← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-09-01 Tue | 4 | 75 | 3 | — | 42.9° 08:10 | 7.61 | 76% | 54.6° |
| 2026-09-02 Wed | 4 | 0 | 0 | — | 42.9° 08:10 | 7.67 | 66% | 45.1° |
| 2026-09-03 Thu | 6 | 76 | 5 | 04:50–05:15 (marginal, 0.42 h) | 42.9° 08:05 | 7.72 | 55% | 37.6° |
| 2026-09-04 Fri | 8 | 100 | 8 | 04:20–05:15 (marginal, 0.92 h) | 42.9° 08:00 | 7.78 | 43% | 33.7° |
| 2026-09-05 Sat | 12 | 100 | 12 | 05:10–05:15 (good, 0.08 h) | 42.9° 07:55 | 7.83 | 32% | 34.9° |
| 2026-09-06 Sun | 17 | 100 | 17 | 04:50–05:20 (good, 0.5 h) | 42.9° 07:50 | 7.89 | 22% | 40.7° |
| 2026-09-07 Mon | 20 | 100 | 20 | 04:40–05:20 (good, 0.67 h) | 42.9° 07:50 | 7.94 | 13% | 49.5° |
| 2026-09-08 Tue | 23 | 100 | 23 | 04:30–05:20 (good, 0.83 h) | 42.9° 07:45 | 8.0 | 6% | 60.0° |
| 2026-09-09 Wed | 26 | 61 | 16 | 04:30–05:00 (good, 0.5 h) | 42.9° 07:40 | 8.05 | 2% | 71.3° |
| 2026-09-10 Thu | 28 | 100 | 28 | 04:25–05:25 (good, 1.0 h) | 42.9° 07:35 | 8.11 | 0% | 82.7° |
| 2026-09-11 Fri | 29 | 100 | 29 | 04:20–05:25 (good, 1.08 h) | 42.9° 07:35 | 8.16 | 1% | 94.1° |
| 2026-09-12 Sat | 30 | 0 | 0 | — | 42.9° 07:30 | 8.21 | 4% | 105.2° |
| 2026-09-13 Sun | 33 | 96 | 32 | 04:20–05:30 (good, 1.17 h) | 42.9° 07:25 | 8.27 | 9% | 115.7° |
| 2026-09-14 Mon | 35 | 0 | 0 | — | 42.9° 07:20 | 8.32 | 15% | 125.4° |
| 2026-09-15 Tue | 36 | 99 | 36 | 04:05–05:30 (good, 1.42 h) | 42.9° 07:15 | 8.37 | 23% | 134.0° |
| 2026-09-16 Wed | 37 | 100 | 37 | 04:00–05:30 (good, 1.5 h) | 42.9° 07:15 | 8.42 | 32% | 140.9° |
| 2026-09-17 Thu | 39 | 100 | 39 | 03:55–05:30 (good, 1.58 h) | 42.9° 07:10 | 8.48 | 41% | 145.4° |
| 2026-09-18 Fri | 41 | 90 | 37 | 03:55–05:35 (good, 1.67 h) | 42.9° 07:05 | 8.53 | 51% | 146.5° |
| 2026-09-19 Sat | 43 | 72 | 31 | 04:05–05:35 (good, 1.5 h) | 42.9° 07:00 | 8.58 | 60% | 144.0° |
| 2026-09-20 Sun | 44 | 100 | 44 | 03:45–05:35 (good, 1.83 h) | 42.9° 06:55 | 8.63 | 69% | 138.5° |
| 2026-09-21 Mon | 45 | 0 | 0 | — | 42.9° 06:55 | 8.68 | 78% | 131.0° |
| 2026-09-22 Tue | 48 | 80 | 38 | 04:00–05:40 (good, 1.67 h) | 42.9° 06:50 | 8.73 | 85% | 122.1° |
| 2026-09-23 Wed | 48 | 99 | 47 | 03:45–05:40 (good, 1.92 h) | 42.9° 06:45 | 8.78 | 92% | 112.3° |
| 2026-09-24 Thu | 44 | 45 | 20 | 03:50–04:00 (good, 0.17 h) | 42.9° 06:40 | 8.84 | 96% | 101.8° |
| 2026-09-25 Fri | 31 | 0 | 0 | — | 42.9° 06:40 | 8.89 | 99% | 90.8° |
| 2026-09-26 Sat | 25 | 0 | 0 | — | 42.9° 06:35 | 8.94 | 100% | 79.6° |
| 2026-09-27 Sun | 19 | 50 | 9 | — | 42.9° 06:30 | 8.98 | 98% | 68.3° |
| 2026-09-28 Mon | 14 | 0 | 0 | — | 42.9° 06:25 | 9.03 | 94% | 57.4° |
| 2026-09-29 Tue | 12 | 0 | 0 | — | 42.9° 06:20 | 9.08 | 87% | 47.3° |
| 2026-09-30 Wed | 12 | 18 | 2 | — | 42.9° 06:20 | 9.13 | 78% | 39.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-09-01&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.