← 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 | 22 | 90 | 20 | 18:35–19:15 (good, 0.67 h) | 87.1° 13:15 | 11.5 | 4% | 74.2° |
| 2025-12-18 Thu | 20 | 1 | 0 | — | 87.1° 13:10 | 11.5 | 1% | 70.8° |
| 2025-12-19 Fri | 19 | 88 | 17 | 18:35–19:00 (good, 0.42 h) | 87.1° 13:05 | 11.51 | 0% | 68.1° |
| 2025-12-20 Sat | 18 | 56 | 10 | 18:35–18:50 (good, 0.25 h) | 87.1° 13:00 | 11.51 | 1% | 66.4° |
| 2025-12-21 Sun | 16 | 3 | 0 | — | 87.1° 13:00 | 11.51 | 3% | 65.8° |
| 2025-12-22 Mon | 14 | 65 | 9 | 18:35–19:20 (marginal, 0.75 h) | 87.1° 12:55 | 11.51 | 8% | 66.3° |
| 2025-12-23 Tue | 12 | 11 | 1 | — | 87.1° 12:50 | 11.51 | 14% | 68.0° |
| 2025-12-24 Wed | 10 | 0 | 0 | — | 87.1° 12:45 | 11.5 | 21% | 70.9° |
| 2025-12-25 Thu | 9 | 7 | 1 | — | 87.1° 12:40 | 11.5 | 30% | 74.7° |
| 2025-12-26 Fri | 8 | 54 | 4 | 18:40–19:00 (marginal, 0.33 h) | 87.1° 12:40 | 11.5 | 41% | 79.3° |
| 2025-12-27 Sat | 7 | 100 | 7 | 18:40–19:05 (marginal, 0.42 h) | 87.1° 12:35 | 11.49 | 51% | 84.5° |
| 2025-12-28 Sun | 7 | 48 | 3 | 06:30–06:45 (marginal, 0.25 h) | 87.1° 12:30 | 11.48 | 62% | 90.2° |
| 2025-12-29 Mon | 7 | 100 | 7 | 05:55–06:10 (marginal, 0.25 h) | 87.1° 12:25 | 11.48 | 73% | 96.0° |
| 2025-12-30 Tue | 8 | 97 | 8 | 05:50–06:10 (marginal, 0.33 h) | 87.1° 12:20 | 11.47 | 83% | 101.6° |
| 2025-12-31 Wed | 8 | 57 | 5 | 18:45–18:50 (marginal, 0.08 h) | 87.1° 12:20 | 11.46 | 91% | 106.6° |
| 2026-01-01 Thu | 7 | 77 | 5 | 06:05–06:10 (marginal, 0.08 h) | 87.1° 12:15 | 11.45 | 97% | 110.6° |
| 2026-01-02 Fri | 8 | 22 | 2 | — | 87.1° 12:10 | 11.44 | 100% | 113.3° |
| 2026-01-03 Sat | 8 | 35 | 3 | 06:00–06:10 (marginal, 0.17 h) | 87.1° 12:05 | 11.43 | 100% | 114.3° |
| 2026-01-04 Sun | 8 | 0 | 0 | — | 87.1° 12:00 | 11.42 | 97% | 113.5° |
| 2026-01-05 Mon | 9 | 0 | 0 | — | 87.1° 11:55 | 11.4 | 92% | 111.3° |
| 2026-01-06 Tue | 9 | 22 | 2 | — | 87.1° 11:50 | 11.39 | 84% | 108.0° |
| 2026-01-07 Wed | 10 | 0 | 0 | — | 87.1° 11:45 | 11.37 | 76% | 103.7° |
| 2026-01-08 Thu | 11 | 89 | 10 | 05:15–06:10 (marginal, 0.92 h) | 87.1° 11:45 | 11.36 | 67% | 99.0° |
| 2026-01-09 Fri | 12 | 5 | 1 | — | 87.1° 11:40 | 11.34 | 57% | 94.1° |
| 2026-01-10 Sat | 14 | 0 | 0 | — | 87.1° 11:35 | 11.32 | 47% | 89.1° |
| 2026-01-11 Sun | 16 | 0 | 0 | — | 87.1° 11:30 | 11.31 | 38% | 84.3° |
| 2026-01-12 Mon | 18 | 99 | 18 | 05:40–06:10 (good, 0.5 h) | 87.1° 11:25 | 11.29 | 29% | 79.7° |
| 2026-01-13 Tue | 20 | 13 | 3 | — | 87.1° 11:25 | 11.27 | 21% | 75.4° |
| 2026-01-14 Wed | 21 | 100 | 21 | 05:25–06:10 (good, 0.75 h) | 87.1° 11:20 | 11.25 | 14% | 71.8° |
| 2026-01-15 Thu | 24 | 72 | 17 | 06:00–06:10 (good, 0.17 h) | 87.1° 11:15 | 11.23 | 8% | 68.8° |
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.