← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-08-17 Sun | 0 | — | unknown | — | 42.9° 09:10 | 6.76 | 5% | 88.4° |
| 2042-08-18 Mon | 0 | — | unknown | — | 42.9° 09:05 | 6.82 | 9% | 98.5° |
| 2042-08-19 Tue | 1 | — | unknown | — | 42.9° 09:05 | 6.88 | 16% | 108.3° |
| 2042-08-20 Wed | 1 | — | unknown | — | 42.9° 09:00 | 6.94 | 23% | 117.8° |
| 2042-08-21 Thu | 1 | — | unknown | — | 42.9° 08:55 | 6.99 | 32% | 126.7° |
| 2042-08-22 Fri | 1 | — | unknown | — | 42.9° 08:50 | 7.05 | 41% | 134.9° |
| 2042-08-23 Sat | 1 | — | unknown | — | 42.9° 08:50 | 7.11 | 50% | 141.6° |
| 2042-08-24 Sun | 2 | — | unknown | 05:30–05:40 (marginal, 0.17 h) | 42.9° 08:45 | 7.17 | 60% | 145.9° |
| 2042-08-25 Mon | 3 | — | unknown | 05:25–05:40 (marginal, 0.25 h) | 42.9° 08:40 | 7.22 | 70% | 146.4° |
| 2042-08-26 Tue | 4 | — | unknown | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.28 | 79% | 142.8° |
| 2042-08-27 Wed | 5 | — | unknown | 04:45–05:05 (marginal, 0.33 h) | 42.9° 08:30 | 7.34 | 87% | 135.8° |
| 2042-08-28 Thu | 6 | — | unknown | 05:15–05:45 (marginal, 0.5 h) | 42.9° 08:30 | 7.39 | 94% | 126.3° |
| 2042-08-29 Fri | 7 | — | unknown | 04:40–05:10 (marginal, 0.5 h) | 42.9° 08:25 | 7.45 | 98% | 115.4° |
| 2042-08-30 Sat | 6 | — | unknown | 04:35–05:10 (marginal, 0.58 h) | 42.9° 08:20 | 7.51 | 100% | 103.5° |
| 2042-08-31 Sun | 5 | — | unknown | 04:35–05:10 (marginal, 0.58 h) | 42.9° 08:15 | 7.56 | 99% | 91.1° |
| 2042-09-01 Mon | 5 | — | unknown | 04:40–05:10 (marginal, 0.5 h) | 42.9° 08:10 | 7.62 | 95% | 78.6° |
| 2042-09-02 Tue | 5 | — | unknown | 04:45–05:15 (marginal, 0.5 h) | 42.9° 08:10 | 7.67 | 88% | 66.5° |
| 2042-09-03 Wed | 4 | — | unknown | 04:45–05:15 (marginal, 0.5 h) | 42.9° 08:05 | 7.73 | 80% | 55.0° |
| 2042-09-04 Thu | 5 | — | unknown | 04:40–05:15 (marginal, 0.58 h) | 42.9° 08:00 | 7.78 | 70% | 45.0° |
| 2042-09-05 Fri | 7 | — | unknown | 04:30–05:20 (marginal, 0.83 h) | 42.9° 07:55 | 7.84 | 59% | 37.4° |
| 2042-09-06 Sat | 9 | — | unknown | 04:15–05:20 (marginal, 1.08 h) | 42.9° 07:55 | 7.89 | 48% | 33.6° |
| 2042-09-07 Sun | 13 | — | unknown | 05:05–05:20 (good, 0.25 h) | 42.9° 07:50 | 7.95 | 37% | 34.5° |
| 2042-09-08 Mon | 17 | — | unknown | 04:50–05:20 (good, 0.5 h) | 42.9° 07:45 | 8.0 | 27% | 39.4° |
| 2042-09-09 Tue | 22 | — | unknown | 04:35–05:25 (good, 0.83 h) | 42.9° 07:40 | 8.06 | 18% | 46.9° |
| 2042-09-10 Wed | 26 | — | unknown | 04:25–05:25 (good, 1.0 h) | 42.9° 07:35 | 8.11 | 11% | 55.9° |
| 2042-09-11 Thu | 28 | — | unknown | 04:20–05:25 (good, 1.08 h) | 42.9° 07:35 | 8.17 | 6% | 65.5° |
| 2042-09-12 Fri | 30 | — | unknown | 04:15–05:25 (good, 1.17 h) | 42.9° 07:30 | 8.22 | 2% | 75.5° |
| 2042-09-13 Sat | 33 | — | unknown | 04:10–05:30 (good, 1.33 h) | 42.9° 07:25 | 8.27 | 0% | 85.6° |
| 2042-09-14 Sun | 35 | — | unknown | 04:05–05:30 (good, 1.42 h) | 42.9° 07:20 | 8.33 | 0% | 95.6° |
| 2042-09-15 Mon | 36 | — | unknown | 04:05–05:30 (good, 1.42 h) | 42.9° 07:15 | 8.38 | 2% | 105.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-08-17&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.