← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-04-16 Tue | 0 | — | unknown | — | 79.2° 13:15 | 7.21 | 100% | 159.4° |
| 2041-04-17 Wed | 0 | — | unknown | — | 79.2° 13:15 | 7.16 | 98% | 157.4° |
| 2041-04-18 Thu | 0 | — | unknown | — | 79.2° 13:10 | 7.1 | 94% | 149.5° |
| 2041-04-19 Fri | 0 | — | unknown | — | 79.2° 13:05 | 7.04 | 88% | 138.9° |
| 2041-04-20 Sat | 0 | — | unknown | — | 79.2° 13:00 | 6.98 | 79% | 127.0° |
| 2041-04-21 Sun | 0 | — | unknown | — | 79.2° 13:00 | 6.92 | 70% | 114.5° |
| 2041-04-22 Mon | 0 | — | unknown | — | 79.2° 12:55 | 6.87 | 59% | 101.5° |
| 2041-04-23 Tue | 0 | — | unknown | — | 79.2° 12:50 | 6.81 | 48% | 88.4° |
| 2041-04-24 Wed | 0 | — | unknown | — | 79.2° 12:45 | 6.75 | 36% | 75.1° |
| 2041-04-25 Thu | 0 | — | unknown | — | 79.2° 12:40 | 6.69 | 26% | 61.8° |
| 2041-04-26 Fri | 0 | — | unknown | — | 79.2° 12:40 | 6.63 | 16% | 48.8° |
| 2041-04-27 Sat | 0 | — | unknown | — | 79.2° 12:35 | 6.57 | 8% | 36.5° |
| 2041-04-28 Sun | 0 | — | unknown | — | 79.2° 12:30 | 6.52 | 3% | 26.1° |
| 2041-04-29 Mon | 0 | — | unknown | — | 79.2° 12:25 | 6.46 | 0% | 20.5° |
| 2041-04-30 Tue | 0 | — | unknown | — | 79.2° 12:20 | 6.4 | 0% | 23.2° |
| 2041-05-01 Wed | 0 | — | unknown | — | 79.2° 12:20 | 6.34 | 2% | 31.9° |
| 2041-05-02 Thu | 0 | — | unknown | — | 79.2° 12:15 | 6.28 | 7% | 42.6° |
| 2041-05-03 Fri | 0 | — | unknown | — | 79.2° 12:10 | 6.23 | 13% | 54.0° |
| 2041-05-04 Sat | 0 | — | unknown | — | 79.2° 12:05 | 6.17 | 21% | 65.5° |
| 2041-05-05 Sun | 0 | — | unknown | — | 79.2° 12:00 | 6.11 | 29% | 77.0° |
| 2041-05-06 Mon | 0 | — | unknown | — | 79.2° 11:55 | 6.05 | 38% | 88.3° |
| 2041-05-07 Tue | 0 | — | unknown | — | 79.2° 11:50 | 6.0 | 48% | 99.4° |
| 2041-05-08 Wed | 0 | — | unknown | — | 79.2° 11:45 | 5.94 | 57% | 110.5° |
| 2041-05-09 Thu | 0 | — | unknown | — | 79.2° 11:45 | 5.89 | 66% | 121.4° |
| 2041-05-10 Fri | 0 | — | unknown | — | 79.2° 11:40 | 5.83 | 75% | 132.1° |
| 2041-05-11 Sat | 0 | — | unknown | — | 79.2° 11:35 | 5.77 | 83% | 142.5° |
| 2041-05-12 Sun | 0 | — | unknown | — | 79.2° 11:30 | 5.72 | 90% | 151.9° |
| 2041-05-13 Mon | 0 | — | unknown | — | 79.2° 11:25 | 5.67 | 95% | 158.4° |
| 2041-05-14 Tue | 0 | — | unknown | — | 79.2° 11:25 | 5.61 | 99% | 158.9° |
| 2041-05-15 Wed | 0 | — | unknown | — | 79.2° 11:20 | 5.56 | 100% | 152.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-04-16&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.