← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-04-01 Tue | 0 | — | unknown | — | 79.2° 14:15 | 8.08 | 88% | 115.9° |
| 2042-04-02 Wed | 0 | — | unknown | — | 79.2° 14:15 | 8.02 | 94% | 126.9° |
| 2042-04-03 Thu | 0 | — | unknown | — | 79.2° 14:10 | 7.97 | 98% | 137.5° |
| 2042-04-04 Fri | 0 | — | unknown | — | 79.2° 14:05 | 7.91 | 100% | 147.6° |
| 2042-04-05 Sat | 0 | — | unknown | — | 79.2° 14:00 | 7.85 | 100% | 156.1° |
| 2042-04-06 Sun | 0 | — | unknown | — | 79.2° 14:00 | 7.8 | 98% | 161.0° |
| 2042-04-07 Mon | 0 | — | unknown | — | 79.2° 13:55 | 7.74 | 95% | 159.4° |
| 2042-04-08 Tue | 0 | — | unknown | — | 79.2° 13:50 | 7.69 | 90% | 152.2° |
| 2042-04-09 Wed | 0 | — | unknown | — | 79.2° 13:45 | 7.63 | 83% | 142.4° |
| 2042-04-10 Thu | 0 | — | unknown | — | 79.2° 13:40 | 7.57 | 75% | 131.4° |
| 2042-04-11 Fri | 0 | — | unknown | — | 79.2° 13:40 | 7.52 | 66% | 119.7° |
| 2042-04-12 Sat | 0 | — | unknown | — | 79.2° 13:35 | 7.46 | 56% | 107.5° |
| 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° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-04-01&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.