← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-03-20 Thu | 1 | — | unknown | 19:35–19:40 (marginal, 0.08 h) | 79.1° 14:05 | 8.73 | 6% | 61.7° |
| 2031-03-21 Fri | 1 | — | unknown | — | 79.1° 14:00 | 8.68 | 2% | 48.7° |
| 2031-03-22 Sat | 1 | — | unknown | — | 79.1° 13:55 | 8.63 | 0% | 36.3° |
| 2031-03-23 Sun | 1 | — | unknown | — | 79.1° 13:55 | 8.58 | 1% | 25.4° |
| 2031-03-24 Mon | 0 | — | unknown | — | 79.1° 13:50 | 8.52 | 4% | 18.1° |
| 2031-03-25 Tue | 0 | — | unknown | — | 79.1° 13:45 | 8.47 | 8% | 18.3° |
| 2031-03-26 Wed | 0 | — | unknown | — | 79.1° 13:40 | 8.42 | 15% | 25.6° |
| 2031-03-27 Thu | 0 | — | unknown | — | 79.1° 13:40 | 8.36 | 22% | 35.5° |
| 2031-03-28 Fri | 0 | — | unknown | — | 79.1° 13:35 | 8.31 | 31% | 46.3° |
| 2031-03-29 Sat | 0 | — | unknown | — | 79.1° 13:30 | 8.26 | 40% | 57.3° |
| 2031-03-30 Sun | 0 | — | unknown | — | 79.1° 14:25 | 8.2 | 49% | 68.5° |
| 2031-03-31 Mon | 0 | — | unknown | — | 79.1° 14:20 | 8.15 | 59% | 79.8° |
| 2031-04-01 Tue | 0 | — | unknown | — | 79.1° 14:20 | 8.09 | 68% | 91.2° |
| 2031-04-02 Wed | 0 | — | unknown | — | 79.1° 14:15 | 8.04 | 76% | 102.8° |
| 2031-04-03 Thu | 0 | — | unknown | — | 79.1° 14:10 | 7.98 | 84% | 114.6° |
| 2031-04-04 Fri | 0 | — | unknown | — | 79.1° 14:05 | 7.93 | 91% | 126.6° |
| 2031-04-05 Sat | 0 | — | unknown | — | 79.1° 14:00 | 7.87 | 96% | 138.5° |
| 2031-04-06 Sun | 0 | — | unknown | — | 79.1° 14:00 | 7.82 | 99% | 150.1° |
| 2031-04-07 Mon | 0 | — | unknown | — | 79.1° 13:55 | 7.76 | 100% | 159.6° |
| 2031-04-08 Tue | 0 | — | unknown | — | 79.1° 13:50 | 7.7 | 98% | 162.7° |
| 2031-04-09 Wed | 0 | — | unknown | — | 79.1° 13:45 | 7.65 | 94% | 156.1° |
| 2031-04-10 Thu | 0 | — | unknown | — | 79.1° 13:45 | 7.59 | 87% | 144.8° |
| 2031-04-11 Fri | 0 | — | unknown | — | 79.1° 13:40 | 7.53 | 78% | 132.0° |
| 2031-04-12 Sat | 0 | — | unknown | — | 79.1° 13:35 | 7.48 | 68% | 118.6° |
| 2031-04-13 Sun | 0 | — | unknown | — | 79.1° 13:30 | 7.42 | 57% | 105.1° |
| 2031-04-14 Mon | 0 | — | unknown | — | 79.1° 13:25 | 7.36 | 46% | 91.7° |
| 2031-04-15 Tue | 0 | — | unknown | — | 79.1° 13:25 | 7.31 | 34% | 78.3° |
| 2031-04-16 Wed | 0 | — | unknown | — | 79.1° 13:20 | 7.25 | 24% | 65.1° |
| 2031-04-17 Thu | 0 | — | unknown | — | 79.1° 13:15 | 7.19 | 16% | 52.3° |
| 2031-04-18 Fri | 0 | — | unknown | — | 79.1° 13:10 | 7.13 | 8% | 40.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-03-20&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.