← 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 | 7 | 58 | 4 | 04:15–05:00 (marginal, 0.75 h) | 42.9° 07:30 | 8.17 | 78% | 48.7° |
| 2025-09-12 Fri | 8 | 87 | 7 | 04:15–05:25 (marginal, 1.17 h) | 42.9° 07:30 | 8.23 | 67% | 40.1° |
| 2025-09-13 Sat | 12 | 100 | 12 | 03:50–05:30 (marginal, 1.67 h) | 42.9° 07:25 | 8.28 | 56% | 34.9° |
| 2025-09-14 Sun | 17 | 21 | 4 | 03:45–04:00 (marginal, 0.25 h) | 42.9° 07:20 | 8.33 | 44% | 34.3° |
| 2025-09-15 Mon | 23 | 100 | 23 | 04:25–05:30 (good, 1.08 h) | 42.9° 07:15 | 8.38 | 34% | 38.4° |
| 2025-09-16 Tue | 29 | 100 | 29 | 04:10–05:30 (good, 1.33 h) | 42.9° 07:10 | 8.44 | 24% | 45.7° |
| 2025-09-17 Wed | 35 | 92 | 32 | 04:05–05:35 (good, 1.5 h) | 42.9° 07:10 | 8.49 | 15% | 54.8° |
| 2025-09-18 Thu | 39 | 100 | 39 | 03:50–05:35 (good, 1.75 h) | 42.9° 07:05 | 8.54 | 8% | 64.8° |
| 2025-09-19 Fri | 43 | 97 | 42 | 03:50–05:35 (good, 1.75 h) | 42.9° 07:00 | 8.59 | 4% | 75.1° |
| 2025-09-20 Sat | 45 | 99 | 45 | 03:45–05:35 (good, 1.83 h) | 42.9° 06:55 | 8.64 | 1% | 85.5° |
| 2025-09-21 Sun | 47 | 100 | 47 | 03:40–05:40 (good, 2.0 h) | 42.9° 06:55 | 8.7 | 0% | 95.9° |
| 2025-09-22 Mon | 48 | 100 | 48 | 03:35–05:40 (good, 2.08 h) | 42.9° 06:50 | 8.75 | 1% | 106.0° |
| 2025-09-23 Tue | 50 | 100 | 50 | 03:30–05:40 (good, 2.17 h) | 42.9° 06:45 | 8.8 | 4% | 115.7° |
| 2025-09-24 Wed | 52 | 68 | 35 | 03:30–04:00 (good, 0.5 h) | 42.9° 06:40 | 8.85 | 9% | 124.8° |
| 2025-09-25 Thu | 53 | 0 | 0 | — | 42.9° 06:35 | 8.9 | 15% | 133.0° |
| 2025-09-26 Fri | 55 | 6 | 3 | — | 42.9° 06:35 | 8.95 | 22% | 139.9° |
| 2025-09-27 Sat | 57 | 0 | 0 | — | 42.9° 06:30 | 9.0 | 31% | 144.5° |
| 2025-09-28 Sun | 59 | 0 | 0 | — | 42.9° 06:25 | 9.05 | 40% | 146.1° |
| 2025-09-29 Mon | 60 | 12 | 7 | — | 42.9° 06:20 | 9.09 | 49% | 144.0° |
| 2025-09-30 Tue | 63 | 96 | 61 | 03:05–05:50 (good, 2.75 h) | 42.9° 06:15 | 9.14 | 59% | 138.7° |
| 2025-10-01 Wed | 64 | 0 | 0 | — | 42.9° 06:15 | 9.19 | 69% | 130.9° |
| 2025-10-02 Thu | 66 | 0 | 0 | — | 42.9° 06:10 | 9.24 | 78% | 121.6° |
| 2025-10-03 Fri | 65 | 0 | 0 | — | 42.9° 06:05 | 9.29 | 86% | 111.0° |
| 2025-10-04 Sat | 61 | 100 | 61 | 03:10–05:50 (good, 2.67 h) | 42.9° 06:00 | 9.33 | 93% | 99.7° |
| 2025-10-05 Sun | 43 | 3 | 1 | — | 42.9° 05:55 | 9.38 | 98% | 87.7° |
| 2025-10-06 Mon | 32 | 0 | 0 | — | 42.9° 05:55 | 9.43 | 100% | 75.6° |
| 2025-10-07 Tue | 22 | 0 | 0 | — | 42.9° 05:50 | 9.47 | 99% | 63.6° |
| 2025-10-08 Wed | 16 | 0 | 0 | — | 42.9° 05:45 | 9.52 | 95% | 52.3° |
| 2025-10-09 Thu | 13 | 94 | 12 | 05:00–06:00 (marginal, 1.0 h) | 42.9° 05:40 | 9.57 | 89% | 42.6° |
| 2025-10-10 Fri | 13 | 10 | 1 | — | 42.9° 05:40 | 9.61 | 80% | 35.9° |
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.