← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-04-04 Fri | 4 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 72.5° 16:20 | 7.93 | 91% | 100.9° |
| 2031-04-05 Sat | 5 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 72.5° 16:15 | 7.87 | 96% | 113.9° |
| 2031-04-06 Sun | 4 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:10 | 7.82 | 99% | 127.3° |
| 2031-04-07 Mon | 3 | — | unknown | 20:55–21:10 (marginal, 0.25 h) | 72.5° 16:05 | 7.76 | 100% | 140.9° |
| 2031-04-08 Tue | 3 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 72.5° 16:05 | 7.7 | 98% | 154.8° |
| 2031-04-09 Wed | 2 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 72.5° 16:00 | 7.65 | 94% | 168.5° |
| 2031-04-10 Thu | 2 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:55 | 7.59 | 87% | 174.5° |
| 2031-04-11 Fri | 1 | — | unknown | — | 72.5° 15:50 | 7.53 | 78% | 161.6° |
| 2031-04-12 Sat | 1 | — | unknown | — | 72.5° 15:45 | 7.48 | 68% | 147.5° |
| 2031-04-13 Sun | 1 | — | unknown | — | 72.5° 15:45 | 7.42 | 57% | 133.4° |
| 2031-04-14 Mon | 1 | — | unknown | — | 72.5° 15:40 | 7.36 | 46% | 119.3° |
| 2031-04-15 Tue | 0 | — | unknown | — | 72.5° 15:35 | 7.31 | 34% | 105.4° |
| 2031-04-16 Wed | 0 | — | unknown | — | 72.5° 15:30 | 7.25 | 24% | 91.6° |
| 2031-04-17 Thu | 0 | — | unknown | — | 72.5° 15:30 | 7.19 | 16% | 78.0° |
| 2031-04-18 Fri | 0 | — | unknown | — | 72.5° 15:25 | 7.13 | 8% | 64.5° |
| 2031-04-19 Sat | 0 | — | unknown | — | 72.5° 15:20 | 7.07 | 4% | 51.3° |
| 2031-04-20 Sun | 0 | — | unknown | — | 72.5° 15:15 | 7.02 | 1% | 38.3° |
| 2031-04-21 Mon | 0 | — | unknown | — | 72.5° 15:10 | 6.96 | 0% | 25.6° |
| 2031-04-22 Tue | 0 | — | unknown | — | 72.5° 15:10 | 6.9 | 2% | 13.3° |
| 2031-04-23 Wed | 0 | — | unknown | — | 72.5° 15:05 | 6.84 | 5% | 4.3° |
| 2031-04-24 Thu | 0 | — | unknown | — | 72.5° 15:00 | 6.78 | 10% | 12.7° |
| 2031-04-25 Fri | 0 | — | unknown | — | 72.5° 14:55 | 6.72 | 16% | 24.3° |
| 2031-04-26 Sat | 0 | — | unknown | — | 72.5° 14:50 | 6.67 | 24% | 36.1° |
| 2031-04-27 Sun | 0 | — | unknown | — | 72.5° 14:50 | 6.61 | 32% | 47.8° |
| 2031-04-28 Mon | 0 | — | unknown | — | 72.5° 14:45 | 6.55 | 42% | 59.6° |
| 2031-04-29 Tue | 0 | — | unknown | — | 72.5° 14:40 | 6.49 | 51% | 71.5° |
| 2031-04-30 Wed | 0 | — | unknown | — | 72.5° 14:35 | 6.43 | 61% | 83.6° |
| 2031-05-01 Thu | 0 | — | unknown | — | 72.5° 14:30 | 6.38 | 70% | 96.0° |
| 2031-05-02 Fri | 0 | — | unknown | — | 72.5° 14:30 | 6.32 | 79% | 108.7° |
| 2031-05-03 Sat | 0 | — | unknown | — | 72.5° 14:25 | 6.26 | 87% | 121.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-04-04&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.