 Thu | 73 | — | unknown | 01:50–04:40 (good, 2.83 h) | 87.3° 08:05 | 6.69 | 26% | 62.5° |
| 2041-04-26 Fri | 75 | — | unknown | 01:45–04:40 (good, 2.92 h) | 87.3° 08:00 | 6.63 | 16% | 62.3° |
| 2041-04-27 Sat | 78 | — | unknown | 01:40–04:40 (good, 3.0 h) | 87.3° 07:55 | 6.57 | 8% | 64.1° |
| 2041-04-28 Sun | 78 | — | unknown | 01:35–04:35 (good, 3.0 h) | 87.3° 07:50 | 6.52 | 3% | 67.5° |
| 2041-04-29 Mon | 79 | — | unknown | 01:30–04:35 (good, 3.08 h) | 87.2° 07:45 | 6.46 | 0% | 72.2° |
| 2041-04-30 Tue | 79 | — | unknown | 01:30–04:30 (good, 3.0 h) | 87.3° 07:45 | 6.4 | 0% | 77.8° |
| 2041-05-01 Wed | 81 | — | unknown | 01:25–04:30 (good, 3.08 h) | 87.3° 07:40 | 6.34 | 2% | 83.8° |
| 2041-05-02 Thu | 83 | — | unknown | 01:20–04:30 (good, 3.17 h) | 87.3° 07:35 | 6.28 | 7% | 90.0° |
| 2041-05-03 Fri | 83 | — | unknown | 01:15–04:25 (good, 3.17 h) | 87.3° 07:30 | 6.23 | 13% | 96.0° |
| 2041-05-04 Sat | 84 | — | unknown | 01:15–04:25 (good, 3.17 h) | 87.2° 07:30 | 6.17 | 21% | 101.6° |
| 2041-05-05 Sun | 85 | — | unknown | 01:15–04:25 (good, 3.17 h) | 87.3° 07:25 | 6.11 | 29% | 106.6° |
| 2041-05-06 Mon | 85 | — | unknown | 01:10–04:20 (good, 3.17 h) | 87.3° 07:20 | 6.05 | 38% | 110.9° |
| 2041-05-07 Tue | 85 | — | unknown | 01:10–04:20 (good, 3.17 h) | 87.3° 07:15 | 6.0 | 48% | 114.3° |
| 2041-05-08 Wed | 86 | — | unknown | 01:05–04:20 (good, 3.25 h) | 87.2° 07:10 | 5.94 | 57% | 116.6° |
| 2041-05-09 Thu | 85 | — | unknown | 01:05–04:15 (good, 3.17 h) | 87.2° 07:10 | 5.89 | 66% | 117.7° |
| 2041-05-10 Fri | 85 | — | unknown | 01:00–04:15 (good, 3.25 h) | 87.3° 07:05 | 5.83 | 75% | 117.6° |
| 2041-05-11 Sat | 77 | — | unknown | 01:00–04:15 (good, 3.25 h) | 87.3° 07:00 | 5.77 | 83% | 116.1° |
| 2041-05-12 Sun | 74 | — | unknown | 01:00–04:10 (good, 3.17 h) | 87.3° 06:55 | 5.72 | 90% | 113.4° |
| 2041-05-13 Mon | 71 | — | unknown | 01:00–04:10 (good, 3.17 h) | 87.2° 06:50 | 5.67 | 95% | 109.4° |
| 2041-05-14 Tue | 66 | — | unknown | 01:00–04:10 (good, 3.17 h) | 87.3° 06:50 | 5.61 | 99% | 104.5° |
| 2041-05-15 Wed | 61 | — | unknown | 01:00–04:05 (good, 3.08 h) | 87.3° 06:45 | 5.56 | 100% | 98.9° |
| 2041-05-16 Thu | 58 | — | unknown | 00:55–04:05 (good, 3.17 h) | 87.3° 06:40 | 5.51 | 99% | 92.7° |
| 2041-05-17 Fri | 56 | — | unknown | 00:55–04:05 (good, 3.17 h) | 87.3° 06:35 | 5.45 | 96% | 86.3° |
| 2041-05-18 Sat | 55 | — | unknown | 00:45–04:00 (good, 3.25 h) | 87.2° 06:35 | 5.4 | 90% | 79.9° |
| 2041-05-19 Sun | 65 | — | unknown | 00:15–04:00 (good, 3.75 h) | 87.3° 06:30 | 5.35 | 82% | 74.0° |
| 2041-05-20 Mon | 76 | — | unknown | 00:10–04:00 (good, 3.83 h) | 87.3° 06:25 | 5.3 | 72% | 69.0° |
| 2041-05-21 Tue | 85 | — | unknown | 00:05–04:00 (good, 3.92 h) | 87.3° 06:20 | 5.25 | 62% | 65.1° |
| 2041-05-22 Wed | 94 | — | unknown | 00:00–03:55 (good, 3.92 h) | 87.2° 06:15 | 5.2 | 50% | 62.7° |
| 2041-05-23 Thu | 98 | — | unknown | 00:00–03:55 (good, 3.92 h) | 87.2° 06:15 | 5.16 | 39% | 62.2° |
| 2041-05-24 Fri | 100 | — | unknown | 23:55–03:55 (good, 4.0 h) | 87.3° 06:10 | 5.11 | 28% | 63.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-04-25&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csvOne row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.