← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-12-11 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° |
| 2025-12-20 Sat | 100 | 10 | 10 | 18:35–19:00 (good, 0.42 h) | 89.5° 19:05 | 11.51 | 1% | 108.4° |
| 2025-12-21 Sun | 100 | 0 | 0 | — | 89.6° 19:05 | 11.51 | 3% | 97.9° |
| 2025-12-22 Mon | 100 | 19 | 19 | 18:35–20:00 (good, 1.42 h) | 89.7° 19:00 | 11.51 | 8% | 87.1° |
| 2025-12-23 Tue | 100 | 2 | 2 | — | 89.7° 18:55 | 11.51 | 14% | 76.3° |
| 2025-12-24 Wed | 100 | 0 | 0 | — | 89.6° 18:50 | 11.5 | 21% | 65.5° |
| 2025-12-25 Thu | 94 | 0 | 0 | — | 89.5° 18:45 | 11.5 | 30% | 54.8° |
| 2025-12-26 Fri | 85 | 36 | 31 | 18:40–20:00 (marginal, 1.33 h) | 89.6° 18:45 | 11.5 | 41% | 44.8° |
| 2025-12-27 Sat | 70 | 100 | 70 | 18:40–00:25 (good, 5.75 h) | 89.7° 18:40 | 11.49 | 51% | 36.1° |
| 2025-12-28 Sun | 53 | 63 | 33 | 19:00–22:00 (marginal, 3.0 h) | 89.7° 18:35 | 11.48 | 62% | 30.5° |
| 2025-12-29 Mon | 34 | 100 | 34 | 18:40–00:55 (marginal, 6.25 h) | 89.6° 18:30 | 11.48 | 73% | 30.2° |
| 2025-12-30 Tue | 27 | 25 | 7 | 18:40–20:00 (marginal, 1.33 h) | 89.5° 18:30 | 11.47 | 83% | 35.7° |
| 2025-12-31 Wed | 27 | 40 | 11 | 18:45–20:00 (marginal, 1.25 h) | 89.6° 18:25 | 11.46 | 91% | 45.2° |
| 2026-01-01 Thu | 34 | 100 | 34 | 18:45–00:15 (marginal, 5.5 h) | 89.7° 18:20 | 11.45 | 97% | 56.7° |
| 2026-01-02 Fri | 49 | 83 | 41 | 18:45–23:00 (marginal, 4.25 h) | 89.7° 18:15 | 11.44 | 100% | 69.1° |
| 2026-01-03 Sat | 68 | 0 | 0 | — | 89.5° 18:10 | 11.43 | 100% | 81.9° |
| 2026-01-04 Sun | 82 | 0 | 0 | — | 89.5° 18:10 | 11.42 | 97% | 94.5° |
| 2026-01-05 Mon | 100 | 0 | 0 | — | 89.7° 18:05 | 11.4 | 92% | 106.8° |
| 2026-01-06 Tue | 100 | 0 | 0 | — | 89.7° 18:00 | 11.39 | 84% | 118.4° |
| 2026-01-07 Wed | 100 | 0 | 0 | — | 89.6° 17:55 | 11.37 | 76% | 129.1° |
| 2026-01-08 Thu | 100 | 39 | 39 | 23:00–23:45 (good, 0.75 h) | 89.5° 17:50 | 11.36 | 67% | 138.4° |
| 2026-01-09 Fri | 100 | 53 | 53 | 21:00–22:55 (good, 1.92 h) | 89.6° 17:50 | 11.34 | 57% | 145.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-12-11&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.