← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-09-07 Sun | 63 | 0 | 0 | — | 87.1° 20:50 | 7.96 | 100% | 77.4° |
| 2025-09-08 Mon | 71 | 32 | 23 | 01:00–03:05 (marginal, 2.08 h) | 87.1° 20:45 | 8.01 | 98% | 82.7° |
| 2025-09-09 Tue | 79 | 98 | 78 | 21:20–01:00 (good, 3.67 h) | 87.1° 20:45 | 8.06 | 94% | 88.5° |
| 2025-09-10 Wed | 84 | 71 | 60 | 22:00–00:00 (good, 2.0 h) | 87.1° 20:40 | 8.12 | 87% | 94.3° |
| 2025-09-11 Thu | 100 | 12 | 12 | 02:00–02:50 (marginal, 0.83 h) | 87.1° 20:35 | 8.17 | 78% | 99.9° |
| 2025-09-12 Fri | 100 | 21 | 21 | 21:15–22:00 (good, 0.75 h) | 87.1° 20:30 | 8.23 | 67% | 104.9° |
| 2025-09-13 Sat | 100 | 92 | 92 | 21:10–02:15 (good, 5.08 h) | 87.1° 20:25 | 8.28 | 56% | 108.9° |
| 2025-09-14 Sun | 100 | 28 | 28 | 21:10–22:00 (good, 0.83 h) | 87.1° 20:25 | 8.33 | 44% | 111.8° |
| 2025-09-15 Mon | 100 | 99 | 99 | 21:05–02:15 (good, 5.17 h) | 87.1° 20:20 | 8.38 | 34% | 113.4° |
| 2025-09-16 Tue | 100 | 100 | 100 | 21:05–02:10 (good, 5.08 h) | 87.1° 20:15 | 8.44 | 24% | 113.6° |
| 2025-09-17 Wed | 100 | 91 | 91 | 21:05–02:10 (good, 5.08 h) | 87.1° 20:10 | 8.49 | 15% | 112.4° |
| 2025-09-18 Thu | 100 | 100 | 100 | 21:00–02:05 (good, 5.08 h) | 87.1° 20:05 | 8.54 | 8% | 110.0° |
| 2025-09-19 Fri | 100 | 99 | 99 | 21:00–02:00 (good, 5.0 h) | 87.1° 20:05 | 8.59 | 4% | 106.6° |
| 2025-09-20 Sat | 100 | 63 | 63 | 21:00–23:00 (good, 2.0 h) | 87.1° 20:00 | 8.64 | 1% | 102.6° |
| 2025-09-21 Sun | 100 | 100 | 100 | 20:55–01:55 (good, 5.0 h) | 87.1° 19:55 | 8.7 | 0% | 98.0° |
| 2025-09-22 Mon | 100 | 100 | 100 | 20:55–01:50 (good, 4.92 h) | 87.1° 19:50 | 8.75 | 1% | 93.2° |
| 2025-09-23 Tue | 100 | 99 | 99 | 20:50–01:45 (good, 4.92 h) | 87.1° 19:50 | 8.8 | 4% | 88.4° |
| 2025-09-24 Wed | 100 | 97 | 97 | 20:50–01:45 (good, 4.92 h) | 87.1° 19:45 | 8.85 | 9% | 83.6° |
| 2025-09-25 Thu | 100 | 0 | 0 | — | 87.1° 19:40 | 8.9 | 15% | 79.2° |
| 2025-09-26 Fri | 100 | 18 | 18 | 00:00–01:35 (marginal, 1.58 h) | 87.1° 19:35 | 8.95 | 22% | 75.1° |
| 2025-09-27 Sat | 100 | 25 | 25 | 20:45–21:00 (good, 0.25 h) | 87.1° 19:30 | 9.0 | 31% | 71.7° |
| 2025-09-28 Sun | 99 | 0 | 0 | — | 87.1° 19:30 | 9.05 | 40% | 68.9° |
| 2025-09-29 Mon | 92 | 0 | 0 | — | 87.1° 19:25 | 9.09 | 49% | 67.1° |
| 2025-09-30 Tue | 84 | 26 | 22 | 00:00–01:00 (good, 1.0 h) | 87.1° 19:20 | 9.14 | 59% | 66.3° |
| 2025-10-01 Wed | 69 | 0 | 0 | — | 87.1° 19:15 | 9.19 | 69% | 66.7° |
| 2025-10-02 Thu | 60 | 0 | 0 | — | 87.1° 19:10 | 9.24 | 78% | 68.4° |
| 2025-10-03 Fri | 54 | 0 | 0 | — | 87.1° 19:10 | 9.29 | 86% | 71.3° |
| 2025-10-04 Sat | 52 | 90 | 47 | 21:00–22:00 (good, 1.0 h) | 87.1° 19:05 | 9.33 | 93% | 75.3° |
| 2025-10-05 Sun | 52 | 74 | 38 | 20:30–21:00 (good, 0.5 h) | 87.1° 19:00 | 9.38 | 98% | 80.3° |
| 2025-10-06 Mon | 57 | 0 | 0 | — | 87.1° 18:55 | 9.43 | 100% | 86.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-09-07&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.