← 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. |
|---|---|---|---|---|---|---|---|---|
| 2030-04-21 Sun | 0 | — | unknown | — | 79.1° 13:00 | 6.94 | 80% | 125.6° |
| 2030-04-22 Mon | 0 | — | unknown | — | 79.1° 12:55 | 6.89 | 70% | 112.0° |
| 2030-04-23 Tue | 0 | — | unknown | — | 79.1° 12:50 | 6.83 | 59% | 98.5° |
| 2030-04-24 Wed | 0 | — | unknown | — | 79.1° 12:45 | 6.77 | 48% | 85.5° |
| 2030-04-25 Thu | 0 | — | unknown | — | 79.1° 12:45 | 6.71 | 38% | 72.8° |
| 2030-04-26 Fri | 0 | — | unknown | — | 79.1° 12:40 | 6.65 | 28% | 60.5° |
| 2030-04-27 Sat | 0 | — | unknown | — | 79.1° 12:35 | 6.59 | 20% | 48.6° |
| 2030-04-28 Sun | 0 | — | unknown | — | 79.1° 12:30 | 6.54 | 12% | 37.2° |
| 2030-04-29 Mon | 0 | — | unknown | — | 79.1° 12:25 | 6.48 | 7% | 26.8° |
| 2030-04-30 Tue | 0 | — | unknown | — | 79.1° 12:25 | 6.42 | 3% | 18.5° |
| 2030-05-01 Wed | 0 | — | unknown | — | 79.1° 12:20 | 6.36 | 0% | 15.9° |
| 2030-05-02 Thu | 0 | — | unknown | — | 79.1° 12:15 | 6.3 | 0% | 21.0° |
| 2030-05-03 Fri | 0 | — | unknown | — | 79.1° 12:10 | 6.25 | 2% | 30.0° |
| 2030-05-04 Sat | 0 | — | unknown | — | 79.1° 12:05 | 6.19 | 5% | 40.4° |
| 2030-05-05 Sun | 0 | — | unknown | — | 79.1° 12:00 | 6.13 | 10% | 51.4° |
| 2030-05-06 Mon | 0 | — | unknown | — | 79.1° 12:00 | 6.07 | 16% | 62.6° |
| 2030-05-07 Tue | 0 | — | unknown | — | 79.1° 11:50 | 6.02 | 24% | 74.1° |
| 2030-05-08 Wed | 0 | — | unknown | — | 79.1° 11:50 | 5.96 | 32% | 85.9° |
| 2030-05-09 Thu | 0 | — | unknown | — | 79.1° 11:45 | 5.9 | 42% | 97.8° |
| 2030-05-10 Fri | 0 | — | unknown | — | 79.1° 11:40 | 5.85 | 52% | 110.1° |
| 2030-05-11 Sat | 0 | — | unknown | — | 79.1° 11:35 | 5.79 | 63% | 122.6° |
| 2030-05-12 Sun | 0 | — | unknown | — | 79.1° 11:30 | 5.74 | 73% | 135.3° |
| 2030-05-13 Mon | 0 | — | unknown | — | 79.1° 11:30 | 5.68 | 82% | 147.9° |
| 2030-05-14 Tue | 0 | — | unknown | — | 79.1° 11:25 | 5.63 | 90% | 159.2° |
| 2030-05-15 Wed | 0 | — | unknown | — | 79.1° 11:20 | 5.58 | 96% | 164.2° |
| 2030-05-16 Thu | 0 | — | unknown | — | 79.1° 11:15 | 5.52 | 100% | 157.5° |
| 2030-05-17 Fri | 0 | — | unknown | — | 79.1° 11:10 | 5.47 | 100% | 145.2° |
| 2030-05-18 Sat | 0 | — | unknown | — | 79.1° 11:10 | 5.42 | 97% | 131.3° |
| 2030-05-19 Sun | 0 | — | unknown | — | 79.1° 11:05 | 5.37 | 91% | 117.2° |
| 2030-05-20 Mon | 0 | — | unknown | — | 79.1° 11:00 | 5.32 | 83% | 103.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-04-21&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.