← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-12-15 Mon | 100 | 100 | 100 | 18:35–03:40 (good, 9.08 h) | 72.5° 22:30 | 11.49 | 15% | 159.4° |
| 2025-12-16 Tue | 100 | 92 | 92 | 18:35–02:25 (good, 7.83 h) | 72.5° 22:25 | 11.5 | 9% | 171.2° |
| 2025-12-17 Wed | 100 | 67 | 67 | 18:35–23:00 (good, 4.42 h) | 72.5° 22:20 | 11.5 | 4% | 176.9° |
| 2025-12-18 Thu | 100 | 0 | 0 | — | 72.5° 22:20 | 11.5 | 1% | 165.1° |
| 2025-12-19 Fri | 100 | 92 | 92 | 18:35–03:00 (good, 8.42 h) | 72.5° 22:15 | 11.51 | 0% | 153.1° |
| 2025-12-20 Sat | 100 | 7 | 7 | 18:35–19:00 (good, 0.42 h) | 72.5° 22:10 | 11.51 | 1% | 141.1° |
| 2025-12-21 Sun | 100 | 0 | 0 | — | 72.5° 22:05 | 11.51 | 3% | 128.9° |
| 2025-12-22 Mon | 100 | 14 | 14 | 18:35–20:00 (good, 1.42 h) | 72.5° 22:00 | 11.51 | 8% | 116.6° |
| 2025-12-23 Tue | 100 | 1 | 1 | — | 72.5° 22:00 | 11.51 | 14% | 104.0° |
| 2025-12-24 Wed | 100 | 0 | 0 | — | 72.5° 21:55 | 11.5 | 21% | 91.3° |
| 2025-12-25 Thu | 100 | 0 | 0 | — | 72.5° 21:50 | 11.5 | 30% | 78.4° |
| 2025-12-26 Fri | 100 | 32 | 32 | 21:00–22:00 (good, 1.0 h) | 72.5° 21:45 | 11.5 | 41% | 65.2° |
| 2025-12-27 Sat | 93 | 100 | 93 | 18:40–02:55 (good, 8.25 h) | 72.5° 21:45 | 11.49 | 51% | 51.6° |
| 2025-12-28 Sun | 84 | 73 | 61 | 00:00–02:50 (good, 2.83 h) | 72.5° 21:40 | 11.48 | 62% | 37.7° |
| 2025-12-29 Mon | 54 | 100 | 54 | 18:40–03:15 (marginal, 8.58 h) | 72.5° 21:35 | 11.48 | 73% | 23.5° |
| 2025-12-30 Tue | 37 | 16 | 6 | 18:40–20:00 (marginal, 1.33 h) | 72.5° 21:30 | 11.47 | 83% | 8.9° |
| 2025-12-31 Wed | 23 | 50 | 11 | 01:00–02:00 (marginal, 1.0 h) | 72.5° 21:25 | 11.46 | 91% | 6.0° |
| 2026-01-01 Thu | 20 | 100 | 20 | 18:45–20:05 (marginal, 1.33 h) | 72.5° 21:25 | 11.45 | 97% | 21.0° |
| 2026-01-02 Fri | 26 | 80 | 21 | 18:45–21:00 (marginal, 2.25 h) | 72.5° 21:20 | 11.44 | 100% | 35.9° |
| 2026-01-03 Sat | 49 | 0 | 0 | — | 72.5° 21:15 | 11.43 | 100% | 50.8° |
| 2026-01-04 Sun | 69 | 0 | 0 | — | 72.5° 21:10 | 11.42 | 97% | 65.3° |
| 2026-01-05 Mon | 100 | 6 | 6 | — | 72.5° 21:05 | 11.4 | 92% | 79.5° |
| 2026-01-06 Tue | 100 | 0 | 0 | — | 72.5° 21:05 | 11.39 | 84% | 93.3° |
| 2026-01-07 Wed | 100 | 0 | 0 | — | 72.5° 21:00 | 11.37 | 76% | 106.6° |
| 2026-01-08 Thu | 100 | 53 | 53 | 23:00–01:55 (good, 2.92 h) | 72.5° 20:55 | 11.36 | 67% | 119.4° |
| 2026-01-09 Fri | 100 | 44 | 44 | 21:00–23:05 (good, 2.08 h) | 72.5° 20:50 | 11.34 | 57% | 131.9° |
| 2026-01-10 Sat | 100 | 36 | 36 | 21:00–23:00 (good, 2.0 h) | 72.5° 20:50 | 11.32 | 47% | 144.1° |
| 2026-01-11 Sun | 100 | 0 | 0 | — | 72.5° 20:45 | 11.31 | 38% | 156.1° |
| 2026-01-12 Mon | 100 | 97 | 97 | 19:00–01:50 (good, 6.83 h) | 72.5° 20:40 | 11.29 | 29% | 167.9° |
| 2026-01-13 Tue | 100 | 12 | 12 | 23:00–00:00 (marginal, 1.0 h) | 72.5° 20:35 | 11.27 | 21% | 179.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-12-15&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.