← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-09-10 Wed | 16 | 55 | 9 | 01:00–02:00 (marginal, 1.0 h) | 72.5° 05:45 | 8.12 | 87% | 28.4° |
| 2025-09-11 Thu | 22 | 52 | 12 | 02:00–05:00 (marginal, 3.0 h) | 72.5° 05:45 | 8.17 | 78% | 13.8° |
| 2025-09-12 Fri | 33 | 31 | 10 | 04:00–05:25 (marginal, 1.42 h) | 72.5° 05:40 | 8.23 | 67% | 1.1° |
| 2025-09-13 Sat | 49 | 100 | 49 | 03:35–03:45 (good, 0.17 h) | 72.5° 05:35 | 8.28 | 56% | 14.9° |
| 2025-09-14 Sun | 68 | 41 | 28 | 02:10–04:00 (good, 1.83 h) | 72.5° 05:30 | 8.33 | 44% | 28.9° |
| 2025-09-15 Mon | 83 | 100 | 83 | 00:20–05:30 (good, 5.17 h) | 72.5° 05:30 | 8.38 | 34% | 42.6° |
| 2025-09-16 Tue | 91 | 100 | 91 | 00:20–05:30 (good, 5.17 h) | 72.5° 05:25 | 8.44 | 24% | 56.1° |
| 2025-09-17 Wed | 99 | 92 | 91 | 01:00–05:35 (good, 4.58 h) | 72.5° 05:20 | 8.49 | 15% | 69.4° |
| 2025-09-18 Thu | 100 | 100 | 100 | 00:10–05:35 (good, 5.42 h) | 72.5° 05:15 | 8.54 | 8% | 82.5° |
| 2025-09-19 Fri | 100 | 97 | 97 | 00:10–05:35 (good, 5.42 h) | 72.5° 05:10 | 8.59 | 4% | 95.4° |
| 2025-09-20 Sat | 100 | 83 | 83 | 01:00–05:35 (good, 4.58 h) | 72.5° 05:10 | 8.64 | 1% | 108.1° |
| 2025-09-21 Sun | 100 | 100 | 100 | 00:00–05:40 (good, 5.67 h) | 72.5° 05:05 | 8.7 | 0% | 120.5° |
| 2025-09-22 Mon | 100 | 100 | 100 | 23:55–05:40 (good, 5.75 h) | 72.5° 05:00 | 8.75 | 1% | 132.8° |
| 2025-09-23 Tue | 100 | 100 | 100 | 23:50–05:40 (good, 5.83 h) | 72.5° 04:55 | 8.8 | 4% | 144.9° |
| 2025-09-24 Wed | 100 | 85 | 85 | 23:50–04:00 (good, 4.17 h) | 72.5° 04:50 | 8.85 | 9% | 156.9° |
| 2025-09-25 Thu | 100 | 0 | 0 | — | 72.5° 04:50 | 8.9 | 15% | 168.7° |
| 2025-09-26 Fri | 100 | 26 | 26 | 00:00–03:00 (marginal, 3.0 h) | 72.5° 04:45 | 8.95 | 22% | 179.0° |
| 2025-09-27 Sat | 100 | 0 | 0 | — | 72.5° 04:40 | 9.0 | 31% | 167.6° |
| 2025-09-28 Sun | 100 | 0 | 0 | — | 72.5° 04:35 | 9.05 | 40% | 155.7° |
| 2025-09-29 Mon | 100 | 6 | 6 | 05:00–05:45 (marginal, 0.75 h) | 72.5° 04:35 | 9.09 | 49% | 143.7° |
| 2025-09-30 Tue | 100 | 83 | 83 | 00:00–05:50 (good, 5.83 h) | 72.5° 04:30 | 9.14 | 59% | 131.3° |
| 2025-10-01 Wed | 100 | 0 | 0 | — | 72.5° 04:25 | 9.19 | 69% | 118.7° |
| 2025-10-02 Thu | 100 | 0 | 0 | — | 72.5° 04:20 | 9.24 | 78% | 105.7° |
| 2025-10-03 Fri | 100 | 0 | 0 | — | 72.5° 04:15 | 9.29 | 86% | 92.2° |
| 2025-10-04 Sat | 100 | 99 | 99 | 00:55–05:50 (good, 4.92 h) | 72.5° 04:15 | 9.33 | 93% | 78.2° |
| 2025-10-05 Sun | 71 | 23 | 16 | 00:00–01:00 (marginal, 1.0 h) | 72.5° 04:10 | 9.38 | 98% | 63.8° |
| 2025-10-06 Mon | 46 | 0 | 0 | — | 72.5° 04:05 | 9.43 | 100% | 49.1° |
| 2025-10-07 Tue | 25 | 0 | 0 | — | 72.5° 04:00 | 9.47 | 99% | 34.2° |
| 2025-10-08 Wed | 19 | 0 | 0 | — | 72.5° 03:55 | 9.52 | 95% | 19.1° |
| 2025-10-09 Thu | 23 | 96 | 22 | 23:00–03:20 (marginal, 4.33 h) | 72.5° 03:55 | 9.57 | 89% | 4.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-09-10&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.