← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-08-27 Thu | 44 | 97 | 43 | 21:45–04:05 (marginal, 6.33 h) | 71.1° 23:00 | 7.33 | 100% | 46.8° |
| 2026-08-28 Fri | 48 | 94 | 45 | 21:45–03:55 (marginal, 6.17 h) | 71.1° 22:55 | 7.39 | 99% | 51.9° |
| 2026-08-29 Sat | 58 | 24 | 14 | 21:40–23:00 (marginal, 1.33 h) | 71.1° 22:50 | 7.44 | 97% | 59.0° |
| 2026-08-30 Sun | 71 | 97 | 69 | 21:40–00:25 (good, 2.75 h) | 71.1° 22:45 | 7.5 | 92% | 67.3° |
| 2026-08-31 Mon | 79 | 99 | 78 | 21:35–01:40 (good, 4.08 h) | 71.1° 22:45 | 7.56 | 85% | 76.6° |
| 2026-09-01 Tue | 100 | 91 | 91 | 21:35–02:45 (good, 5.17 h) | 71.1° 22:40 | 7.61 | 76% | 86.3° |
| 2026-09-02 Wed | 100 | 9 | 9 | — | 71.1° 22:35 | 7.67 | 66% | 96.3° |
| 2026-09-03 Thu | 100 | 89 | 89 | 21:30–03:10 (good, 5.67 h) | 71.1° 22:30 | 7.72 | 55% | 106.2° |
| 2026-09-04 Fri | 100 | 96 | 96 | 21:30–03:30 (good, 6.0 h) | 71.1° 22:25 | 7.78 | 43% | 115.6° |
| 2026-09-05 Sat | 100 | 100 | 100 | 21:25–03:25 (good, 6.0 h) | 71.1° 22:25 | 7.83 | 32% | 124.1° |
| 2026-09-06 Sun | 100 | 99 | 99 | 21:25–03:25 (good, 6.0 h) | 71.1° 22:20 | 7.89 | 22% | 131.0° |
| 2026-09-07 Mon | 100 | 100 | 100 | 21:25–03:20 (good, 5.92 h) | 71.1° 22:15 | 7.94 | 13% | 135.2° |
| 2026-09-08 Tue | 100 | 100 | 100 | 21:20–03:20 (good, 6.0 h) | 71.1° 22:10 | 8.0 | 6% | 136.0° |
| 2026-09-09 Wed | 100 | 91 | 91 | 21:20–03:00 (good, 5.67 h) | 71.1° 22:10 | 8.05 | 2% | 133.2° |
| 2026-09-10 Thu | 100 | 99 | 99 | 21:15–03:10 (good, 5.92 h) | 71.1° 22:05 | 8.11 | 0% | 127.6° |
| 2026-09-11 Fri | 100 | 98 | 98 | 21:15–03:05 (good, 5.83 h) | 71.1° 22:00 | 8.16 | 1% | 120.1° |
| 2026-09-12 Sat | 100 | 0 | 0 | — | 71.1° 21:55 | 8.21 | 4% | 111.7° |
| 2026-09-13 Sun | 100 | 84 | 84 | 21:10–02:40 (good, 5.5 h) | 71.1° 21:50 | 8.27 | 9% | 102.7° |
| 2026-09-14 Mon | 100 | 51 | 51 | 00:00–02:00 (good, 2.0 h) | 71.1° 21:50 | 8.32 | 15% | 93.7° |
| 2026-09-15 Tue | 100 | 63 | 63 | 22:00–00:00 (good, 2.0 h) | 71.1° 21:45 | 8.37 | 23% | 84.7° |
| 2026-09-16 Wed | 100 | 96 | 96 | 21:05–02:45 (good, 5.67 h) | 71.1° 21:40 | 8.42 | 32% | 76.1° |
| 2026-09-17 Thu | 100 | 100 | 100 | 21:05–02:40 (good, 5.58 h) | 71.1° 21:35 | 8.48 | 41% | 67.9° |
| 2026-09-18 Fri | 100 | 83 | 83 | 21:00–02:35 (good, 5.58 h) | 71.1° 21:30 | 8.53 | 51% | 60.4° |
| 2026-09-19 Sat | 94 | 92 | 87 | 21:00–02:00 (good, 5.0 h) | 71.1° 21:30 | 8.58 | 60% | 53.7° |
| 2026-09-20 Sun | 86 | 97 | 83 | 21:00–02:30 (good, 5.5 h) | 71.1° 21:25 | 8.63 | 69% | 48.4° |
| 2026-09-21 Mon | 64 | 0 | 0 | — | 71.1° 21:20 | 8.68 | 78% | 44.9° |
| 2026-09-22 Tue | 47 | 3 | 2 | — | 71.1° 21:15 | 8.73 | 85% | 43.9° |
| 2026-09-23 Wed | 41 | 86 | 35 | 20:50–02:25 (marginal, 5.58 h) | 71.1° 21:15 | 8.78 | 92% | 45.6° |
| 2026-09-24 Thu | 38 | 84 | 32 | 20:50–02:15 (marginal, 5.42 h) | 71.1° 21:10 | 8.84 | 96% | 49.9° |
| 2026-09-25 Fri | 40 | 4 | 1 | — | 71.1° 21:05 | 8.89 | 99% | 56.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-08-27&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.