← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-08-10 Sat | 0 | — | unknown | — | 42.9° 09:40 | 6.38 | 98% | 129.4° |
| 2041-08-11 Sun | 0 | — | unknown | — | 42.9° 09:35 | 6.43 | 100% | 117.8° |
| 2041-08-12 Mon | 0 | — | unknown | — | 42.9° 09:30 | 6.49 | 99% | 105.3° |
| 2041-08-13 Tue | 0 | — | unknown | — | 42.9° 09:25 | 6.55 | 95% | 92.6° |
| 2041-08-14 Wed | 0 | — | unknown | — | 42.9° 09:20 | 6.61 | 88% | 79.9° |
| 2041-08-15 Thu | 0 | — | unknown | — | 42.9° 09:20 | 6.66 | 79% | 67.7° |
| 2041-08-16 Fri | 0 | — | unknown | — | 42.9° 09:15 | 6.72 | 69% | 56.4° |
| 2041-08-17 Sat | 0 | — | unknown | — | 42.9° 09:10 | 6.78 | 59% | 46.3° |
| 2041-08-18 Sun | 0 | — | unknown | — | 42.9° 09:05 | 6.84 | 48% | 38.3° |
| 2041-08-19 Mon | 0 | — | unknown | — | 42.9° 09:05 | 6.89 | 38% | 33.2° |
| 2041-08-20 Tue | 1 | — | unknown | — | 42.9° 09:00 | 6.95 | 28% | 32.3° |
| 2041-08-21 Wed | 1 | — | unknown | — | 42.9° 08:55 | 7.01 | 20% | 35.5° |
| 2041-08-22 Thu | 1 | — | unknown | — | 42.9° 08:50 | 7.07 | 12% | 41.7° |
| 2041-08-23 Fri | 1 | — | unknown | — | 42.9° 08:45 | 7.12 | 7% | 49.7° |
| 2041-08-24 Sat | 2 | — | unknown | 05:30–05:40 (marginal, 0.17 h) | 42.9° 08:45 | 7.18 | 3% | 58.7° |
| 2041-08-25 Sun | 4 | — | unknown | 05:25–05:40 (marginal, 0.25 h) | 42.9° 08:40 | 7.24 | 1% | 68.3° |
| 2041-08-26 Mon | 4 | — | unknown | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.29 | 0% | 78.1° |
| 2041-08-27 Tue | 5 | — | unknown | 04:45–05:05 (marginal, 0.33 h) | 42.9° 08:30 | 7.35 | 2% | 88.0° |
| 2041-08-28 Wed | 7 | — | unknown | 04:40–05:05 (marginal, 0.42 h) | 42.9° 08:25 | 7.41 | 5% | 98.1° |
| 2041-08-29 Thu | 8 | — | unknown | 04:40–05:45 (marginal, 1.08 h) | 42.9° 08:25 | 7.46 | 9% | 108.0° |
| 2041-08-30 Fri | 9 | — | unknown | 05:05–05:10 (good, 0.08 h) | 42.9° 08:20 | 7.52 | 16% | 117.8° |
| 2041-08-31 Sat | 10 | — | unknown | 05:00–05:10 (good, 0.17 h) | 42.9° 08:15 | 7.58 | 23% | 127.2° |
| 2041-09-01 Sun | 13 | — | unknown | 04:55–05:15 (good, 0.33 h) | 42.9° 08:10 | 7.63 | 32% | 135.8° |
| 2041-09-02 Mon | 15 | — | unknown | 04:55–05:15 (good, 0.33 h) | 42.9° 08:10 | 7.69 | 42% | 142.9° |
| 2041-09-03 Tue | 16 | — | unknown | 04:50–05:15 (good, 0.42 h) | 42.9° 08:05 | 7.74 | 52% | 147.2° |
| 2041-09-04 Wed | 17 | — | unknown | 04:45–05:15 (good, 0.5 h) | 42.9° 08:00 | 7.8 | 63% | 147.1° |
| 2041-09-05 Thu | 21 | — | unknown | 04:40–05:20 (good, 0.67 h) | 42.9° 07:55 | 7.85 | 73% | 142.2° |
| 2041-09-06 Fri | 22 | — | unknown | 04:40–05:20 (good, 0.67 h) | 42.9° 07:50 | 7.91 | 83% | 133.8° |
| 2041-09-07 Sat | 23 | — | unknown | 04:35–05:20 (good, 0.75 h) | 42.9° 07:50 | 7.96 | 91% | 123.1° |
| 2041-09-08 Sun | 22 | — | unknown | 04:45–05:20 (good, 0.58 h) | 42.9° 07:45 | 8.02 | 96% | 111.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-08-10&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.