← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-07-23 Tue | 0 | — | unknown | — | 50.1° 17:45 | 5.39 | 16% | 110.9° |
| 2041-07-24 Wed | 0 | — | unknown | — | 50.1° 17:40 | 5.44 | 9% | 98.3° |
| 2041-07-25 Thu | 0 | — | unknown | — | 50.1° 17:40 | 5.49 | 4% | 85.9° |
| 2041-07-26 Fri | 0 | — | unknown | — | 50.1° 17:35 | 5.54 | 1% | 73.6° |
| 2041-07-27 Sat | 0 | — | unknown | — | 50.1° 17:30 | 5.6 | 0% | 61.5° |
| 2041-07-28 Sun | 0 | — | unknown | — | 50.1° 17:25 | 5.65 | 1% | 49.6° |
| 2041-07-29 Mon | 0 | — | unknown | — | 50.1° 17:20 | 5.7 | 3% | 37.7° |
| 2041-07-30 Tue | 0 | — | unknown | — | 50.1° 17:20 | 5.76 | 8% | 25.9° |
| 2041-07-31 Wed | 0 | — | unknown | — | 50.1° 17:15 | 5.81 | 13% | 14.2° |
| 2041-08-01 Thu | 0 | — | unknown | — | 50.1° 17:10 | 5.87 | 20% | 2.9° |
| 2041-08-02 Fri | 0 | — | unknown | — | 50.1° 17:05 | 5.92 | 28% | 9.9° |
| 2041-08-03 Sat | 0 | — | unknown | — | 50.1° 17:00 | 5.98 | 38% | 21.9° |
| 2041-08-04 Sun | 0 | — | unknown | — | 50.1° 17:00 | 6.03 | 47% | 34.3° |
| 2041-08-05 Mon | 0 | — | unknown | — | 50.1° 16:55 | 6.09 | 57% | 46.9° |
| 2041-08-06 Tue | 0 | — | unknown | — | 50.1° 16:50 | 6.15 | 68% | 59.9° |
| 2041-08-07 Wed | 0 | — | unknown | — | 50.1° 16:45 | 6.2 | 77% | 73.4° |
| 2041-08-08 Thu | 0 | — | unknown | — | 50.1° 16:45 | 6.26 | 86% | 87.4° |
| 2041-08-09 Fri | 0 | — | unknown | — | 50.1° 16:40 | 6.32 | 93% | 101.8° |
| 2041-08-10 Sat | 0 | — | unknown | — | 50.1° 16:35 | 6.38 | 98% | 116.7° |
| 2041-08-11 Sun | 0 | — | unknown | — | 50.1° 16:30 | 6.43 | 100% | 131.7° |
| 2041-08-12 Mon | 0 | — | unknown | — | 50.1° 16:25 | 6.49 | 99% | 146.9° |
| 2041-08-13 Tue | 0 | — | unknown | — | 50.1° 16:25 | 6.55 | 95% | 162.1° |
| 2041-08-14 Wed | 0 | — | unknown | — | 50.1° 16:20 | 6.61 | 88% | 176.5° |
| 2041-08-15 Thu | 0 | — | unknown | — | 50.1° 16:15 | 6.66 | 79% | 168.1° |
| 2041-08-16 Fri | 0 | — | unknown | — | 50.1° 16:10 | 6.72 | 69% | 153.9° |
| 2041-08-17 Sat | 0 | — | unknown | — | 50.1° 16:05 | 6.78 | 59% | 140.1° |
| 2041-08-18 Sun | 0 | — | unknown | — | 50.1° 16:05 | 6.84 | 48% | 126.8° |
| 2041-08-19 Mon | 0 | — | unknown | — | 50.1° 16:00 | 6.89 | 38% | 113.8° |
| 2041-08-20 Tue | 0 | — | unknown | — | 50.1° 15:55 | 6.95 | 28% | 101.2° |
| 2041-08-21 Wed | 0 | — | unknown | — | 50.1° 15:50 | 7.01 | 20% | 88.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-07-23&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.