← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-09-23 Tue | 0 | — | unknown | — | 50.1° 13:45 | 8.79 | 64% | 101.8° |
| 2042-09-24 Wed | 0 | — | unknown | — | 50.1° 13:40 | 8.84 | 74% | 115.1° |
| 2042-09-25 Thu | 0 | — | unknown | — | 50.1° 13:35 | 8.89 | 83% | 128.9° |
| 2042-09-26 Fri | 0 | — | unknown | — | 50.1° 13:30 | 8.94 | 91% | 143.1° |
| 2042-09-27 Sat | 0 | — | unknown | — | 50.1° 13:25 | 8.99 | 96% | 157.7° |
| 2042-09-28 Sun | 0 | — | unknown | — | 50.1° 13:25 | 9.04 | 100% | 172.1° |
| 2042-09-29 Mon | 0 | — | unknown | — | 50.1° 13:20 | 9.09 | 100% | 171.0° |
| 2042-09-30 Tue | 0 | — | unknown | — | 50.1° 13:15 | 9.14 | 97% | 156.3° |
| 2042-10-01 Wed | 0 | — | unknown | — | 50.1° 13:10 | 9.19 | 91% | 141.3° |
| 2042-10-02 Thu | 0 | — | unknown | — | 50.1° 13:05 | 9.23 | 83% | 126.6° |
| 2042-10-03 Fri | 0 | — | unknown | — | 50.1° 13:05 | 9.28 | 73% | 112.3° |
| 2042-10-04 Sat | 0 | — | unknown | — | 50.1° 13:00 | 9.33 | 63% | 98.4° |
| 2042-10-05 Sun | 0 | — | unknown | — | 50.1° 12:55 | 9.38 | 52% | 84.9° |
| 2042-10-06 Mon | 0 | — | unknown | — | 50.1° 12:50 | 9.42 | 41% | 71.9° |
| 2042-10-07 Tue | 0 | — | unknown | — | 50.1° 12:50 | 9.47 | 32% | 59.1° |
| 2042-10-08 Wed | 0 | — | unknown | — | 50.1° 12:45 | 9.51 | 23% | 46.7° |
| 2042-10-09 Thu | 0 | — | unknown | — | 50.1° 12:40 | 9.56 | 15% | 34.5° |
| 2042-10-10 Fri | 0 | — | unknown | — | 50.1° 12:35 | 9.61 | 9% | 22.5° |
| 2042-10-11 Sat | 0 | — | unknown | — | 50.1° 12:30 | 9.65 | 4% | 10.9° |
| 2042-10-12 Sun | 0 | — | unknown | — | 50.1° 12:30 | 9.69 | 1% | 4.0° |
| 2042-10-13 Mon | 0 | — | unknown | — | 50.1° 12:25 | 9.74 | 0% | 13.9° |
| 2042-10-14 Tue | 0 | — | unknown | — | 50.1° 12:20 | 9.78 | 1% | 25.5° |
| 2042-10-15 Wed | 0 | — | unknown | — | 50.1° 12:15 | 9.83 | 3% | 37.3° |
| 2042-10-16 Thu | 0 | — | unknown | — | 50.1° 12:10 | 9.87 | 7% | 49.1° |
| 2042-10-17 Fri | 0 | — | unknown | — | 50.1° 12:10 | 9.91 | 13% | 61.0° |
| 2042-10-18 Sat | 0 | — | unknown | — | 50.1° 12:00 | 9.95 | 20% | 73.1° |
| 2042-10-19 Sun | 0 | — | unknown | — | 50.1° 12:00 | 10.0 | 28% | 85.4° |
| 2042-10-20 Mon | 0 | — | unknown | — | 50.1° 11:55 | 10.04 | 38% | 97.8° |
| 2042-10-21 Tue | 0 | — | unknown | — | 50.1° 11:50 | 10.08 | 48% | 110.7° |
| 2042-10-22 Wed | 0 | — | unknown | — | 50.1° 11:45 | 10.12 | 58% | 123.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-09-23&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.