← 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. |
|---|---|---|---|---|---|---|---|---|
| 2039-03-20 Sun | 34 | — | unknown | 20:10–21:30 (good, 1.33 h) | 72.5° 16:20 | 8.73 | 15% | 105.4° |
| 2039-03-21 Mon | 32 | — | unknown | 20:10–21:25 (good, 1.25 h) | 72.5° 16:15 | 8.68 | 8% | 92.3° |
| 2039-03-22 Tue | 31 | — | unknown | 20:10–21:20 (good, 1.17 h) | 72.5° 16:10 | 8.63 | 4% | 79.4° |
| 2039-03-23 Wed | 29 | — | unknown | 20:10–21:15 (good, 1.08 h) | 72.5° 16:05 | 8.57 | 1% | 66.7° |
| 2039-03-24 Thu | 27 | — | unknown | 20:15–21:15 (good, 1.0 h) | 72.5° 16:00 | 8.52 | 0% | 54.2° |
| 2039-03-25 Fri | 25 | — | unknown | 20:15–21:10 (good, 0.92 h) | 72.5° 16:00 | 8.47 | 2% | 41.9° |
| 2039-03-26 Sat | 24 | — | unknown | 20:15–21:05 (good, 0.83 h) | 72.5° 15:55 | 8.42 | 5% | 30.0° |
| 2039-03-27 Sun | 20 | — | unknown | 21:20–22:00 (good, 0.67 h) | 72.5° 16:50 | 8.36 | 10% | 18.4° |
| 2039-03-28 Mon | 17 | — | unknown | 21:20–21:50 (good, 0.5 h) | 72.5° 16:45 | 8.31 | 16% | 8.3° |
| 2039-03-29 Tue | 14 | — | unknown | 21:20–21:40 (good, 0.33 h) | 72.5° 16:40 | 8.25 | 23% | 9.0° |
| 2039-03-30 Wed | 11 | — | unknown | 21:20–21:30 (good, 0.17 h) | 72.5° 16:40 | 8.2 | 32% | 19.3° |
| 2039-03-31 Thu | 7 | — | unknown | 21:25–22:10 (marginal, 0.75 h) | 72.5° 16:35 | 8.15 | 41% | 30.7° |
| 2039-04-01 Fri | 6 | — | unknown | 21:25–22:05 (marginal, 0.67 h) | 72.5° 16:30 | 8.09 | 50% | 42.5° |
| 2039-04-02 Sat | 5 | — | unknown | 21:25–21:55 (marginal, 0.5 h) | 72.5° 16:25 | 8.04 | 60% | 54.7° |
| 2039-04-03 Sun | 4 | — | unknown | 21:25–21:50 (marginal, 0.42 h) | 72.5° 16:25 | 7.98 | 70% | 67.2° |
| 2039-04-04 Mon | 3 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:20 | 7.93 | 79% | 80.0° |
| 2039-04-05 Tue | 3 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:15 | 7.87 | 87% | 93.4° |
| 2039-04-06 Wed | 4 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:10 | 7.81 | 93% | 107.1° |
| 2039-04-07 Thu | 3 | — | unknown | 21:35–21:45 (marginal, 0.17 h) | 72.5° 16:05 | 7.76 | 98% | 121.3° |
| 2039-04-08 Fri | 2 | — | unknown | 21:35–21:40 (marginal, 0.08 h) | 72.5° 16:05 | 7.7 | 100% | 135.8° |
| 2039-04-09 Sat | 2 | — | unknown | 21:35–21:40 (marginal, 0.08 h) | 72.5° 16:00 | 7.64 | 99% | 150.4° |
| 2039-04-10 Sun | 2 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:55 | 7.59 | 95% | 164.6° |
| 2039-04-11 Mon | 1 | — | unknown | — | 72.5° 15:50 | 7.53 | 89% | 173.8° |
| 2039-04-12 Tue | 1 | — | unknown | — | 72.5° 15:45 | 7.47 | 80% | 163.3° |
| 2039-04-13 Wed | 1 | — | unknown | — | 72.5° 15:45 | 7.42 | 70% | 149.4° |
| 2039-04-14 Thu | 1 | — | unknown | — | 72.5° 15:40 | 7.36 | 59% | 135.5° |
| 2039-04-15 Fri | 0 | — | unknown | — | 72.5° 15:35 | 7.3 | 48% | 121.8° |
| 2039-04-16 Sat | 0 | — | unknown | — | 72.5° 15:30 | 7.24 | 37% | 108.5° |
| 2039-04-17 Sun | 0 | — | unknown | — | 72.5° 15:30 | 7.19 | 27% | 95.4° |
| 2039-04-18 Mon | 0 | — | unknown | — | 72.5° 15:25 | 7.13 | 19% | 82.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2039-03-20&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.