← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-04-02 Mon | 10 | — | unknown | 21:25–21:35 (good, 0.17 h) | 72.5° 16:25 | 7.99 | 68% | 157.6° |
| 2040-04-03 Tue | 8 | — | unknown | 20:55–22:00 (marginal, 1.08 h) | 72.5° 16:20 | 7.94 | 57% | 143.7° |
| 2040-04-04 Wed | 7 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 72.5° 16:15 | 7.88 | 46% | 129.6° |
| 2040-04-05 Thu | 6 | — | unknown | 20:55–21:25 (marginal, 0.5 h) | 72.5° 16:10 | 7.83 | 35% | 115.6° |
| 2040-04-06 Fri | 5 | — | unknown | 20:55–21:20 (marginal, 0.42 h) | 72.5° 16:10 | 7.77 | 24% | 101.5° |
| 2040-04-07 Sat | 3 | — | unknown | 21:00–21:15 (marginal, 0.25 h) | 72.5° 16:05 | 7.72 | 16% | 87.6° |
| 2040-04-08 Sun | 3 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 72.5° 16:00 | 7.66 | 8% | 73.8° |
| 2040-04-09 Mon | 2 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:55 | 7.6 | 3% | 60.2° |
| 2040-04-10 Tue | 1 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:50 | 7.55 | 1% | 46.8° |
| 2040-04-11 Wed | 1 | — | unknown | — | 72.5° 15:50 | 7.49 | 0% | 33.7° |
| 2040-04-12 Thu | 1 | — | unknown | — | 72.5° 15:45 | 7.43 | 2% | 20.9° |
| 2040-04-13 Fri | 1 | — | unknown | — | 72.5° 15:40 | 7.37 | 6% | 9.0° |
| 2040-04-14 Sat | 0 | — | unknown | — | 72.5° 15:35 | 7.32 | 11% | 6.4° |
| 2040-04-15 Sun | 0 | — | unknown | — | 72.5° 15:35 | 7.26 | 18% | 17.4° |
| 2040-04-16 Mon | 0 | — | unknown | — | 72.5° 15:30 | 7.2 | 26% | 29.1° |
| 2040-04-17 Tue | 0 | — | unknown | — | 72.5° 15:25 | 7.14 | 35% | 40.9° |
| 2040-04-18 Wed | 0 | — | unknown | — | 72.5° 15:20 | 7.08 | 44% | 52.6° |
| 2040-04-19 Thu | 0 | — | unknown | — | 72.5° 15:15 | 7.03 | 54% | 64.5° |
| 2040-04-20 Fri | 0 | — | unknown | — | 72.5° 15:15 | 6.97 | 63% | 76.4° |
| 2040-04-21 Sat | 0 | — | unknown | — | 72.5° 15:10 | 6.91 | 72% | 88.6° |
| 2040-04-22 Sun | 0 | — | unknown | — | 72.5° 15:05 | 6.85 | 81% | 101.1° |
| 2040-04-23 Mon | 0 | — | unknown | — | 72.5° 15:00 | 6.79 | 88% | 113.8° |
| 2040-04-24 Tue | 0 | — | unknown | — | 72.5° 14:55 | 6.74 | 94% | 127.0° |
| 2040-04-25 Wed | 0 | — | unknown | — | 72.5° 14:55 | 6.68 | 98% | 140.5° |
| 2040-04-26 Thu | 0 | — | unknown | — | 72.5° 14:50 | 6.62 | 100% | 154.3° |
| 2040-04-27 Fri | 0 | — | unknown | — | 72.5° 14:45 | 6.56 | 99% | 168.0° |
| 2040-04-28 Sat | 0 | — | unknown | — | 72.5° 14:40 | 6.5 | 96% | 174.4° |
| 2040-04-29 Sun | 0 | — | unknown | — | 72.5° 14:40 | 6.44 | 90% | 161.6° |
| 2040-04-30 Mon | 0 | — | unknown | — | 72.5° 14:35 | 6.39 | 81% | 147.4° |
| 2040-05-01 Tue | 0 | — | unknown | — | 72.5° 14:30 | 6.33 | 71% | 133.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-04-02&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.