← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-05-15 Thu | 0 | — | unknown | — | 79.2° 11:20 | 5.57 | 17% | 33.5° |
| 2042-05-16 Fri | 0 | — | unknown | — | 79.2° 11:15 | 5.52 | 9% | 23.0° |
| 2042-05-17 Sat | 0 | — | unknown | — | 79.2° 11:15 | 5.47 | 3% | 18.7° |
| 2042-05-18 Sun | 0 | — | unknown | — | 79.2° 11:10 | 5.41 | 0% | 24.4° |
| 2042-05-19 Mon | 0 | — | unknown | — | 79.2° 11:05 | 5.36 | 0% | 35.3° |
| 2042-05-20 Tue | 0 | — | unknown | — | 79.2° 11:00 | 5.31 | 3% | 47.8° |
| 2042-05-21 Wed | 0 | — | unknown | — | 79.2° 10:55 | 5.26 | 8% | 60.6° |
| 2042-05-22 Thu | 0 | — | unknown | — | 79.2° 10:55 | 5.22 | 15% | 73.2° |
| 2042-05-23 Fri | 0 | — | unknown | — | 79.2° 10:50 | 5.17 | 23% | 85.6° |
| 2042-05-24 Sat | 0 | — | unknown | — | 79.2° 10:45 | 5.12 | 32% | 97.6° |
| 2042-05-25 Sun | 0 | — | unknown | — | 79.2° 10:40 | 5.08 | 42% | 109.3° |
| 2042-05-26 Mon | 0 | — | unknown | — | 79.2° 10:35 | 5.03 | 52% | 120.6° |
| 2042-05-27 Tue | 0 | — | unknown | — | 79.2° 10:35 | 4.99 | 61% | 131.6° |
| 2042-05-28 Wed | 0 | — | unknown | — | 79.2° 10:30 | 4.95 | 70% | 142.0° |
| 2042-05-29 Thu | 0 | — | unknown | — | 79.2° 10:25 | 4.91 | 78% | 151.6° |
| 2042-05-30 Fri | 1 | — | unknown | — | 79.2° 10:20 | 4.87 | 86% | 158.9° |
| 2042-05-31 Sat | 1 | — | unknown | — | 79.2° 10:20 | 4.83 | 92% | 161.2° |
| 2042-06-01 Sun | 1 | — | unknown | — | 79.2° 10:15 | 4.79 | 96% | 156.7° |
| 2042-06-02 Mon | 1 | — | unknown | — | 79.2° 10:10 | 4.76 | 99% | 147.8° |
| 2042-06-03 Tue | 1 | — | unknown | — | 79.2° 10:05 | 4.72 | 100% | 137.1° |
| 2042-06-04 Wed | 1 | — | unknown | — | 79.2° 10:00 | 4.69 | 99% | 125.5° |
| 2042-06-05 Thu | 1 | — | unknown | — | 79.2° 10:00 | 4.66 | 95% | 113.4° |
| 2042-06-06 Fri | 1 | — | unknown | — | 79.2° 09:55 | 4.63 | 90% | 100.8° |
| 2042-06-07 Sat | 1 | — | unknown | — | 79.2° 09:50 | 4.6 | 82% | 88.1° |
| 2042-06-08 Sun | 1 | — | unknown | — | 79.2° 09:45 | 4.58 | 73% | 75.1° |
| 2042-06-09 Mon | 1 | — | unknown | — | 79.2° 09:40 | 4.55 | 62% | 62.1° |
| 2042-06-10 Tue | 2 | — | unknown | — | 79.2° 09:40 | 4.53 | 51% | 49.2° |
| 2042-06-11 Wed | 2 | — | unknown | — | 79.2° 09:35 | 4.51 | 40% | 36.7° |
| 2042-06-12 Thu | 3 | — | unknown | 04:20–04:30 (marginal, 0.17 h) | 79.2° 09:30 | 4.49 | 29% | 25.6° |
| 2042-06-13 Fri | 4 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.2° 09:25 | 4.48 | 19% | 18.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-05-15&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.