← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-03-24 Mon | 44 | 0 | 0 | — | 87.3° 09:10 | 8.5 | 26% | 68.0° |
| 2025-03-25 Tue | 46 | 0 | 0 | — | 87.3° 09:05 | 8.45 | 17% | 63.3° |
| 2025-03-26 Wed | 48 | 0 | 0 | — | 87.3° 09:00 | 8.39 | 9% | 60.0° |
| 2025-03-27 Thu | 49 | 3 | 2 | — | 87.3° 08:55 | 8.34 | 3% | 58.7° |
| 2025-03-28 Fri | 49 | 0 | 0 | — | 87.3° 08:55 | 8.29 | 0% | 59.6° |
| 2025-03-29 Sat | 50 | 0 | 0 | — | 87.3° 09:50 | 8.23 | 0% | 62.9° |
| 2025-03-30 Sun | 51 | 0 | 0 | — | 87.3° 09:45 | 8.18 | 3% | 68.0° |
| 2025-03-31 Mon | 52 | 0 | 0 | — | 87.3° 09:40 | 8.12 | 9% | 74.4° |
| 2025-04-01 Tue | 53 | 0 | 0 | — | 87.3° 09:35 | 8.07 | 17% | 81.6° |
| 2025-04-02 Wed | 53 | 0 | 0 | — | 87.3° 09:35 | 8.01 | 27% | 89.0° |
| 2025-04-03 Thu | 54 | 0 | 0 | — | 87.3° 09:30 | 7.96 | 37% | 96.2° |
| 2025-04-04 Fri | 55 | 0 | 0 | — | 87.3° 09:25 | 7.9 | 48% | 103.0° |
| 2025-04-05 Sat | 54 | 79 | 43 | 04:00–05:20 (good, 1.33 h) | 87.3° 09:20 | 7.85 | 59% | 109.0° |
| 2025-04-06 Sun | 54 | 0 | 0 | — | 87.3° 09:20 | 7.79 | 69% | 114.1° |
| 2025-04-07 Mon | 54 | 5 | 3 | — | 87.3° 09:15 | 7.74 | 78% | 117.9° |
| 2025-04-08 Tue | 50 | 86 | 43 | 03:20–05:15 (good, 1.92 h) | 87.3° 09:10 | 7.68 | 85% | 120.4° |
| 2025-04-09 Wed | 50 | 93 | 47 | 03:25–05:15 (good, 1.83 h) | 87.3° 09:05 | 7.62 | 92% | 121.3° |
| 2025-04-10 Thu | 49 | 34 | 17 | 05:00–05:10 (good, 0.17 h) | 87.3° 09:00 | 7.57 | 96% | 120.7° |
| 2025-04-11 Fri | 49 | 3 | 1 | — | 87.3° 09:00 | 7.51 | 99% | 118.6° |
| 2025-04-12 Sat | 47 | 0 | 0 | — | 87.3° 08:55 | 7.45 | 100% | 115.3° |
| 2025-04-13 Sun | 45 | 0 | 0 | — | 87.3° 08:50 | 7.39 | 99% | 110.9° |
| 2025-04-14 Mon | 44 | 10 | 5 | 02:55–03:00 (marginal, 0.08 h) | 87.3° 08:45 | 7.34 | 97% | 105.7° |
| 2025-04-15 Tue | 42 | 79 | 33 | 02:05–05:00 (marginal, 2.92 h) | 87.3° 08:40 | 7.28 | 92% | 100.0° |
| 2025-04-16 Wed | 42 | 96 | 40 | 03:00–05:00 (good, 2.0 h) | 87.3° 08:40 | 7.22 | 87% | 94.0° |
| 2025-04-17 Thu | 43 | 0 | 0 | — | 87.3° 08:35 | 7.16 | 79% | 87.7° |
| 2025-04-18 Fri | 45 | 0 | 0 | — | 87.3° 08:30 | 7.11 | 71% | 81.5° |
| 2025-04-19 Sat | 50 | 42 | 21 | 02:25–02:45 (good, 0.33 h) | 87.3° 08:25 | 7.05 | 62% | 75.4° |
| 2025-04-20 Sun | 56 | 83 | 46 | 03:00–04:50 (good, 1.83 h) | 87.3° 08:25 | 6.99 | 52% | 69.7° |
| 2025-04-21 Mon | 63 | 75 | 47 | 03:00–04:00 (good, 1.0 h) | 87.3° 08:20 | 6.93 | 41% | 64.8° |
| 2025-04-22 Tue | 68 | 58 | 39 | 04:00–04:50 (good, 0.83 h) | 87.3° 08:15 | 6.87 | 30% | 61.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-03-24&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.