← 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. |
|---|---|---|---|---|---|---|---|---|
| 2030-03-18 Mon | 17 | — | unknown | 20:05–21:55 (marginal, 1.83 h) | 42.9° 18:15 | 8.82 | 99% | 82.8° |
| 2030-03-19 Tue | 20 | — | unknown | 20:10–21:00 (good, 0.83 h) | 42.9° 18:10 | 8.77 | 100% | 95.5° |
| 2030-03-20 Wed | 24 | — | unknown | 20:10–21:05 (good, 0.92 h) | 42.9° 18:05 | 8.72 | 98% | 108.3° |
| 2030-03-21 Thu | 30 | — | unknown | 20:10–21:10 (good, 1.0 h) | 42.9° 18:00 | 8.67 | 93% | 120.9° |
| 2030-03-22 Fri | 28 | — | unknown | 20:10–21:15 (good, 1.08 h) | 42.9° 17:55 | 8.62 | 86% | 132.7° |
| 2030-03-23 Sat | 27 | — | unknown | 20:15–21:10 (good, 0.92 h) | 42.9° 17:55 | 8.56 | 77% | 142.9° |
| 2030-03-24 Sun | 25 | — | unknown | 20:15–21:10 (good, 0.92 h) | 42.9° 17:50 | 8.51 | 66% | 150.0° |
| 2030-03-25 Mon | 24 | — | unknown | 20:15–21:05 (good, 0.83 h) | 42.9° 17:45 | 8.46 | 55% | 151.6° |
| 2030-03-26 Tue | 22 | — | unknown | 20:15–21:00 (good, 0.75 h) | 42.9° 17:40 | 8.41 | 44% | 147.2° |
| 2030-03-27 Wed | 20 | — | unknown | 20:20–20:55 (good, 0.58 h) | 42.9° 17:35 | 8.35 | 34% | 139.1° |
| 2030-03-28 Thu | 19 | — | unknown | 20:20–20:55 (good, 0.58 h) | 42.9° 17:35 | 8.3 | 24% | 129.2° |
| 2030-03-29 Fri | 17 | — | unknown | 20:20–20:50 (good, 0.5 h) | 42.9° 17:30 | 8.24 | 16% | 118.4° |
| 2030-03-30 Sat | 15 | — | unknown | 20:20–20:45 (good, 0.42 h) | 42.9° 17:25 | 8.19 | 9% | 107.4° |
| 2030-03-31 Sun | 12 | — | unknown | 21:25–21:40 (good, 0.25 h) | 42.9° 18:20 | 8.14 | 4% | 96.3° |
| 2030-04-01 Mon | 11 | — | unknown | 21:25–21:35 (good, 0.17 h) | 42.9° 18:20 | 8.08 | 1% | 85.3° |
| 2030-04-02 Tue | 10 | — | unknown | 21:25–21:35 (good, 0.17 h) | 42.9° 18:15 | 8.03 | 0% | 74.5° |
| 2030-04-03 Wed | 8 | — | unknown | 21:25–21:30 (good, 0.08 h) | 42.9° 18:10 | 7.97 | 1% | 64.1° |
| 2030-04-04 Thu | 6 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 42.9° 18:05 | 7.91 | 4% | 54.1° |
| 2030-04-05 Fri | 5 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.86 | 8% | 44.8° |
| 2030-04-06 Sat | 4 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.8 | 14% | 36.7° |
| 2030-04-07 Sun | 3 | — | unknown | 21:35–21:45 (marginal, 0.17 h) | 42.9° 17:55 | 7.75 | 21% | 30.6° |
| 2030-04-08 Mon | 2 | — | unknown | 21:35–21:40 (marginal, 0.08 h) | 42.9° 17:50 | 7.69 | 29% | 28.1° |
| 2030-04-09 Tue | 1 | — | unknown | — | 42.9° 17:45 | 7.63 | 38% | 30.1° |
| 2030-04-10 Wed | 1 | — | unknown | — | 42.9° 17:40 | 7.58 | 48% | 35.9° |
| 2030-04-11 Thu | 0 | — | unknown | — | 42.9° 17:40 | 7.52 | 58% | 44.3° |
| 2030-04-12 Fri | 0 | — | unknown | — | 42.9° 17:35 | 7.46 | 68% | 54.3° |
| 2030-04-13 Sat | 0 | — | unknown | — | 42.9° 17:30 | 7.41 | 77% | 65.4° |
| 2030-04-14 Sun | 0 | — | unknown | — | 42.9° 17:25 | 7.35 | 86% | 77.2° |
| 2030-04-15 Mon | 0 | — | unknown | — | 42.9° 17:25 | 7.29 | 93% | 89.7° |
| 2030-04-16 Tue | 0 | — | unknown | — | 42.9° 17:20 | 7.23 | 98% | 102.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-03-18&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.