← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-04-20 Sun | 49 | 84 | 41 | 03:00–04:50 (good, 1.83 h) | 71.1° 07:25 | 6.99 | 52% | 47.4° |
| 2025-04-21 Mon | 56 | 79 | 45 | 03:00–04:00 (good, 1.0 h) | 71.1° 07:20 | 6.93 | 41% | 46.0° |
| 2025-04-22 Tue | 61 | 59 | 36 | 04:00–04:50 (good, 0.83 h) | 71.1° 07:15 | 6.87 | 30% | 47.5° |
| 2025-04-23 Wed | 66 | 74 | 49 | 03:00–04:00 (good, 1.0 h) | 71.1° 07:15 | 6.81 | 21% | 52.0° |
| 2025-04-24 Thu | 69 | 92 | 63 | 02:15–04:45 (good, 2.5 h) | 71.1° 07:10 | 6.76 | 12% | 59.0° |
| 2025-04-25 Fri | 68 | 100 | 68 | 02:05–04:40 (good, 2.58 h) | 71.1° 07:05 | 6.7 | 5% | 67.8° |
| 2025-04-26 Sat | 70 | 47 | 33 | 02:00–04:40 (marginal, 2.67 h) | 71.1° 07:00 | 6.64 | 1% | 77.7° |
| 2025-04-27 Sun | 72 | 0 | 0 | — | 71.1° 06:55 | 6.58 | 0% | 88.2° |
| 2025-04-28 Mon | 72 | 100 | 72 | 01:50–04:35 (good, 2.75 h) | 71.1° 06:55 | 6.52 | 2% | 98.8° |
| 2025-04-29 Tue | 73 | 100 | 73 | 01:50–04:35 (good, 2.75 h) | 71.1° 06:50 | 6.47 | 7% | 108.9° |
| 2025-04-30 Wed | 75 | 87 | 65 | 02:05–04:35 (good, 2.5 h) | 71.1° 06:45 | 6.41 | 14% | 117.9° |
| 2025-05-01 Thu | 75 | 30 | 23 | 03:00–04:30 (marginal, 1.5 h) | 71.1° 06:40 | 6.35 | 23% | 125.5° |
| 2025-05-02 Fri | 76 | 99 | 76 | 01:40–04:30 (good, 2.83 h) | 71.1° 06:40 | 6.29 | 33% | 130.9° |
| 2025-05-03 Sat | 76 | 100 | 76 | 01:35–04:25 (good, 2.83 h) | 71.1° 06:35 | 6.23 | 43% | 133.8° |
| 2025-05-04 Sun | 77 | 9 | 7 | 05:00–05:05 (marginal, 0.08 h) | 71.1° 06:30 | 6.18 | 54% | 133.8° |
| 2025-05-05 Mon | 78 | 74 | 58 | 04:00–04:25 (good, 0.42 h) | 71.1° 06:25 | 6.12 | 64% | 131.2° |
| 2025-05-06 Tue | 76 | 0 | 0 | — | 71.1° 06:20 | 6.06 | 73% | 126.5° |
| 2025-05-07 Wed | 76 | 71 | 54 | 01:30–04:00 (good, 2.5 h) | 71.1° 06:20 | 6.0 | 81% | 120.4° |
| 2025-05-08 Thu | 68 | 72 | 49 | 01:25–04:00 (good, 2.58 h) | 71.1° 06:15 | 5.95 | 88% | 113.3° |
| 2025-05-09 Fri | 62 | 0 | 0 | — | 71.1° 06:10 | 5.89 | 93% | 105.6° |
| 2025-05-10 Sat | 56 | 0 | 0 | — | 71.1° 06:05 | 5.84 | 97% | 97.6° |
| 2025-05-11 Sun | 51 | 0 | 0 | — | 71.1° 06:00 | 5.78 | 99% | 89.4° |
| 2025-05-12 Mon | 45 | 0 | 0 | — | 71.1° 06:00 | 5.73 | 100% | 81.1° |
| 2025-05-13 Tue | 42 | 0 | 0 | — | 71.1° 05:55 | 5.67 | 98% | 73.1° |
| 2025-05-14 Wed | 40 | 100 | 40 | 02:55–04:10 (good, 1.25 h) | 71.1° 05:50 | 5.62 | 95% | 65.3° |
| 2025-05-15 Thu | 38 | 0 | 0 | — | 71.1° 05:45 | 5.56 | 90% | 58.3° |
| 2025-05-16 Fri | 41 | 0 | 0 | — | 71.1° 05:45 | 5.51 | 84% | 52.3° |
| 2025-05-17 Sat | 58 | 16 | 9 | 00:15–01:00 (marginal, 0.75 h) | 71.1° 05:40 | 5.46 | 76% | 47.9° |
| 2025-05-18 Sun | 67 | 100 | 67 | 00:35–04:00 (good, 3.42 h) | 71.1° 05:35 | 5.41 | 66% | 45.9° |
| 2025-05-19 Mon | 76 | 96 | 73 | 00:40–04:00 (good, 3.33 h) | 71.1° 05:30 | 5.36 | 56% | 46.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-04-20&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.