← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-09-11 Thu | 100 | 28 | 28 | 02:00–05:00 (marginal, 3.0 h) | 87.3° 22:55 | 8.17 | 78% | 73.8° |
| 2025-09-12 Fri | 100 | 27 | 27 | 21:15–22:00 (good, 0.75 h) | 87.2° 22:50 | 8.23 | 67% | 80.9° |
| 2025-09-13 Sat | 100 | 94 | 94 | 21:10–04:45 (good, 7.58 h) | 87.2° 22:50 | 8.28 | 56% | 88.3° |
| 2025-09-14 Sun | 100 | 35 | 35 | 02:00–04:00 (good, 2.0 h) | 87.3° 22:45 | 8.33 | 44% | 95.7° |
| 2025-09-15 Mon | 100 | 100 | 100 | 21:05–04:50 (good, 7.75 h) | 87.3° 22:40 | 8.38 | 34% | 102.8° |
| 2025-09-16 Tue | 100 | 100 | 100 | 21:05–04:50 (good, 7.75 h) | 87.2° 22:35 | 8.44 | 24% | 109.1° |
| 2025-09-17 Wed | 100 | 92 | 92 | 21:05–04:45 (good, 7.67 h) | 87.2° 22:35 | 8.49 | 15% | 114.5° |
| 2025-09-18 Thu | 100 | 100 | 100 | 21:00–04:50 (good, 7.83 h) | 87.3° 22:30 | 8.54 | 8% | 118.6° |
| 2025-09-19 Fri | 100 | 98 | 98 | 21:00–04:40 (good, 7.67 h) | 87.3° 22:25 | 8.59 | 4% | 121.2° |
| 2025-09-20 Sat | 100 | 73 | 73 | 01:00–04:40 (good, 3.67 h) | 87.3° 22:20 | 8.64 | 1% | 122.0° |
| 2025-09-21 Sun | 100 | 100 | 100 | 20:55–04:35 (good, 7.67 h) | 87.2° 22:15 | 8.7 | 0% | 121.2° |
| 2025-09-22 Mon | 100 | 100 | 100 | 20:55–04:35 (good, 7.67 h) | 87.2° 22:15 | 8.75 | 1% | 118.8° |
| 2025-09-23 Tue | 100 | 100 | 100 | 20:50–04:30 (good, 7.67 h) | 87.3° 22:10 | 8.8 | 4% | 115.1° |
| 2025-09-24 Wed | 100 | 95 | 95 | 20:50–04:00 (good, 7.17 h) | 87.3° 22:05 | 8.85 | 9% | 110.4° |
| 2025-09-25 Thu | 100 | 0 | 0 | — | 87.3° 22:00 | 8.9 | 15% | 105.0° |
| 2025-09-26 Fri | 100 | 20 | 20 | 00:00–01:00 (good, 1.0 h) | 87.2° 21:55 | 8.95 | 22% | 99.1° |
| 2025-09-27 Sat | 100 | 16 | 16 | 20:45–21:00 (good, 0.25 h) | 87.2° 21:55 | 9.0 | 31% | 93.0° |
| 2025-09-28 Sun | 100 | 0 | 0 | — | 87.3° 21:50 | 9.05 | 40% | 86.6° |
| 2025-09-29 Mon | 100 | 0 | 0 | — | 87.3° 21:45 | 9.09 | 49% | 80.4° |
| 2025-09-30 Tue | 100 | 50 | 50 | 00:00–04:00 (good, 4.0 h) | 87.2° 21:40 | 9.14 | 59% | 74.3° |
| 2025-10-01 Wed | 93 | 0 | 0 | — | 87.2° 21:40 | 9.19 | 69% | 68.6° |
| 2025-10-02 Thu | 85 | 0 | 0 | — | 87.3° 21:35 | 9.24 | 78% | 63.8° |
| 2025-10-03 Fri | 63 | 0 | 0 | — | 87.3° 21:30 | 9.29 | 86% | 60.1° |
| 2025-10-04 Sat | 60 | 94 | 56 | 20:30–04:15 (marginal, 7.75 h) | 87.3° 21:25 | 9.33 | 93% | 58.1° |
| 2025-10-05 Sun | 57 | 56 | 32 | 20:30–23:00 (marginal, 2.5 h) | 87.2° 21:20 | 9.38 | 98% | 58.3° |
| 2025-10-06 Mon | 57 | 0 | 0 | — | 87.2° 21:20 | 9.43 | 100% | 60.8° |
| 2025-10-07 Tue | 65 | 0 | 0 | — | 87.3° 21:15 | 9.47 | 99% | 65.3° |
| 2025-10-08 Wed | 71 | 0 | 0 | — | 87.3° 21:10 | 9.52 | 95% | 71.4° |
| 2025-10-09 Thu | 78 | 95 | 74 | 20:25–22:45 (good, 2.33 h) | 87.3° 21:05 | 9.57 | 89% | 78.5° |
| 2025-10-10 Fri | 100 | 82 | 82 | 20:20–01:05 (good, 4.75 h) | 87.2° 21:00 | 9.61 | 80% | 86.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-09-11&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.