← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-08-17 Sun | 94 | 96 | 90 | 22:25–04:50 (good, 6.42 h) | 89.6° 04:20 | 6.77 | 31% | 54.2° |
| 2025-08-18 Mon | 100 | 41 | 41 | 01:00–02:00 (good, 1.0 h) | 89.7° 04:15 | 6.83 | 21% | 65.6° |
| 2025-08-19 Tue | 100 | 0 | 0 | — | 89.7° 04:10 | 6.89 | 13% | 77.4° |
| 2025-08-20 Wed | 100 | 100 | 100 | 22:05–04:55 (good, 6.83 h) | 89.6° 04:05 | 6.94 | 6% | 89.2° |
| 2025-08-21 Thu | 100 | 100 | 100 | 22:00–04:55 (good, 6.92 h) | 89.5° 04:05 | 7.0 | 2% | 100.9° |
| 2025-08-22 Fri | 100 | 97 | 97 | 22:25–05:00 (good, 6.58 h) | 89.6° 04:00 | 7.06 | 0% | 112.2° |
| 2025-08-23 Sat | 100 | 86 | 86 | 00:00–05:00 (good, 5.0 h) | 89.7° 03:55 | 7.12 | 0% | 122.9° |
| 2025-08-24 Sun | 100 | 94 | 94 | 22:00–05:00 (good, 7.0 h) | 89.7° 03:50 | 7.17 | 3% | 132.7° |
| 2025-08-25 Mon | 100 | 83 | 83 | 23:00–05:05 (good, 6.08 h) | 89.5° 03:45 | 7.23 | 7% | 141.2° |
| 2025-08-26 Tue | 100 | 57 | 57 | 01:00–05:05 (good, 4.08 h) | 89.6° 03:45 | 7.29 | 13% | 147.3° |
| 2025-08-27 Wed | 100 | 100 | 100 | 21:45–05:05 (good, 7.33 h) | 89.7° 03:40 | 7.34 | 20% | 150.0° |
| 2025-08-28 Thu | 100 | 100 | 100 | 21:45–05:05 (good, 7.33 h) | 89.7° 03:35 | 7.4 | 28% | 148.6° |
| 2025-08-29 Fri | 100 | 100 | 100 | 21:40–05:10 (good, 7.5 h) | 89.6° 03:30 | 7.46 | 37% | 143.5° |
| 2025-08-30 Sat | 100 | 61 | 61 | 23:00–04:00 (good, 5.0 h) | 89.5° 03:25 | 7.51 | 47% | 136.0° |
| 2025-08-31 Sun | 100 | 100 | 100 | 21:35–05:10 (good, 7.58 h) | 89.6° 03:25 | 7.57 | 56% | 127.2° |
| 2025-09-01 Mon | 100 | 97 | 97 | 22:00–05:10 (good, 7.17 h) | 89.7° 03:20 | 7.62 | 66% | 117.4° |
| 2025-09-02 Tue | 100 | 100 | 100 | 21:35–05:15 (good, 7.67 h) | 89.7° 03:15 | 7.68 | 75% | 107.0° |
| 2025-09-03 Wed | 100 | 38 | 38 | 02:00–03:00 (good, 1.0 h) | 89.6° 03:10 | 7.74 | 83% | 96.1° |
| 2025-09-04 Thu | 100 | 40 | 40 | 04:00–05:15 (good, 1.25 h) | 89.5° 03:10 | 7.79 | 90% | 84.8° |
| 2025-09-05 Fri | 100 | 14 | 14 | 04:55–05:00 (good, 0.08 h) | 89.6° 03:05 | 7.85 | 96% | 73.2° |
| 2025-09-06 Sat | 67 | 88 | 59 | 05:00–05:20 (good, 0.33 h) | 89.7° 03:00 | 7.9 | 99% | 61.6° |
| 2025-09-07 Sun | 55 | 0 | 0 | — | 89.7° 02:55 | 7.96 | 100% | 50.3° |
| 2025-09-08 Mon | 40 | 55 | 22 | 01:00–05:20 (marginal, 4.33 h) | 89.5° 02:50 | 8.01 | 98% | 40.1° |
| 2025-09-09 Tue | 39 | 98 | 38 | 21:20–05:25 (marginal, 8.08 h) | 89.5° 02:50 | 8.06 | 94% | 32.6° |
| 2025-09-10 Wed | 47 | 60 | 28 | 22:00–00:15 (marginal, 2.25 h) | 89.7° 02:45 | 8.12 | 87% | 29.9° |
| 2025-09-11 Thu | 82 | 29 | 24 | 02:00–05:00 (marginal, 3.0 h) | 89.7° 02:40 | 8.17 | 78% | 33.4° |
| 2025-09-12 Fri | 86 | 31 | 26 | 21:15–22:00 (good, 0.75 h) | 89.6° 02:35 | 8.23 | 67% | 41.4° |
| 2025-09-13 Sat | 92 | 95 | 87 | 22:00–05:30 (good, 7.5 h) | 89.5° 02:30 | 8.28 | 56% | 51.7° |
| 2025-09-14 Sun | 99 | 33 | 33 | 02:00–04:00 (good, 2.0 h) | 89.6° 02:30 | 8.33 | 44% | 62.9° |
| 2025-09-15 Mon | 100 | 100 | 100 | 21:05–05:30 (good, 8.42 h) | 89.7° 02:25 | 8.38 | 34% | 74.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-08-17&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.