← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-12-16 Tue | 100 | 100 | 100 | 18:35–01:45 (good, 7.17 h) | 79.1° 20:15 | 11.5 | 9% | 157.3° |
| 2025-12-17 Wed | 100 | 67 | 67 | 18:35–23:00 (good, 4.42 h) | 79.1° 20:10 | 11.5 | 4% | 147.8° |
| 2025-12-18 Thu | 100 | 0 | 0 | — | 79.1° 20:05 | 11.5 | 1% | 137.2° |
| 2025-12-19 Fri | 100 | 95 | 95 | 18:35–01:20 (good, 6.75 h) | 79.1° 20:00 | 11.51 | 0% | 126.0° |
| 2025-12-20 Sat | 100 | 10 | 10 | 18:35–19:00 (good, 0.42 h) | 79.1° 20:00 | 11.51 | 1% | 114.5° |
| 2025-12-21 Sun | 100 | 0 | 0 | — | 79.1° 19:55 | 11.51 | 3% | 102.8° |
| 2025-12-22 Mon | 100 | 18 | 18 | 18:35–20:00 (good, 1.42 h) | 79.1° 19:50 | 11.51 | 8% | 90.9° |
| 2025-12-23 Tue | 100 | 2 | 2 | — | 79.1° 19:45 | 11.51 | 14% | 78.9° |
| 2025-12-24 Wed | 100 | 0 | 0 | — | 79.1° 19:40 | 11.5 | 21% | 66.7° |
| 2025-12-25 Thu | 97 | 0 | 0 | — | 79.1° 19:40 | 11.5 | 30% | 54.3° |
| 2025-12-26 Fri | 88 | 35 | 31 | 18:40–20:00 (marginal, 1.33 h) | 79.1° 19:35 | 11.5 | 41% | 42.0° |
| 2025-12-27 Sat | 74 | 100 | 74 | 18:40–01:05 (good, 6.42 h) | 79.1° 19:30 | 11.49 | 51% | 29.9° |
| 2025-12-28 Sun | 57 | 64 | 36 | 19:00–22:00 (marginal, 3.0 h) | 79.1° 19:25 | 11.48 | 62% | 19.5° |
| 2025-12-29 Mon | 36 | 100 | 36 | 18:40–01:10 (marginal, 6.5 h) | 79.1° 19:25 | 11.48 | 73% | 15.5° |
| 2025-12-30 Tue | 24 | 24 | 6 | 18:40–20:00 (marginal, 1.33 h) | 79.1° 19:20 | 11.47 | 83% | 22.5° |
| 2025-12-31 Wed | 20 | 41 | 8 | 18:45–19:00 (marginal, 0.25 h) | 79.1° 19:15 | 11.46 | 91% | 34.7° |
| 2026-01-01 Thu | 29 | 100 | 29 | 18:45–00:15 (marginal, 5.5 h) | 79.1° 19:10 | 11.45 | 97% | 48.4° |
| 2026-01-02 Fri | 44 | 83 | 36 | 18:45–23:00 (marginal, 4.25 h) | 79.1° 19:05 | 11.44 | 100% | 62.6° |
| 2026-01-03 Sat | 65 | 0 | 0 | — | 79.1° 19:05 | 11.43 | 100% | 76.8° |
| 2026-01-04 Sun | 81 | 0 | 0 | — | 79.1° 19:00 | 11.42 | 97% | 90.9° |
| 2026-01-05 Mon | 100 | 0 | 0 | — | 79.1° 18:55 | 11.4 | 92% | 104.6° |
| 2026-01-06 Tue | 100 | 0 | 0 | — | 79.1° 18:50 | 11.39 | 84% | 117.8° |
| 2026-01-07 Wed | 100 | 0 | 0 | — | 79.1° 18:45 | 11.37 | 76% | 130.4° |
| 2026-01-08 Thu | 100 | 41 | 41 | 23:00–00:05 (good, 1.08 h) | 79.1° 18:45 | 11.36 | 67% | 142.2° |
| 2026-01-09 Fri | 100 | 52 | 52 | 21:00–23:00 (good, 2.0 h) | 79.1° 18:40 | 11.34 | 57% | 153.1° |
| 2026-01-10 Sat | 100 | 33 | 33 | 21:00–22:00 (good, 1.0 h) | 79.1° 18:35 | 11.32 | 47% | 161.7° |
| 2026-01-11 Sun | 100 | 0 | 0 | — | 79.1° 18:30 | 11.31 | 38% | 164.7° |
| 2026-01-12 Mon | 100 | 96 | 96 | 19:00–00:00 (good, 5.0 h) | 79.1° 18:30 | 11.29 | 29% | 159.7° |
| 2026-01-13 Tue | 100 | 7 | 7 | 23:00–23:40 (marginal, 0.67 h) | 79.1° 18:25 | 11.27 | 21% | 150.7° |
| 2026-01-14 Wed | 100 | 99 | 99 | 18:55–23:50 (good, 4.92 h) | 79.1° 18:20 | 11.25 | 14% | 140.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-12-16&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.