← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-05-07 Wed | 0 | — | unknown | — | 79.1° 11:55 | 6.03 | 99% | 149.2° |
| 2031-05-08 Thu | 0 | — | unknown | — | 79.1° 11:50 | 5.97 | 96% | 136.4° |
| 2031-05-09 Fri | 0 | — | unknown | — | 79.1° 11:45 | 5.92 | 89% | 122.7° |
| 2031-05-10 Sat | 0 | — | unknown | — | 79.1° 11:40 | 5.86 | 81% | 108.8° |
| 2031-05-11 Sun | 0 | — | unknown | — | 79.1° 11:35 | 5.81 | 71% | 95.0° |
| 2031-05-12 Mon | 0 | — | unknown | — | 79.1° 11:35 | 5.75 | 60% | 81.4° |
| 2031-05-13 Tue | 0 | — | unknown | — | 79.1° 11:30 | 5.7 | 48% | 68.1° |
| 2031-05-14 Wed | 0 | — | unknown | — | 79.1° 11:25 | 5.64 | 38% | 55.2° |
| 2031-05-15 Thu | 0 | — | unknown | — | 79.1° 11:20 | 5.59 | 27% | 42.8° |
| 2031-05-16 Fri | 0 | — | unknown | — | 79.1° 11:15 | 5.54 | 18% | 31.4° |
| 2031-05-17 Sat | 0 | — | unknown | — | 79.1° 11:15 | 5.48 | 11% | 21.8° |
| 2031-05-18 Sun | 0 | — | unknown | — | 79.1° 11:10 | 5.43 | 6% | 17.1° |
| 2031-05-19 Mon | 0 | — | unknown | — | 79.1° 11:05 | 5.38 | 2% | 20.5° |
| 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° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-05-07&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.