← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-12-19 Fri | 82 | 94 | 77 | 18:35–21:40 (good, 3.08 h) | 87.3° 15:25 | 11.51 | 0% | 84.9° |
| 2025-12-20 Sat | 81 | 21 | 17 | 18:35–19:00 (good, 0.42 h) | 87.3° 15:25 | 11.51 | 1% | 78.6° |
| 2025-12-21 Sun | 78 | 1 | 1 | — | 87.3° 15:20 | 11.51 | 3% | 72.6° |
| 2025-12-22 Mon | 74 | 37 | 28 | 18:35–20:00 (good, 1.42 h) | 87.3° 15:15 | 11.51 | 8% | 67.1° |
| 2025-12-23 Tue | 67 | 4 | 3 | — | 87.3° 15:10 | 11.51 | 14% | 62.5° |
| 2025-12-24 Wed | 60 | 0 | 0 | — | 87.3° 15:10 | 11.5 | 21% | 59.2° |
| 2025-12-25 Thu | 52 | 0 | 0 | — | 87.3° 15:05 | 11.5 | 30% | 57.4° |
| 2025-12-26 Fri | 43 | 66 | 28 | 18:40–20:00 (marginal, 1.33 h) | 87.3° 15:00 | 11.5 | 41% | 57.5° |
| 2025-12-27 Sat | 35 | 100 | 35 | 18:40–20:45 (good, 2.08 h) | 87.3° 14:55 | 11.49 | 51% | 59.6° |
| 2025-12-28 Sun | 29 | 61 | 18 | 19:00–21:20 (marginal, 2.33 h) | 87.3° 14:50 | 11.48 | 62% | 63.6° |
| 2025-12-29 Mon | 25 | 100 | 25 | 18:40–21:30 (marginal, 2.83 h) | 87.3° 14:50 | 11.48 | 73% | 69.2° |
| 2025-12-30 Tue | 24 | 53 | 13 | 18:40–20:00 (marginal, 1.33 h) | 87.3° 14:45 | 11.47 | 83% | 76.1° |
| 2025-12-31 Wed | 24 | 60 | 14 | 18:45–20:00 (marginal, 1.25 h) | 87.3° 14:40 | 11.46 | 91% | 83.8° |
| 2026-01-01 Thu | 27 | 100 | 27 | 18:45–19:25 (good, 0.67 h) | 87.3° 14:35 | 11.45 | 97% | 91.8° |
| 2026-01-02 Fri | 31 | 92 | 29 | 18:45–19:40 (good, 0.92 h) | 87.3° 14:30 | 11.44 | 100% | 99.8° |
| 2026-01-03 Sat | 36 | 0 | 0 | — | 87.3° 14:30 | 11.43 | 100% | 107.3° |
| 2026-01-04 Sun | 39 | 0 | 0 | — | 87.3° 14:25 | 11.42 | 97% | 113.7° |
| 2026-01-05 Mon | 45 | 0 | 0 | — | 87.3° 14:20 | 11.4 | 92% | 118.6° |
| 2026-01-06 Tue | 44 | 0 | 0 | — | 87.3° 14:15 | 11.39 | 84% | 121.7° |
| 2026-01-07 Wed | 43 | 0 | 0 | — | 87.3° 14:15 | 11.37 | 76% | 122.8° |
| 2026-01-08 Thu | 42 | 13 | 5 | 20:00–20:05 (marginal, 0.08 h) | 87.3° 14:10 | 11.36 | 67% | 122.1° |
| 2026-01-09 Fri | 41 | 39 | 16 | 18:50–19:00 (good, 0.17 h) | 87.3° 14:05 | 11.34 | 57% | 119.6° |
| 2026-01-10 Sat | 38 | 0 | 0 | — | 87.3° 14:00 | 11.32 | 47% | 115.9° |
| 2026-01-11 Sun | 37 | 0 | 0 | — | 87.3° 13:55 | 11.31 | 38% | 111.1° |
| 2026-01-12 Mon | 35 | 88 | 31 | 19:00–20:15 (good, 1.25 h) | 87.3° 13:55 | 11.29 | 29% | 105.6° |
| 2026-01-13 Tue | 34 | 0 | 0 | — | 87.3° 13:50 | 11.27 | 21% | 99.6° |
| 2026-01-14 Wed | 32 | 98 | 31 | 18:55–20:05 (good, 1.17 h) | 87.3° 13:45 | 11.25 | 14% | 93.3° |
| 2026-01-15 Thu | 30 | 100 | 30 | 18:55–20:00 (good, 1.08 h) | 87.3° 13:40 | 11.23 | 8% | 86.8° |
| 2026-01-16 Fri | 29 | 0 | 0 | — | 87.3° 13:35 | 11.2 | 4% | 80.4° |
| 2026-01-17 Sat | 27 | 85 | 23 | 19:00–19:40 (good, 0.67 h) | 87.3° 13:35 | 11.18 | 1% | 74.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-12-19&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.