← 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. |
|---|---|---|---|---|---|---|---|---|
| 2045-05-19 Fri | 0 | — | unknown | — | 79.2° 11:05 | 5.35 | 13% | 68.3° |
| 2045-05-20 Sat | 0 | — | unknown | — | 79.2° 11:00 | 5.3 | 22% | 82.2° |
| 2045-05-21 Sun | 0 | — | unknown | — | 79.2° 10:55 | 5.25 | 32% | 96.1° |
| 2045-05-22 Mon | 0 | — | unknown | — | 79.2° 10:50 | 5.2 | 43% | 109.8° |
| 2045-05-23 Tue | 0 | — | unknown | — | 79.2° 10:50 | 5.16 | 55% | 123.3° |
| 2045-05-24 Wed | 0 | — | unknown | — | 79.2° 10:45 | 5.11 | 66% | 136.5° |
| 2045-05-25 Thu | 0 | — | unknown | — | 79.2° 10:40 | 5.06 | 76% | 148.9° |
| 2045-05-26 Fri | 0 | — | unknown | — | 79.2° 10:35 | 5.02 | 84% | 159.7° |
| 2045-05-27 Sat | 0 | — | unknown | — | 79.2° 10:30 | 4.98 | 91% | 165.2° |
| 2045-05-28 Sun | 1 | — | unknown | — | 79.2° 10:30 | 4.93 | 96% | 160.8° |
| 2045-05-29 Mon | 0 | — | unknown | — | 79.2° 10:25 | 4.89 | 99% | 150.8° |
| 2045-05-30 Tue | 1 | — | unknown | — | 79.2° 10:20 | 4.86 | 100% | 139.5° |
| 2045-05-31 Wed | 1 | — | unknown | — | 79.2° 10:15 | 4.82 | 98% | 127.8° |
| 2045-06-01 Thu | 1 | — | unknown | — | 79.2° 10:15 | 4.78 | 95% | 116.0° |
| 2045-06-02 Fri | 1 | — | unknown | — | 79.2° 10:10 | 4.75 | 90% | 104.4° |
| 2045-06-03 Sat | 1 | — | unknown | — | 79.2° 10:05 | 4.71 | 84% | 92.8° |
| 2045-06-04 Sun | 1 | — | unknown | — | 79.2° 10:00 | 4.68 | 76% | 81.3° |
| 2045-06-05 Mon | 1 | — | unknown | — | 79.2° 09:55 | 4.65 | 68% | 69.9° |
| 2045-06-06 Tue | 1 | — | unknown | — | 79.2° 09:55 | 4.62 | 59% | 58.5° |
| 2045-06-07 Wed | 1 | — | unknown | — | 79.2° 09:50 | 4.6 | 49% | 47.1° |
| 2045-06-08 Thu | 1 | — | unknown | — | 79.2° 09:45 | 4.57 | 40% | 35.8° |
| 2045-06-09 Fri | 2 | — | unknown | — | 79.2° 09:40 | 4.55 | 30% | 25.1° |
| 2045-06-10 Sat | 2 | — | unknown | 04:20–04:30 (marginal, 0.17 h) | 79.2° 09:35 | 4.53 | 21% | 16.5° |
| 2045-06-11 Sun | 3 | — | unknown | 04:10–04:30 (marginal, 0.33 h) | 79.2° 09:35 | 4.51 | 13% | 15.6° |
| 2045-06-12 Mon | 4 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.2° 09:30 | 4.49 | 7% | 24.0° |
| 2045-06-13 Tue | 5 | — | unknown | 04:00–04:30 (marginal, 0.5 h) | 79.2° 09:25 | 4.47 | 2% | 36.0° |
| 2045-06-14 Wed | 6 | — | unknown | 03:55–04:30 (marginal, 0.58 h) | 79.2° 09:20 | 4.46 | 0% | 49.3° |
| 2045-06-15 Thu | 7 | — | unknown | 03:50–04:30 (marginal, 0.67 h) | 79.2° 09:20 | 4.45 | 1% | 63.3° |
| 2045-06-16 Fri | 8 | — | unknown | 03:45–04:30 (marginal, 0.75 h) | 79.2° 09:15 | 4.44 | 5% | 77.6° |
| 2045-06-17 Sat | 9 | — | unknown | 03:15–04:30 (marginal, 1.25 h) | 79.2° 09:10 | 4.43 | 11% | 91.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-05-19&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.