← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-11-20 Thu | 100 | 10 | 10 | 21:00–23:00 (marginal, 2.0 h) | 89.7° 21:05 | 11.1 | 0% | 134.7° |
| 2025-11-21 Fri | 100 | 0 | 0 | — | 89.7° 21:00 | 11.13 | 3% | 125.8° |
| 2025-11-22 Sat | 100 | 20 | 20 | 20:00–21:00 (good, 1.0 h) | 89.5° 20:55 | 11.15 | 6% | 116.1° |
| 2025-11-23 Sun | 100 | 99 | 99 | 18:35–03:00 (good, 8.42 h) | 89.6° 20:55 | 11.17 | 12% | 106.0° |
| 2025-11-24 Mon | 100 | 88 | 88 | 18:35–02:00 (good, 7.42 h) | 89.7° 20:50 | 11.2 | 18% | 95.5° |
| 2025-11-25 Tue | 100 | 0 | 0 | — | 89.7° 20:45 | 11.22 | 27% | 84.8° |
| 2025-11-26 Wed | 100 | 4 | 4 | 21:00–22:00 (marginal, 1.0 h) | 89.6° 20:40 | 11.24 | 36% | 74.0° |
| 2025-11-27 Thu | 100 | 0 | 0 | — | 89.5° 20:35 | 11.26 | 46% | 63.1° |
| 2025-11-28 Fri | 91 | 0 | 0 | — | 89.6° 20:35 | 11.28 | 57% | 52.5° |
| 2025-11-29 Sat | 83 | 0 | 0 | — | 89.7° 20:30 | 11.3 | 67% | 42.4° |
| 2025-11-30 Sun | 52 | 0 | 0 | — | 89.7° 20:25 | 11.32 | 78% | 34.2° |
| 2025-12-01 Mon | 34 | 87 | 30 | 18:35–02:00 (marginal, 7.42 h) | 89.6° 20:20 | 11.34 | 86% | 29.9° |
| 2025-12-02 Tue | 27 | 35 | 9 | 02:00–02:10 (marginal, 0.17 h) | 89.5° 20:20 | 11.35 | 94% | 31.9° |
| 2025-12-03 Wed | 31 | 11 | 3 | — | 89.7° 20:15 | 11.37 | 98% | 39.4° |
| 2025-12-04 Thu | 44 | 0 | 0 | — | 89.7° 20:10 | 11.38 | 100% | 50.1° |
| 2025-12-05 Fri | 65 | 0 | 0 | — | 89.7° 20:05 | 11.4 | 98% | 62.3° |
| 2025-12-06 Sat | 76 | 0 | 0 | — | 89.5° 20:00 | 11.41 | 94% | 74.9° |
| 2025-12-07 Sun | 100 | 3 | 3 | — | 89.6° 20:00 | 11.42 | 88% | 87.5° |
| 2025-12-08 Mon | 100 | 19 | 19 | 18:35–20:00 (good, 1.42 h) | 89.7° 19:55 | 11.44 | 79% | 99.8° |
| 2025-12-09 Tue | 100 | 11 | 11 | 23:00–01:00 (marginal, 2.0 h) | 89.7° 19:50 | 11.45 | 70% | 111.5° |
| 2025-12-10 Wed | 100 | 14 | 14 | 23:00–01:00 (marginal, 2.0 h) | 89.6° 19:45 | 11.46 | 60% | 122.4° |
| 2025-12-11 Thu | 100 | 53 | 53 | 18:35–22:00 (good, 3.42 h) | 89.5° 19:40 | 11.47 | 49% | 132.3° |
| 2025-12-12 Fri | 100 | 72 | 72 | 18:35–23:00 (good, 4.42 h) | 89.6° 19:40 | 11.47 | 40% | 140.8° |
| 2025-12-13 Sat | 100 | 21 | 21 | 18:35–19:00 (good, 0.42 h) | 89.7° 19:35 | 11.48 | 30% | 147.2° |
| 2025-12-14 Sun | 100 | 61 | 61 | 18:35–22:00 (good, 3.42 h) | 89.7° 19:30 | 11.49 | 22% | 150.2° |
| 2025-12-15 Mon | 100 | 100 | 100 | 18:35–01:35 (good, 7.0 h) | 89.6° 19:25 | 11.49 | 15% | 149.0° |
| 2025-12-16 Tue | 100 | 100 | 100 | 18:35–01:30 (good, 6.92 h) | 89.5° 19:25 | 11.5 | 9% | 144.1° |
| 2025-12-17 Wed | 100 | 68 | 68 | 18:35–23:00 (good, 4.42 h) | 89.6° 19:20 | 11.5 | 4% | 136.8° |
| 2025-12-18 Thu | 100 | 0 | 0 | — | 89.7° 19:15 | 11.5 | 1% | 128.1° |
| 2025-12-19 Fri | 100 | 95 | 95 | 18:35–01:05 (good, 6.5 h) | 89.7° 19:10 | 11.51 | 0% | 118.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-11-20&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.