← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-12-18 Thu | 69 | 17 | 12 | 05:00–06:00 (marginal, 1.0 h) | 50.2° 07:00 | 11.5 | 1% | 69.4° |
| 2025-12-19 Fri | 71 | 24 | 17 | 03:20–04:00 (marginal, 0.67 h) | 50.2° 06:55 | 11.51 | 0% | 81.3° |
| 2025-12-20 Sat | 72 | 0 | 0 | — | 50.2° 06:50 | 11.51 | 1% | 93.3° |
| 2025-12-21 Sun | 74 | 0 | 0 | — | 50.2° 06:45 | 11.51 | 3% | 105.4° |
| 2025-12-22 Mon | 76 | 0 | 0 | — | 50.2° 06:45 | 11.51 | 8% | 117.6° |
| 2025-12-23 Tue | 78 | 0 | 0 | — | 50.2° 06:40 | 11.51 | 14% | 130.0° |
| 2025-12-24 Wed | 79 | 0 | 0 | — | 50.2° 06:35 | 11.5 | 21% | 142.5° |
| 2025-12-25 Thu | 82 | 4 | 3 | — | 50.2° 06:30 | 11.5 | 30% | 155.1° |
| 2025-12-26 Fri | 83 | 13 | 11 | 04:55–05:00 (marginal, 0.08 h) | 50.2° 06:30 | 11.5 | 41% | 167.2° |
| 2025-12-27 Sat | 85 | 100 | 85 | 02:35–06:10 (good, 3.58 h) | 50.2° 06:25 | 11.49 | 51% | 172.6° |
| 2025-12-28 Sun | 86 | 99 | 85 | 02:35–06:10 (good, 3.58 h) | 50.2° 06:20 | 11.48 | 62% | 162.0° |
| 2025-12-29 Mon | 87 | 100 | 87 | 02:35–06:10 (good, 3.58 h) | 50.2° 06:15 | 11.48 | 73% | 148.4° |
| 2025-12-30 Tue | 86 | 37 | 32 | 05:00–06:10 (good, 1.17 h) | 50.2° 06:10 | 11.47 | 83% | 134.1° |
| 2025-12-31 Wed | 83 | 35 | 29 | 02:20–04:00 (marginal, 1.67 h) | 50.2° 06:10 | 11.46 | 91% | 119.4° |
| 2026-01-01 Thu | 64 | 88 | 56 | 02:40–05:00 (good, 2.33 h) | 50.2° 06:05 | 11.45 | 97% | 104.6° |
| 2026-01-02 Fri | 50 | 14 | 7 | 02:15–03:00 (marginal, 0.75 h) | 50.2° 06:00 | 11.44 | 100% | 89.7° |
| 2026-01-03 Sat | 37 | 10 | 4 | 06:00–06:10 (marginal, 0.17 h) | 50.2° 05:55 | 11.43 | 100% | 75.0° |
| 2026-01-04 Sun | 27 | 0 | 0 | — | 50.2° 05:50 | 11.42 | 97% | 60.5° |
| 2026-01-05 Mon | 20 | 9 | 2 | — | 50.2° 05:50 | 11.4 | 92% | 46.5° |
| 2026-01-06 Tue | 18 | 7 | 1 | — | 50.2° 05:45 | 11.39 | 84% | 33.0° |
| 2026-01-07 Wed | 23 | 0 | 0 | — | 50.2° 05:40 | 11.37 | 76% | 20.2° |
| 2026-01-08 Thu | 32 | 99 | 32 | 01:35–06:10 (marginal, 4.58 h) | 50.2° 05:35 | 11.36 | 67% | 9.3° |
| 2026-01-09 Fri | 43 | 12 | 5 | — | 50.2° 05:35 | 11.34 | 57% | 9.4° |
| 2026-01-10 Sat | 55 | 19 | 10 | 02:00–03:00 (marginal, 1.0 h) | 50.2° 05:30 | 11.32 | 47% | 19.7° |
| 2026-01-11 Sun | 77 | 0 | 0 | — | 50.2° 05:25 | 11.31 | 38% | 31.2° |
| 2026-01-12 Mon | 88 | 99 | 87 | 01:35–06:10 (good, 4.58 h) | 50.2° 05:20 | 11.29 | 29% | 42.8° |
| 2026-01-13 Tue | 92 | 13 | 12 | 01:40–02:00 (marginal, 0.33 h) | 50.2° 05:15 | 11.27 | 21% | 54.4° |
| 2026-01-14 Wed | 93 | 100 | 93 | 01:25–06:10 (good, 4.75 h) | 50.2° 05:15 | 11.25 | 14% | 66.1° |
| 2026-01-15 Thu | 93 | 79 | 74 | 01:25–05:00 (good, 3.58 h) | 50.2° 05:10 | 11.23 | 8% | 78.0° |
| 2026-01-16 Fri | 93 | 0 | 0 | — | 50.2° 05:05 | 11.2 | 4% | 89.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-12-18&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.