← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-04-21 Mon | 0 | — | unknown | — | 89.5° 12:10 | 6.94 | 5% | 41.2° |
| 2042-04-22 Tue | 0 | — | unknown | — | 89.8° 12:00 | 6.88 | 11% | 50.4° |
| 2042-04-23 Wed | 0 | — | unknown | — | 89.8° 12:00 | 6.82 | 19% | 60.8° |
| 2042-04-24 Thu | 0 | — | unknown | — | 89.6° 11:50 | 6.76 | 28% | 71.6° |
| 2042-04-25 Fri | 0 | — | unknown | — | 89.6° 11:50 | 6.71 | 38% | 82.4° |
| 2042-04-26 Sat | 1 | — | unknown | — | 89.8° 11:45 | 6.65 | 48% | 93.0° |
| 2042-04-27 Sun | 1 | — | unknown | — | 89.8° 11:40 | 6.59 | 58% | 103.2° |
| 2042-04-28 Mon | 1 | — | unknown | — | 89.7° 11:35 | 6.53 | 68% | 113.1° |
| 2042-04-29 Tue | 1 | — | unknown | — | 89.5° 11:30 | 6.47 | 76% | 122.5° |
| 2042-04-30 Wed | 1 | — | unknown | — | 89.7° 11:30 | 6.41 | 84% | 131.1° |
| 2042-05-01 Thu | 1 | — | unknown | — | 89.8° 11:25 | 6.36 | 90% | 138.6° |
| 2042-05-02 Fri | 1 | — | unknown | — | 89.8° 11:20 | 6.3 | 95% | 144.2° |
| 2042-05-03 Sat | 1 | — | unknown | — | 89.6° 11:15 | 6.24 | 98% | 146.8° |
| 2042-05-04 Sun | 1 | — | unknown | — | 89.5° 11:15 | 6.18 | 100% | 145.8° |
| 2042-05-05 Mon | 1 | — | unknown | — | 89.7° 11:10 | 6.13 | 100% | 141.2° |
| 2042-05-06 Tue | 1 | — | unknown | — | 89.8° 11:05 | 6.07 | 97% | 134.0° |
| 2042-05-07 Wed | 1 | — | unknown | — | 89.7° 11:00 | 6.01 | 93% | 125.2° |
| 2042-05-08 Thu | 2 | — | unknown | — | 89.6° 10:55 | 5.96 | 87% | 115.4° |
| 2042-05-09 Fri | 2 | — | unknown | — | 89.6° 10:55 | 5.9 | 79% | 104.9° |
| 2042-05-10 Sat | 2 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.8° 10:50 | 5.84 | 70% | 93.9° |
| 2042-05-11 Sun | 2 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.8° 10:45 | 5.79 | 60% | 82.6° |
| 2042-05-12 Mon | 2 | — | unknown | 04:05–04:10 (marginal, 0.08 h) | 89.7° 10:40 | 5.73 | 49% | 71.3° |
| 2042-05-13 Tue | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.5° 10:35 | 5.68 | 37% | 60.1° |
| 2042-05-14 Wed | 4 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.6° 10:35 | 5.62 | 27% | 49.5° |
| 2042-05-15 Thu | 5 | — | unknown | 03:50–04:05 (marginal, 0.25 h) | 89.8° 10:30 | 5.57 | 17% | 40.4° |
| 2042-05-16 Fri | 5 | — | unknown | 04:20–04:50 (marginal, 0.5 h) | 89.8° 10:25 | 5.52 | 9% | 34.3° |
| 2042-05-17 Sat | 6 | — | unknown | 04:20–04:50 (marginal, 0.5 h) | 89.6° 10:20 | 5.47 | 3% | 33.4° |
| 2042-05-18 Sun | 6 | — | unknown | 04:15–04:50 (marginal, 0.58 h) | 89.5° 10:20 | 5.41 | 0% | 37.9° |
| 2042-05-19 Mon | 7 | — | unknown | 04:10–04:45 (marginal, 0.58 h) | 89.7° 10:15 | 5.36 | 0% | 46.2° |
| 2042-05-20 Tue | 8 | — | unknown | 04:05–04:45 (marginal, 0.67 h) | 89.8° 10:10 | 5.31 | 3% | 56.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-04-21&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.