← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-09-22 Mon | 100 | 100 | 100 | 20:55–02:20 (good, 5.42 h) | 71.1° 21:15 | 8.75 | 1% | 110.6° |
| 2025-09-23 Tue | 100 | 99 | 99 | 20:50–02:20 (good, 5.5 h) | 71.1° 21:10 | 8.8 | 4% | 102.5° |
| 2025-09-24 Wed | 100 | 97 | 97 | 20:50–02:15 (good, 5.42 h) | 71.1° 21:10 | 8.85 | 9% | 94.2° |
| 2025-09-25 Thu | 100 | 0 | 0 | — | 71.1° 21:05 | 8.9 | 15% | 85.9° |
| 2025-09-26 Fri | 100 | 20 | 20 | 00:00–02:10 (marginal, 2.17 h) | 71.1° 21:00 | 8.95 | 22% | 77.7° |
| 2025-09-27 Sat | 100 | 23 | 23 | 20:45–21:00 (good, 0.25 h) | 71.1° 20:55 | 9.0 | 31% | 69.8° |
| 2025-09-28 Sun | 100 | 0 | 0 | — | 71.1° 20:50 | 9.05 | 40% | 62.4° |
| 2025-09-29 Mon | 97 | 0 | 0 | — | 71.1° 20:50 | 9.09 | 49% | 55.7° |
| 2025-09-30 Tue | 89 | 32 | 29 | 00:00–01:30 (good, 1.5 h) | 71.1° 20:45 | 9.14 | 59% | 50.2° |
| 2025-10-01 Wed | 75 | 0 | 0 | — | 71.1° 20:40 | 9.19 | 69% | 46.5° |
| 2025-10-02 Thu | 51 | 0 | 0 | — | 71.1° 20:35 | 9.24 | 78% | 45.4° |
| 2025-10-03 Fri | 43 | 0 | 0 | — | 71.1° 20:30 | 9.29 | 86% | 47.3° |
| 2025-10-04 Sat | 39 | 91 | 35 | 20:30–01:40 (marginal, 5.17 h) | 71.1° 20:30 | 9.33 | 93% | 52.0° |
| 2025-10-05 Sun | 40 | 72 | 29 | 20:30–23:00 (marginal, 2.5 h) | 71.1° 20:25 | 9.38 | 98% | 59.2° |
| 2025-10-06 Mon | 47 | 0 | 0 | — | 71.1° 20:20 | 9.43 | 100% | 68.1° |
| 2025-10-07 Tue | 58 | 0 | 0 | — | 71.1° 20:15 | 9.47 | 99% | 78.1° |
| 2025-10-08 Wed | 71 | 0 | 0 | — | 71.1° 20:15 | 9.52 | 95% | 88.6° |
| 2025-10-09 Thu | 85 | 94 | 80 | 20:25–00:50 (good, 4.42 h) | 71.1° 20:10 | 9.57 | 89% | 99.1° |
| 2025-10-10 Fri | 100 | 93 | 93 | 20:20–00:55 (good, 4.58 h) | 71.1° 20:05 | 9.61 | 80% | 109.1° |
| 2025-10-11 Sat | 100 | 51 | 51 | 20:20–22:00 (good, 1.67 h) | 71.1° 20:00 | 9.66 | 70% | 118.2° |
| 2025-10-12 Sun | 100 | 26 | 26 | 00:00–01:30 (marginal, 1.5 h) | 71.1° 19:55 | 9.7 | 59% | 125.8° |
| 2025-10-13 Mon | 100 | 8 | 8 | — | 71.1° 19:55 | 9.74 | 48% | 131.4° |
| 2025-10-14 Tue | 100 | 0 | 0 | — | 71.1° 19:50 | 9.79 | 38% | 134.3° |
| 2025-10-15 Wed | 100 | 15 | 15 | 23:00–00:00 (good, 1.0 h) | 71.1° 19:45 | 9.83 | 28% | 134.3° |
| 2025-10-16 Thu | 100 | 0 | 0 | — | 71.1° 19:40 | 9.87 | 19% | 131.6° |
| 2025-10-17 Fri | 100 | 0 | 0 | — | 71.1° 19:35 | 9.92 | 12% | 126.6° |
| 2025-10-18 Sat | 100 | 0 | 0 | — | 71.1° 19:35 | 9.96 | 6% | 120.2° |
| 2025-10-19 Sun | 100 | 0 | 0 | — | 71.1° 19:30 | 10.0 | 2% | 112.8° |
| 2025-10-20 Mon | 100 | 40 | 40 | 20:05–21:00 (good, 0.92 h) | 71.1° 19:25 | 10.04 | 0% | 104.8° |
| 2025-10-21 Tue | 100 | 22 | 22 | 23:00–00:00 (marginal, 1.0 h) | 71.1° 19:20 | 10.08 | 0% | 96.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-09-22&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.