← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-08-20 Thu | 1 | 100 | 1 | — | 42.9° 09:00 | 6.93 | 58% | 142.7° |
| 2026-08-21 Fri | 1 | 100 | 1 | — | 42.9° 08:55 | 6.99 | 67% | 146.1° |
| 2026-08-22 Sat | 1 | 100 | 1 | — | 42.9° 08:50 | 7.04 | 76% | 146.0° |
| 2026-08-23 Sun | 2 | 53 | 1 | — | 42.9° 08:50 | 7.1 | 83% | 142.4° |
| 2026-08-24 Mon | 2 | 100 | 2 | 05:30–05:40 (marginal, 0.17 h) | 42.9° 08:45 | 7.16 | 90% | 136.1° |
| 2026-08-25 Tue | 3 | 94 | 3 | 05:30–05:40 (marginal, 0.17 h) | 42.9° 08:40 | 7.22 | 95% | 128.0° |
| 2026-08-26 Wed | 4 | 98 | 4 | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.27 | 98% | 118.7° |
| 2026-08-27 Thu | 4 | 99 | 4 | 04:45–05:05 (marginal, 0.33 h) | 42.9° 08:30 | 7.33 | 100% | 108.6° |
| 2026-08-28 Fri | 3 | 85 | 3 | 05:00–05:05 (marginal, 0.08 h) | 42.9° 08:30 | 7.39 | 99% | 98.0° |
| 2026-08-29 Sat | 4 | 0 | 0 | — | 42.9° 08:25 | 7.44 | 97% | 87.1° |
| 2026-08-30 Sun | 3 | 100 | 3 | 04:50–05:10 (marginal, 0.33 h) | 42.9° 08:20 | 7.5 | 92% | 76.1° |
| 2026-08-31 Mon | 3 | 100 | 3 | 04:50–05:10 (marginal, 0.33 h) | 42.9° 08:15 | 7.56 | 85% | 65.1° |
| 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° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-08-20&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.