← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-04-01 Wed | 64 | 0 | 0 | — | 87.1° 07:15 | 8.08 | 100% | 94.8° |
| 2026-04-02 Thu | 60 | 0 | 0 | — | 87.1° 07:15 | 8.03 | 99% | 89.6° |
| 2026-04-03 Fri | 57 | 0 | 0 | — | 87.1° 07:10 | 7.97 | 96% | 84.6° |
| 2026-04-04 Sat | 57 | 20 | 12 | — | 87.1° 07:05 | 7.92 | 92% | 79.8° |
| 2026-04-05 Sun | 58 | 83 | 48 | 04:00–05:20 (good, 1.33 h) | 87.1° 07:00 | 7.86 | 86% | 75.5° |
| 2026-04-06 Mon | 63 | 94 | 59 | 01:30–05:00 (good, 3.5 h) | 87.1° 06:55 | 7.8 | 79% | 71.8° |
| 2026-04-07 Tue | 77 | 59 | 45 | 04:00–05:20 (good, 1.33 h) | 87.1° 06:55 | 7.75 | 71% | 68.9° |
| 2026-04-08 Wed | 87 | 2 | 1 | — | 87.1° 06:50 | 7.69 | 62% | 66.8° |
| 2026-04-09 Thu | 94 | 33 | 31 | 00:20–03:00 (marginal, 2.67 h) | 87.1° 06:45 | 7.64 | 53% | 65.8° |
| 2026-04-10 Fri | 98 | 0 | 0 | — | 87.1° 06:40 | 7.58 | 43% | 65.9° |
| 2026-04-11 Sat | 100 | 24 | 24 | 01:30–02:00 (good, 0.5 h) | 87.1° 06:35 | 7.52 | 33% | 67.1° |
| 2026-04-12 Sun | 100 | 4 | 4 | — | 87.1° 06:35 | 7.47 | 24% | 69.6° |
| 2026-04-13 Mon | 100 | 0 | 0 | — | 87.1° 06:30 | 7.41 | 16% | 73.1° |
| 2026-04-14 Tue | 100 | 21 | 21 | 02:00–03:00 (good, 1.0 h) | 87.1° 06:25 | 7.35 | 9% | 77.7° |
| 2026-04-15 Wed | 100 | 0 | 0 | — | 87.1° 06:20 | 7.29 | 3% | 83.0° |
| 2026-04-16 Thu | 100 | 22 | 22 | 04:00–05:35 (marginal, 1.58 h) | 87.1° 06:20 | 7.24 | 0% | 88.9° |
| 2026-04-17 Fri | 100 | 95 | 95 | 00:25–05:00 (good, 4.58 h) | 87.1° 06:15 | 7.18 | 0% | 94.9° |
| 2026-04-18 Sat | 100 | 92 | 92 | 00:40–04:55 (good, 4.25 h) | 87.1° 06:10 | 7.12 | 3% | 100.7° |
| 2026-04-19 Sun | 100 | 83 | 83 | 01:00–04:55 (good, 3.92 h) | 87.1° 06:05 | 7.06 | 9% | 105.9° |
| 2026-04-20 Mon | 100 | 81 | 81 | 01:00–04:50 (good, 3.83 h) | 87.1° 06:00 | 7.0 | 16% | 110.1° |
| 2026-04-21 Tue | 100 | 0 | 0 | — | 87.1° 06:00 | 6.95 | 26% | 113.0° |
| 2026-04-22 Wed | 100 | 0 | 0 | — | 87.1° 05:55 | 6.89 | 37% | 114.3° |
| 2026-04-23 Thu | 100 | 74 | 74 | 00:05–04:00 (good, 3.92 h) | 87.1° 05:50 | 6.83 | 48% | 114.1° |
| 2026-04-24 Fri | 100 | 82 | 82 | 01:00–04:45 (good, 3.75 h) | 87.1° 05:45 | 6.77 | 59% | 112.4° |
| 2026-04-25 Sat | 100 | 91 | 91 | 00:25–04:45 (good, 4.33 h) | 87.1° 05:40 | 6.71 | 69% | 109.5° |
| 2026-04-26 Sun | 100 | 100 | 100 | 00:05–04:40 (good, 4.58 h) | 87.1° 05:40 | 6.65 | 78% | 105.6° |
| 2026-04-27 Mon | 100 | 72 | 72 | 01:00–03:00 (good, 2.0 h) | 87.1° 05:35 | 6.6 | 86% | 101.1° |
| 2026-04-28 Tue | 84 | 64 | 54 | 04:00–04:35 (good, 0.58 h) | 87.1° 05:30 | 6.54 | 92% | 96.2° |
| 2026-04-29 Wed | 80 | 38 | 31 | 23:20–02:00 (marginal, 2.67 h) | 87.1° 05:25 | 6.48 | 97% | 91.1° |
| 2026-04-30 Thu | 74 | 0 | 0 | — | 87.1° 05:25 | 6.42 | 99% | 86.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-04-01&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.