← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-12-17 Wed | 31 | 95 | 29 | 18:35–19:45 (good, 1.17 h) | 71.1° 14:35 | 11.5 | 4% | 75.9° |
| 2025-12-18 Thu | 29 | 0 | 0 | — | 71.1° 14:35 | 11.5 | 1% | 68.0° |
| 2025-12-19 Fri | 28 | 94 | 26 | 18:35–19:30 (good, 0.92 h) | 71.1° 14:30 | 11.51 | 0% | 60.6° |
| 2025-12-20 Sat | 27 | 47 | 13 | 18:35–19:00 (good, 0.42 h) | 71.1° 14:25 | 11.51 | 1% | 54.0° |
| 2025-12-21 Sun | 25 | 2 | 1 | — | 71.1° 14:20 | 11.51 | 3% | 48.8° |
| 2025-12-22 Mon | 22 | 74 | 16 | 18:35–19:00 (good, 0.42 h) | 71.1° 14:20 | 11.51 | 8% | 45.5° |
| 2025-12-23 Tue | 18 | 10 | 2 | — | 71.1° 14:15 | 11.51 | 14% | 44.8° |
| 2025-12-24 Wed | 16 | 0 | 0 | — | 71.1° 14:10 | 11.5 | 21% | 46.8° |
| 2025-12-25 Thu | 14 | 0 | 0 | — | 71.1° 14:05 | 11.5 | 30% | 51.4° |
| 2025-12-26 Fri | 11 | 79 | 9 | 18:40–19:25 (marginal, 0.75 h) | 71.1° 14:00 | 11.5 | 41% | 58.0° |
| 2025-12-27 Sat | 9 | 100 | 9 | 18:05–19:30 (marginal, 1.42 h) | 71.1° 14:00 | 11.49 | 51% | 66.1° |
| 2025-12-28 Sun | 7 | 19 | 1 | — | 71.1° 13:55 | 11.48 | 62% | 75.4° |
| 2025-12-29 Mon | 6 | 100 | 6 | 18:40–19:20 (marginal, 0.67 h) | 71.1° 13:50 | 11.48 | 73% | 85.3° |
| 2025-12-30 Tue | 6 | 94 | 6 | 18:40–19:10 (marginal, 0.5 h) | 71.1° 13:45 | 11.47 | 83% | 95.7° |
| 2025-12-31 Wed | 5 | 91 | 5 | 18:45–19:00 (marginal, 0.25 h) | 71.1° 13:40 | 11.46 | 91% | 106.0° |
| 2026-01-01 Thu | 5 | 98 | 5 | 18:45–19:10 (marginal, 0.42 h) | 71.1° 13:40 | 11.45 | 97% | 115.8° |
| 2026-01-02 Fri | 5 | 88 | 4 | 18:45–19:10 (marginal, 0.42 h) | 71.1° 13:35 | 11.44 | 100% | 124.5° |
| 2026-01-03 Sat | 4 | 0 | 0 | — | 71.1° 13:30 | 11.43 | 100% | 131.1° |
| 2026-01-04 Sun | 4 | 0 | 0 | — | 71.1° 13:25 | 11.42 | 97% | 134.8° |
| 2026-01-05 Mon | 3 | 0 | 0 | — | 71.1° 13:25 | 11.4 | 92% | 134.9° |
| 2026-01-06 Tue | 2 | 0 | 0 | — | 71.1° 13:20 | 11.39 | 84% | 131.9° |
| 2026-01-07 Wed | 2 | 0 | 0 | — | 71.1° 13:15 | 11.37 | 76% | 126.4° |
| 2026-01-08 Thu | 1 | 0 | 0 | — | 71.1° 13:10 | 11.36 | 67% | 119.4° |
| 2026-01-09 Fri | 1 | 84 | 1 | — | 71.1° 13:05 | 11.34 | 57% | 111.7° |
| 2026-01-10 Sat | 1 | 0 | 0 | — | 71.1° 13:05 | 11.32 | 47% | 103.4° |
| 2026-01-11 Sun | 1 | 0 | 0 | — | 71.1° 13:00 | 11.31 | 38% | 95.0° |
| 2026-01-12 Mon | 0 | 64 | 0 | — | 71.1° 12:55 | 11.29 | 29% | 86.6° |
| 2026-01-13 Tue | 0 | 0 | 0 | — | 71.1° 12:50 | 11.27 | 21% | 78.3° |
| 2026-01-14 Wed | 0 | 96 | 0 | — | 71.1° 12:45 | 11.25 | 14% | 70.3° |
| 2026-01-15 Thu | 0 | 97 | 0 | — | 71.1° 12:45 | 11.23 | 8% | 62.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-12-17&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.