← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-03-20 Thu | 31 | 100 | 31 | 20:10–21:25 (good, 1.25 h) | 42.9° 18:05 | 8.71 | 65% | 144.9° |
| 2025-03-21 Fri | 30 | 100 | 30 | 20:10–21:20 (good, 1.17 h) | 42.9° 18:00 | 8.66 | 55% | 146.0° |
| 2025-03-22 Sat | 28 | 0 | 0 | — | 42.9° 17:55 | 8.61 | 45% | 143.2° |
| 2025-03-23 Sun | 26 | 0 | 0 | — | 42.9° 17:50 | 8.55 | 35% | 137.2° |
| 2025-03-24 Mon | 25 | 0 | 0 | — | 42.9° 17:50 | 8.5 | 26% | 128.7° |
| 2025-03-25 Tue | 24 | 0 | 0 | — | 42.9° 17:45 | 8.45 | 17% | 118.6° |
| 2025-03-26 Wed | 22 | 29 | 6 | 20:15–20:55 (marginal, 0.67 h) | 42.9° 17:40 | 8.39 | 9% | 107.4° |
| 2025-03-27 Thu | 19 | 0 | 0 | — | 42.9° 17:35 | 8.34 | 3% | 95.4° |
| 2025-03-28 Fri | 18 | 0 | 0 | — | 42.9° 17:30 | 8.29 | 0% | 83.0° |
| 2025-03-29 Sat | 17 | 6 | 1 | — | 42.9° 17:30 | 8.23 | 0% | 70.6° |
| 2025-03-30 Sun | 14 | 0 | 0 | — | 42.9° 18:25 | 8.18 | 3% | 58.7° |
| 2025-03-31 Mon | 11 | 11 | 1 | — | 42.9° 18:20 | 8.12 | 9% | 48.0° |
| 2025-04-01 Tue | 9 | 0 | 0 | — | 42.9° 18:15 | 8.07 | 17% | 39.4° |
| 2025-04-02 Wed | 7 | 0 | 0 | — | 42.9° 18:15 | 8.01 | 27% | 34.6° |
| 2025-04-03 Thu | 4 | 0 | 0 | — | 42.9° 18:10 | 7.96 | 37% | 34.6° |
| 2025-04-04 Fri | 3 | 49 | 1 | — | 42.9° 18:05 | 7.9 | 48% | 39.0° |
| 2025-04-05 Sat | 2 | 91 | 2 | 21:30–21:35 (marginal, 0.08 h) | 42.9° 18:00 | 7.85 | 59% | 46.4° |
| 2025-04-06 Sun | 2 | 0 | 0 | — | 42.9° 17:55 | 7.79 | 69% | 55.3° |
| 2025-04-07 Mon | 1 | 100 | 1 | — | 42.9° 17:55 | 7.74 | 78% | 64.9° |
| 2025-04-08 Tue | 1 | 0 | 0 | — | 42.9° 17:50 | 7.68 | 85% | 74.8° |
| 2025-04-09 Wed | 1 | 92 | 1 | — | 42.9° 17:45 | 7.62 | 92% | 84.9° |
| 2025-04-10 Thu | 1 | 0 | 0 | — | 42.9° 17:40 | 7.57 | 96% | 94.9° |
| 2025-04-11 Fri | 1 | 0 | 0 | — | 42.9° 17:35 | 7.51 | 99% | 104.7° |
| 2025-04-12 Sat | 1 | 0 | 0 | — | 42.9° 17:35 | 7.45 | 100% | 114.3° |
| 2025-04-13 Sun | 1 | 100 | 1 | — | 42.9° 17:30 | 7.39 | 99% | 123.4° |
| 2025-04-14 Mon | 0 | 0 | 0 | — | 42.9° 17:25 | 7.34 | 97% | 131.8° |
| 2025-04-15 Tue | 0 | 0 | 0 | — | 42.9° 17:20 | 7.28 | 92% | 138.9° |
| 2025-04-16 Wed | 0 | 88 | 0 | — | 42.9° 17:20 | 7.22 | 87% | 144.0° |
| 2025-04-17 Thu | 0 | 59 | 0 | — | 42.9° 17:15 | 7.16 | 79% | 146.1° |
| 2025-04-18 Fri | 0 | 93 | 0 | — | 42.9° 17:10 | 7.11 | 71% | 144.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-03-20&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.