← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-08-19 Tue | 0 | — | unknown | — | 42.9° 09:05 | 6.86 | 3% | 82.1° |
| 2031-08-20 Wed | 1 | — | unknown | — | 42.9° 09:00 | 6.92 | 7% | 93.3° |
| 2031-08-21 Thu | 1 | — | unknown | — | 42.9° 08:55 | 6.98 | 14% | 104.6° |
| 2031-08-22 Fri | 1 | — | unknown | — | 42.9° 08:55 | 7.03 | 21% | 116.0° |
| 2031-08-23 Sat | 1 | — | unknown | — | 42.9° 08:50 | 7.09 | 30% | 127.2° |
| 2031-08-24 Sun | 2 | — | unknown | 05:30–05:40 (marginal, 0.17 h) | 42.9° 08:45 | 7.15 | 41% | 137.9° |
| 2031-08-25 Mon | 3 | — | unknown | 05:25–05:40 (marginal, 0.25 h) | 42.9° 08:40 | 7.2 | 52% | 147.2° |
| 2031-08-26 Tue | 4 | — | unknown | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.26 | 63% | 153.2° |
| 2031-08-27 Wed | 5 | — | unknown | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.32 | 74% | 152.9° |
| 2031-08-28 Thu | 6 | — | unknown | 05:15–05:45 (marginal, 0.5 h) | 42.9° 08:30 | 7.37 | 83% | 146.3° |
| 2031-08-29 Fri | 8 | — | unknown | 04:40–05:45 (marginal, 1.08 h) | 42.9° 08:25 | 7.43 | 91% | 135.8° |
| 2031-08-30 Sat | 8 | — | unknown | 04:35–05:10 (marginal, 0.58 h) | 42.9° 08:20 | 7.49 | 97% | 123.7° |
| 2031-08-31 Sun | 7 | — | unknown | 04:30–05:10 (marginal, 0.67 h) | 42.9° 08:15 | 7.54 | 100% | 110.8° |
| 2031-09-01 Mon | 6 | — | unknown | 04:30–05:10 (marginal, 0.67 h) | 42.9° 08:15 | 7.6 | 99% | 97.7° |
| 2031-09-02 Tue | 6 | — | unknown | 04:30–05:15 (marginal, 0.75 h) | 42.9° 08:10 | 7.66 | 97% | 84.8° |
| 2031-09-03 Wed | 5 | — | unknown | 04:35–05:15 (marginal, 0.67 h) | 42.9° 08:05 | 7.71 | 92% | 72.3° |
| 2031-09-04 Thu | 5 | — | unknown | 04:40–05:15 (marginal, 0.58 h) | 42.9° 08:00 | 7.77 | 84% | 60.4° |
| 2031-09-05 Fri | 5 | — | unknown | 04:40–05:15 (marginal, 0.58 h) | 42.9° 07:55 | 7.82 | 76% | 49.3° |
| 2031-09-06 Sat | 6 | — | unknown | 04:30–05:20 (marginal, 0.83 h) | 42.9° 07:55 | 7.88 | 67% | 39.4° |
| 2031-09-07 Sun | 7 | — | unknown | 04:20–05:20 (marginal, 1.0 h) | 42.9° 07:50 | 7.93 | 57% | 31.4° |
| 2031-09-08 Mon | 10 | — | unknown | 04:05–05:20 (marginal, 1.25 h) | 42.9° 07:45 | 7.99 | 48% | 26.6° |
| 2031-09-09 Tue | 14 | — | unknown | 05:15–05:20 (good, 0.08 h) | 42.9° 07:40 | 8.04 | 38% | 26.5° |
| 2031-09-10 Wed | 18 | — | unknown | 04:45–05:25 (good, 0.67 h) | 42.9° 07:40 | 8.09 | 29% | 31.0° |
| 2031-09-11 Thu | 23 | — | unknown | 04:30–05:25 (good, 0.92 h) | 42.9° 07:35 | 8.15 | 21% | 38.4° |
| 2031-09-12 Fri | 27 | — | unknown | 04:20–05:25 (good, 1.08 h) | 42.9° 07:30 | 8.2 | 14% | 47.4° |
| 2031-09-13 Sat | 30 | — | unknown | 04:10–05:25 (good, 1.25 h) | 42.9° 07:25 | 8.26 | 8% | 57.4° |
| 2031-09-14 Sun | 34 | — | unknown | 04:10–05:30 (good, 1.33 h) | 42.9° 07:20 | 8.31 | 4% | 68.0° |
| 2031-09-15 Mon | 35 | — | unknown | 04:05–05:30 (good, 1.42 h) | 42.9° 07:20 | 8.36 | 1% | 79.0° |
| 2031-09-16 Tue | 37 | — | unknown | 04:00–05:30 (good, 1.5 h) | 42.9° 07:15 | 8.41 | 0% | 90.2° |
| 2031-09-17 Wed | 38 | — | unknown | 03:55–05:30 (good, 1.58 h) | 42.9° 07:10 | 8.47 | 2% | 101.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-08-19&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.