← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-04-13 Sun | 0 | — | unknown | — | 79.2° 13:30 | 7.4 | 45% | 94.8° |
| 2042-04-14 Mon | 0 | — | unknown | — | 79.2° 13:25 | 7.34 | 34% | 81.8° |
| 2042-04-15 Tue | 0 | — | unknown | — | 79.2° 13:20 | 7.29 | 24% | 68.4° |
| 2042-04-16 Wed | 0 | — | unknown | — | 79.2° 13:20 | 7.23 | 14% | 54.8° |
| 2042-04-17 Thu | 0 | — | unknown | — | 79.2° 13:15 | 7.17 | 7% | 41.4° |
| 2042-04-18 Fri | 0 | — | unknown | — | 79.2° 13:10 | 7.11 | 2% | 29.0° |
| 2042-04-19 Sat | 0 | — | unknown | — | 79.2° 13:05 | 7.05 | 0% | 20.0° |
| 2042-04-20 Sun | 0 | — | unknown | — | 79.2° 13:05 | 7.0 | 1% | 20.1° |
| 2042-04-21 Mon | 0 | — | unknown | — | 79.2° 13:00 | 6.94 | 5% | 28.8° |
| 2042-04-22 Tue | 0 | — | unknown | — | 79.2° 12:55 | 6.88 | 11% | 40.6° |
| 2042-04-23 Wed | 0 | — | unknown | — | 79.2° 12:50 | 6.82 | 19% | 53.1° |
| 2042-04-24 Thu | 0 | — | unknown | — | 79.2° 12:45 | 6.76 | 28% | 65.6° |
| 2042-04-25 Fri | 0 | — | unknown | — | 79.2° 12:45 | 6.71 | 38% | 77.9° |
| 2042-04-26 Sat | 0 | — | unknown | — | 79.2° 12:40 | 6.65 | 48% | 89.8° |
| 2042-04-27 Sun | 0 | — | unknown | — | 79.2° 12:35 | 6.59 | 58% | 101.5° |
| 2042-04-28 Mon | 0 | — | unknown | — | 79.2° 12:30 | 6.53 | 68% | 112.8° |
| 2042-04-29 Tue | 0 | — | unknown | — | 79.2° 12:25 | 6.47 | 76% | 123.9° |
| 2042-04-30 Wed | 0 | — | unknown | — | 79.2° 12:25 | 6.41 | 84% | 134.7° |
| 2042-05-01 Thu | 0 | — | unknown | — | 79.2° 12:20 | 6.36 | 90% | 144.9° |
| 2042-05-02 Fri | 0 | — | unknown | — | 79.2° 12:15 | 6.3 | 95% | 154.0° |
| 2042-05-03 Sat | 0 | — | unknown | — | 79.2° 12:10 | 6.24 | 98% | 160.3° |
| 2042-05-04 Sun | 0 | — | unknown | — | 79.2° 12:10 | 6.18 | 100% | 160.5° |
| 2042-05-05 Mon | 0 | — | unknown | — | 79.2° 12:00 | 6.13 | 100% | 154.4° |
| 2042-05-06 Tue | 0 | — | unknown | — | 79.2° 12:00 | 6.07 | 97% | 145.0° |
| 2042-05-07 Wed | 0 | — | unknown | — | 79.2° 11:50 | 6.01 | 93% | 134.1° |
| 2042-05-08 Thu | 0 | — | unknown | — | 79.2° 11:50 | 5.96 | 87% | 122.5° |
| 2042-05-09 Fri | 0 | — | unknown | — | 79.2° 11:45 | 5.9 | 79% | 110.4° |
| 2042-05-10 Sat | 0 | — | unknown | — | 79.2° 11:40 | 5.84 | 70% | 98.0° |
| 2042-05-11 Sun | 0 | — | unknown | — | 79.2° 11:35 | 5.79 | 60% | 85.2° |
| 2042-05-12 Mon | 0 | — | unknown | — | 79.2° 11:30 | 5.73 | 49% | 72.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-04-13&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.