← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-03-31 Tue | 7 | 10 | 1 | — | 42.9° 18:20 | 8.14 | 99% | 93.3° |
| 2026-04-01 Wed | 8 | 0 | 0 | — | 42.9° 18:20 | 8.08 | 100% | 103.8° |
| 2026-04-02 Thu | 8 | 0 | 0 | — | 42.9° 18:15 | 8.03 | 99% | 114.0° |
| 2026-04-03 Fri | 8 | 0 | 0 | — | 42.9° 18:10 | 7.97 | 96% | 123.5° |
| 2026-04-04 Sat | 7 | 0 | 0 | — | 42.9° 18:05 | 7.92 | 92% | 132.1° |
| 2026-04-05 Sun | 6 | 89 | 5 | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.86 | 86% | 139.3° |
| 2026-04-06 Mon | 5 | 80 | 4 | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.8 | 79% | 144.4° |
| 2026-04-07 Tue | 3 | 19 | 1 | — | 42.9° 17:55 | 7.75 | 71% | 146.3° |
| 2026-04-08 Wed | 3 | 100 | 3 | 21:00–21:10 (marginal, 0.17 h) | 42.9° 17:50 | 7.69 | 62% | 144.7° |
| 2026-04-09 Thu | 2 | 15 | 0 | — | 42.9° 17:45 | 7.64 | 53% | 139.9° |
| 2026-04-10 Fri | 1 | 0 | 0 | — | 42.9° 17:40 | 7.58 | 43% | 132.8° |
| 2026-04-11 Sat | 1 | 49 | 0 | — | 42.9° 17:40 | 7.52 | 33% | 124.1° |
| 2026-04-12 Sun | 1 | 15 | 0 | — | 42.9° 17:35 | 7.47 | 24% | 114.3° |
| 2026-04-13 Mon | 1 | 0 | 0 | — | 42.9° 17:30 | 7.41 | 16% | 103.6° |
| 2026-04-14 Tue | 1 | 0 | 0 | — | 42.9° 17:25 | 7.35 | 9% | 92.4° |
| 2026-04-15 Wed | 0 | 0 | 0 | — | 42.9° 17:25 | 7.29 | 3% | 80.7° |
| 2026-04-16 Thu | 0 | 0 | 0 | — | 42.9° 17:20 | 7.24 | 0% | 69.0° |
| 2026-04-17 Fri | 0 | 100 | 0 | — | 42.9° 17:15 | 7.18 | 0% | 57.5° |
| 2026-04-18 Sat | 0 | 78 | 0 | — | 42.9° 17:10 | 7.12 | 3% | 46.9° |
| 2026-04-19 Sun | 0 | 98 | 0 | — | 42.9° 17:05 | 7.06 | 9% | 38.5° |
| 2026-04-20 Mon | 0 | 0 | 0 | — | 42.9° 17:05 | 7.0 | 16% | 34.0° |
| 2026-04-21 Tue | 0 | 0 | 0 | — | 42.9° 17:00 | 6.95 | 26% | 34.7° |
| 2026-04-22 Wed | 0 | 0 | 0 | — | 42.9° 16:55 | 6.89 | 37% | 40.2° |
| 2026-04-23 Thu | 0 | 0 | 0 | — | 42.9° 16:50 | 6.83 | 48% | 48.7° |
| 2026-04-24 Fri | 0 | 0 | 0 | — | 42.9° 16:45 | 6.77 | 59% | 58.6° |
| 2026-04-25 Sat | 0 | 0 | 0 | — | 42.9° 16:45 | 6.71 | 69% | 69.1° |
| 2026-04-26 Sun | 0 | 0 | 0 | — | 42.9° 16:40 | 6.65 | 78% | 79.8° |
| 2026-04-27 Mon | 0 | 0 | 0 | — | 42.9° 16:35 | 6.6 | 86% | 90.5° |
| 2026-04-28 Tue | 0 | 0 | 0 | — | 42.9° 16:30 | 6.54 | 92% | 101.0° |
| 2026-04-29 Wed | 0 | 0 | 0 | — | 42.9° 16:30 | 6.48 | 97% | 111.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-03-31&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.