← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-03-27 Fri | 77 | 10 | 8 | 02:00–03:00 (marginal, 1.0 h) | 50.2° 00:30 | 8.35 | 73% | 61.1° |
| 2026-03-28 Sat | 54 | 6 | 3 | — | 50.2° 00:25 | 8.3 | 82% | 47.6° |
| 2026-03-29 Sun | 36 | 0 | 0 | — | 50.2° 01:20 | 8.25 | 90% | 34.5° |
| 2026-03-30 Mon | 27 | 2 | 1 | — | 50.2° 01:20 | 8.19 | 95% | 21.8° |
| 2026-03-31 Tue | 24 | 4 | 1 | — | 50.2° 01:15 | 8.14 | 99% | 10.5° |
| 2026-04-01 Wed | 24 | 0 | 0 | — | 50.2° 01:10 | 8.08 | 100% | 8.7° |
| 2026-04-02 Thu | 30 | 0 | 0 | — | 50.2° 01:05 | 8.03 | 99% | 19.0° |
| 2026-04-03 Fri | 65 | 0 | 0 | — | 50.2° 01:05 | 7.97 | 96% | 30.7° |
| 2026-04-04 Sat | 86 | 28 | 24 | 00:00–01:00 (marginal, 1.0 h) | 50.2° 01:00 | 7.92 | 92% | 42.6° |
| 2026-04-05 Sun | 91 | 73 | 66 | 21:30–23:00 (good, 1.5 h) | 50.2° 00:55 | 7.86 | 86% | 54.4° |
| 2026-04-06 Mon | 93 | 73 | 68 | 00:00–03:45 (good, 3.75 h) | 50.2° 00:50 | 7.8 | 79% | 66.2° |
| 2026-04-07 Tue | 93 | 38 | 36 | 00:00–01:00 (good, 1.0 h) | 50.2° 00:45 | 7.75 | 71% | 77.9° |
| 2026-04-08 Wed | 93 | 35 | 32 | 21:35–00:00 (good, 2.42 h) | 50.2° 00:45 | 7.69 | 62% | 89.6° |
| 2026-04-09 Thu | 93 | 59 | 55 | 22:00–02:00 (good, 4.0 h) | 50.2° 00:40 | 7.64 | 53% | 101.5° |
| 2026-04-10 Fri | 93 | 0 | 0 | — | 50.2° 00:35 | 7.58 | 43% | 113.5° |
| 2026-04-11 Sat | 93 | 51 | 48 | 22:00–02:00 (good, 4.0 h) | 50.2° 00:30 | 7.52 | 33% | 125.8° |
| 2026-04-12 Sun | 93 | 34 | 32 | 22:00–00:00 (good, 2.0 h) | 50.2° 00:25 | 7.47 | 24% | 138.3° |
| 2026-04-13 Mon | 93 | 2 | 2 | — | 50.2° 00:25 | 7.41 | 16% | 151.1° |
| 2026-04-14 Tue | 93 | 16 | 15 | 02:00–03:00 (good, 1.0 h) | 50.2° 00:20 | 7.35 | 9% | 163.9° |
| 2026-04-15 Wed | 93 | 0 | 0 | — | 50.2° 00:15 | 7.29 | 3% | 172.8° |
| 2026-04-16 Thu | 93 | 6 | 5 | — | 50.2° 00:10 | 7.24 | 0% | 164.3° |
| 2026-04-17 Fri | 93 | 97 | 90 | 21:45–04:00 (good, 6.25 h) | 50.2° 00:05 | 7.18 | 0% | 150.6° |
| 2026-04-18 Sat | 93 | 88 | 82 | 21:50–03:55 (good, 6.08 h) | 50.2° 00:05 | 7.12 | 3% | 136.1° |
| 2026-04-19 Sun | 93 | 72 | 67 | 01:00–03:50 (good, 2.83 h) | 50.2° 00:00 | 7.06 | 9% | 121.4° |
| 2026-04-20 Mon | 93 | 52 | 48 | 01:00–03:50 (good, 2.83 h) | 50.2° 23:55 | 7.0 | 16% | 106.7° |
| 2026-04-21 Tue | 90 | 0 | 0 | — | 50.2° 23:50 | 6.95 | 26% | 92.3° |
| 2026-04-22 Wed | 85 | 0 | 0 | — | 50.2° 23:50 | 6.89 | 37% | 78.1° |
| 2026-04-23 Thu | 80 | 96 | 77 | 21:55–03:35 (good, 5.67 h) | 50.2° 23:45 | 6.83 | 48% | 64.2° |
| 2026-04-24 Fri | 65 | 68 | 44 | 02:00–03:00 (good, 1.0 h) | 50.2° 23:40 | 6.77 | 59% | 50.7° |
| 2026-04-25 Sat | 45 | 79 | 35 | 00:00–03:55 (marginal, 3.92 h) | 50.2° 23:35 | 6.71 | 69% | 37.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-03-27&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.