← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-05-20 Tue | 100 | 42 | 42 | 22:40–00:00 (good, 1.33 h) | 87.1° 04:05 | 5.31 | 45% | 73.9° |
| 2025-05-21 Wed | 100 | 68 | 68 | 23:00–02:00 (good, 3.0 h) | 87.1° 04:00 | 5.26 | 34% | 78.5° |
| 2025-05-22 Thu | 100 | 96 | 96 | 22:45–03:55 (good, 5.17 h) | 87.1° 03:55 | 5.21 | 24% | 83.8° |
| 2025-05-23 Fri | 100 | 6 | 6 | — | 87.1° 03:50 | 5.16 | 15% | 89.5° |
| 2025-05-24 Sat | 100 | 0 | 0 | — | 87.1° 03:45 | 5.12 | 7% | 95.4° |
| 2025-05-25 Sun | 100 | 0 | 0 | — | 87.1° 03:45 | 5.07 | 2% | 101.1° |
| 2025-05-26 Mon | 100 | 77 | 77 | 22:50–03:50 (good, 5.0 h) | 87.1° 03:40 | 5.03 | 0% | 106.1° |
| 2025-05-27 Tue | 100 | 99 | 99 | 22:50–03:50 (good, 5.0 h) | 87.1° 03:35 | 4.98 | 1% | 110.1° |
| 2025-05-28 Wed | 100 | 91 | 91 | 22:55–03:50 (good, 4.92 h) | 87.1° 03:30 | 4.94 | 5% | 112.6° |
| 2025-05-29 Thu | 100 | 20 | 20 | 22:55–01:00 (marginal, 2.08 h) | 87.1° 03:30 | 4.9 | 11% | 113.6° |
| 2025-05-30 Fri | 100 | 17 | 17 | 02:00–03:45 (marginal, 1.75 h) | 87.1° 03:25 | 4.86 | 19% | 113.1° |
| 2025-05-31 Sat | 100 | 86 | 86 | 22:55–03:45 (good, 4.83 h) | 87.1° 03:20 | 4.82 | 28% | 111.3° |
| 2025-06-01 Sun | 100 | 30 | 30 | 23:00–00:00 (good, 1.0 h) | 87.1° 03:15 | 4.79 | 38% | 108.4° |
| 2025-06-02 Mon | 100 | 98 | 98 | 23:00–03:45 (good, 4.75 h) | 87.1° 03:10 | 4.75 | 48% | 104.8° |
| 2025-06-03 Tue | 100 | 100 | 100 | 23:00–03:45 (good, 4.75 h) | 87.1° 03:10 | 4.72 | 58% | 100.6° |
| 2025-06-04 Wed | 100 | 100 | 100 | 23:00–03:40 (good, 4.67 h) | 87.1° 03:05 | 4.69 | 67% | 96.0° |
| 2025-06-05 Thu | 100 | 16 | 16 | 03:00–03:40 (good, 0.67 h) | 87.1° 03:00 | 4.65 | 76% | 91.3° |
| 2025-06-06 Fri | 100 | 100 | 100 | 23:05–03:40 (good, 4.58 h) | 87.1° 02:55 | 4.63 | 83% | 86.5° |
| 2025-06-07 Sat | 100 | 100 | 100 | 23:05–03:40 (good, 4.58 h) | 87.1° 02:50 | 4.6 | 90% | 81.9° |
| 2025-06-08 Sun | 77 | 99 | 76 | 23:05–03:40 (good, 4.58 h) | 87.1° 02:50 | 4.57 | 95% | 77.6° |
| 2025-06-09 Mon | 70 | 93 | 65 | 00:00–03:40 (good, 3.67 h) | 87.1° 02:45 | 4.55 | 98% | 73.7° |
| 2025-06-10 Tue | 65 | 51 | 33 | 00:00–02:00 (good, 2.0 h) | 87.1° 02:40 | 4.53 | 100% | 70.4° |
| 2025-06-11 Wed | 62 | 94 | 58 | 23:10–01:00 (good, 1.83 h) | 87.1° 02:35 | 4.51 | 100% | 68.0° |
| 2025-06-12 Thu | 65 | 99 | 65 | 23:10–03:40 (good, 4.5 h) | 87.1° 02:35 | 4.49 | 97% | 66.6° |
| 2025-06-13 Fri | 95 | 69 | 65 | 00:00–01:00 (good, 1.0 h) | 87.1° 02:30 | 4.47 | 93% | 66.3° |
| 2025-06-14 Sat | 100 | 37 | 37 | 02:00–02:45 (good, 0.75 h) | 87.1° 02:25 | 4.46 | 87% | 67.3° |
| 2025-06-15 Sun | 100 | 81 | 81 | 23:10–01:00 (good, 1.83 h) | 87.1° 02:20 | 4.45 | 79% | 69.5° |
| 2025-06-16 Mon | 100 | 97 | 97 | 23:10–03:40 (good, 4.5 h) | 87.1° 02:15 | 4.44 | 70% | 72.8° |
| 2025-06-17 Tue | 100 | 98 | 98 | 23:10–03:40 (good, 4.5 h) | 87.1° 02:15 | 4.43 | 60% | 77.0° |
| 2025-06-18 Wed | 100 | 97 | 97 | 23:10–03:40 (good, 4.5 h) | 87.1° 02:10 | 4.43 | 49% | 82.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-05-20&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.