← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-06-21 Sun | 100 | 99 | 99 | 23:15–03:40 (good, 4.42 h) | 87.1° 02:00 | 4.42 | 50% | 99.0° |
| 2026-06-22 Mon | 100 | 89 | 89 | 23:15–03:40 (good, 4.42 h) | 87.1° 01:55 | 4.42 | 60% | 93.9° |
| 2026-06-23 Tue | 100 | 58 | 58 | 01:00–03:40 (good, 2.67 h) | 87.1° 01:50 | 4.43 | 70% | 88.7° |
| 2026-06-24 Wed | 100 | 86 | 86 | 23:15–03:40 (good, 4.42 h) | 87.1° 01:45 | 4.43 | 78% | 83.7° |
| 2026-06-25 Thu | 100 | 89 | 89 | 23:15–03:40 (good, 4.42 h) | 87.1° 01:45 | 4.44 | 86% | 79.0° |
| 2026-06-26 Fri | 100 | 95 | 95 | 23:15–03:40 (good, 4.42 h) | 87.1° 01:40 | 4.45 | 92% | 74.7° |
| 2026-06-27 Sat | 74 | 67 | 49 | 23:15–02:00 (good, 2.75 h) | 87.1° 01:35 | 4.47 | 96% | 71.0° |
| 2026-06-28 Sun | 66 | 100 | 66 | 23:15–03:40 (good, 4.42 h) | 87.1° 01:30 | 4.48 | 99% | 68.1° |
| 2026-06-29 Mon | 60 | 89 | 54 | 02:00–03:00 (good, 1.0 h) | 87.1° 01:25 | 4.5 | 100% | 66.1° |
| 2026-06-30 Tue | 62 | 96 | 60 | 23:10–02:00 (good, 2.83 h) | 87.1° 01:25 | 4.52 | 99% | 65.2° |
| 2026-07-01 Wed | 66 | 27 | 18 | 23:10–00:00 (marginal, 0.83 h) | 87.1° 01:20 | 4.54 | 96% | 65.4° |
| 2026-07-02 Thu | 72 | 74 | 53 | 23:10–03:45 (marginal, 4.58 h) | 87.1° 01:15 | 4.56 | 92% | 66.8° |
| 2026-07-03 Fri | 100 | 31 | 31 | 02:00–03:45 (marginal, 1.75 h) | 87.1° 01:10 | 4.58 | 86% | 69.3° |
| 2026-07-04 Sat | 100 | 72 | 72 | 01:00–02:00 (good, 1.0 h) | 87.1° 01:05 | 4.61 | 78% | 72.8° |
| 2026-07-05 Sun | 100 | 89 | 89 | 23:10–03:45 (good, 4.58 h) | 87.1° 01:05 | 4.64 | 70% | 77.1° |
| 2026-07-06 Mon | 100 | 97 | 97 | 23:10–03:50 (good, 4.67 h) | 87.1° 01:00 | 4.67 | 59% | 82.2° |
| 2026-07-07 Tue | 100 | 95 | 95 | 23:10–03:50 (good, 4.67 h) | 87.1° 00:55 | 4.7 | 49% | 87.7° |
| 2026-07-08 Wed | 100 | 0 | 0 | — | 87.1° 00:50 | 4.73 | 38% | 93.4° |
| 2026-07-09 Thu | 100 | 91 | 91 | 23:05–03:50 (good, 4.75 h) | 87.1° 00:50 | 4.76 | 27% | 99.2° |
| 2026-07-10 Fri | 100 | 96 | 96 | 23:05–03:55 (good, 4.83 h) | 87.1° 00:45 | 4.8 | 17% | 104.6° |
| 2026-07-11 Sat | 100 | 100 | 100 | 23:05–03:55 (good, 4.83 h) | 87.1° 00:40 | 4.84 | 9% | 109.2° |
| 2026-07-12 Sun | 100 | 89 | 89 | 23:05–03:55 (good, 4.83 h) | 87.1° 00:35 | 4.87 | 3% | 112.7° |
| 2026-07-13 Mon | 100 | 89 | 89 | 23:00–03:55 (good, 4.92 h) | 87.1° 00:30 | 4.91 | 0% | 114.6° |
| 2026-07-14 Tue | 100 | 98 | 98 | 23:00–04:00 (good, 5.0 h) | 87.1° 00:30 | 4.96 | 0% | 114.7° |
| 2026-07-15 Wed | 100 | 57 | 57 | 02:00–04:00 (good, 2.0 h) | 87.1° 00:25 | 5.0 | 3% | 113.0° |
| 2026-07-16 Thu | 100 | 22 | 22 | 23:00–00:00 (good, 1.0 h) | 87.1° 00:20 | 5.04 | 9% | 109.9° |
| 2026-07-17 Fri | 100 | 98 | 98 | 22:55–04:00 (good, 5.08 h) | 87.1° 00:15 | 5.08 | 16% | 105.7° |
| 2026-07-18 Sat | 100 | 95 | 95 | 22:55–04:05 (good, 5.17 h) | 87.1° 00:10 | 5.13 | 25% | 100.9° |
| 2026-07-19 Sun | 100 | 98 | 98 | 22:55–04:05 (good, 5.17 h) | 87.1° 00:10 | 5.18 | 35% | 95.7° |
| 2026-07-20 Mon | 100 | 53 | 53 | 02:00–04:05 (good, 2.08 h) | 87.1° 00:05 | 5.22 | 45% | 90.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-06-21&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.