← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-05-20 Tue | 0 | — | unknown | — | 79.1° 11:00 | 5.33 | 0% | 29.0° |
| 2031-05-21 Wed | 0 | — | unknown | — | 79.1° 11:00 | 5.28 | 0% | 39.4° |
| 2031-05-22 Thu | 0 | — | unknown | — | 79.1° 10:55 | 5.23 | 2% | 50.3° |
| 2031-05-23 Fri | 0 | — | unknown | — | 79.1° 10:50 | 5.18 | 6% | 61.4° |
| 2031-05-24 Sat | 0 | — | unknown | — | 79.1° 10:45 | 5.14 | 12% | 72.7° |
| 2031-05-25 Sun | 0 | — | unknown | — | 79.1° 10:40 | 5.09 | 18% | 83.9° |
| 2031-05-26 Mon | 0 | — | unknown | — | 79.1° 10:40 | 5.05 | 26% | 95.3° |
| 2031-05-27 Tue | 0 | — | unknown | — | 79.1° 10:35 | 5.0 | 35% | 106.6° |
| 2031-05-28 Wed | 0 | — | unknown | — | 79.1° 10:30 | 4.96 | 45% | 118.1° |
| 2031-05-29 Thu | 1 | — | unknown | — | 79.1° 10:25 | 4.92 | 55% | 129.7° |
| 2031-05-30 Fri | 1 | — | unknown | — | 79.1° 10:20 | 4.88 | 65% | 141.2° |
| 2031-05-31 Sat | 1 | — | unknown | — | 79.1° 10:20 | 4.84 | 74% | 152.2° |
| 2031-06-01 Sun | 1 | — | unknown | — | 79.1° 10:15 | 4.8 | 83% | 160.9° |
| 2031-06-02 Mon | 1 | — | unknown | — | 79.1° 10:10 | 4.77 | 91% | 162.1° |
| 2031-06-03 Tue | 1 | — | unknown | — | 79.1° 10:05 | 4.73 | 96% | 154.1° |
| 2031-06-04 Wed | 1 | — | unknown | — | 79.1° 10:05 | 4.7 | 100% | 142.0° |
| 2031-06-05 Thu | 1 | — | unknown | — | 79.1° 10:00 | 4.67 | 100% | 128.3° |
| 2031-06-06 Fri | 1 | — | unknown | — | 79.1° 09:55 | 4.64 | 97% | 114.1° |
| 2031-06-07 Sat | 1 | — | unknown | — | 79.1° 09:50 | 4.61 | 91% | 99.8° |
| 2031-06-08 Sun | 1 | — | unknown | — | 79.1° 09:45 | 4.59 | 83% | 85.7° |
| 2031-06-09 Mon | 1 | — | unknown | — | 79.1° 09:45 | 4.56 | 74% | 71.8° |
| 2031-06-10 Tue | 1 | — | unknown | — | 79.1° 09:40 | 4.54 | 63% | 58.5° |
| 2031-06-11 Wed | 2 | — | unknown | — | 79.1° 09:35 | 4.52 | 52% | 45.7° |
| 2031-06-12 Thu | 2 | — | unknown | 03:35–03:40 (marginal, 0.08 h) | 79.1° 09:30 | 4.5 | 41% | 33.9° |
| 2031-06-13 Fri | 3 | — | unknown | 04:15–04:30 (marginal, 0.25 h) | 79.1° 09:25 | 4.48 | 31% | 23.7° |
| 2031-06-14 Sat | 5 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.1° 09:25 | 4.47 | 22% | 17.5° |
| 2031-06-15 Sun | 5 | — | unknown | 04:00–04:30 (marginal, 0.5 h) | 79.1° 09:20 | 4.46 | 14% | 19.0° |
| 2031-06-16 Mon | 7 | — | unknown | 03:50–04:30 (marginal, 0.67 h) | 79.1° 09:15 | 4.44 | 8% | 26.7° |
| 2031-06-17 Tue | 8 | — | unknown | 03:45–04:30 (marginal, 0.75 h) | 79.1° 09:10 | 4.44 | 4% | 36.7° |
| 2031-06-18 Wed | 9 | — | unknown | 03:10–04:30 (marginal, 1.33 h) | 79.1° 09:10 | 4.43 | 1% | 47.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-05-20&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.