← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-08-16 Sat | 100 | 99 | 99 | 22:05–04:50 (good, 6.75 h) | 87.3° 00:40 | 6.71 | 42% | 82.7° |
| 2025-08-17 Sun | 100 | 96 | 96 | 22:05–04:50 (good, 6.75 h) | 87.3° 00:35 | 6.77 | 31% | 90.1° |
| 2025-08-18 Mon | 100 | 42 | 42 | 00:00–02:00 (good, 2.0 h) | 87.3° 00:30 | 6.83 | 21% | 97.5° |
| 2025-08-19 Tue | 100 | 0 | 0 | — | 87.2° 00:25 | 6.89 | 13% | 104.4° |
| 2025-08-20 Wed | 100 | 99 | 99 | 22:00–04:55 (good, 6.92 h) | 87.2° 00:25 | 6.94 | 6% | 110.7° |
| 2025-08-21 Thu | 100 | 100 | 100 | 21:55–04:55 (good, 7.0 h) | 87.3° 00:20 | 7.0 | 2% | 115.8° |
| 2025-08-22 Fri | 100 | 96 | 96 | 21:55–05:00 (good, 7.08 h) | 87.3° 00:15 | 7.06 | 0% | 119.6° |
| 2025-08-23 Sat | 100 | 84 | 84 | 21:55–05:00 (good, 7.08 h) | 87.3° 00:10 | 7.12 | 0% | 121.6° |
| 2025-08-24 Sun | 100 | 92 | 92 | 22:00–05:00 (good, 7.0 h) | 87.2° 00:05 | 7.17 | 3% | 122.0° |
| 2025-08-25 Mon | 100 | 80 | 80 | 23:00–05:05 (good, 6.08 h) | 87.2° 00:05 | 7.23 | 7% | 120.6° |
| 2025-08-26 Tue | 100 | 51 | 51 | 01:00–05:05 (good, 4.08 h) | 87.3° 00:00 | 7.29 | 13% | 117.7° |
| 2025-08-27 Wed | 100 | 100 | 100 | 21:45–05:05 (good, 7.33 h) | 87.3° 23:55 | 7.34 | 20% | 113.7° |
| 2025-08-28 Thu | 100 | 100 | 100 | 21:45–05:05 (good, 7.33 h) | 87.2° 23:50 | 7.4 | 28% | 108.8° |
| 2025-08-29 Fri | 100 | 100 | 100 | 21:40–05:10 (good, 7.5 h) | 87.2° 23:50 | 7.46 | 37% | 103.2° |
| 2025-08-30 Sat | 100 | 62 | 62 | 23:00–04:00 (good, 5.0 h) | 87.2° 23:45 | 7.51 | 47% | 97.2° |
| 2025-08-31 Sun | 100 | 99 | 99 | 21:35–05:10 (good, 7.58 h) | 87.3° 23:40 | 7.57 | 56% | 90.9° |
| 2025-09-01 Mon | 100 | 97 | 97 | 21:35–05:10 (good, 7.58 h) | 87.3° 23:35 | 7.62 | 66% | 84.5° |
| 2025-09-02 Tue | 100 | 100 | 100 | 21:35–05:15 (good, 7.67 h) | 87.2° 23:30 | 7.68 | 75% | 78.1° |
| 2025-09-03 Wed | 98 | 36 | 36 | 02:30–03:00 (good, 0.5 h) | 87.2° 23:30 | 7.74 | 83% | 72.1° |
| 2025-09-04 Thu | 89 | 38 | 34 | 05:00–05:15 (good, 0.25 h) | 87.3° 23:25 | 7.79 | 90% | 66.6° |
| 2025-09-05 Fri | 81 | 12 | 9 | 04:00–05:20 (marginal, 1.33 h) | 87.3° 23:20 | 7.85 | 96% | 62.1° |
| 2025-09-06 Sat | 61 | 89 | 54 | 21:00–05:20 (marginal, 8.33 h) | 87.3° 23:15 | 7.9 | 99% | 59.0° |
| 2025-09-07 Sun | 61 | 0 | 0 | — | 87.2° 23:10 | 7.96 | 100% | 58.0° |
| 2025-09-08 Mon | 64 | 50 | 32 | 01:00–05:20 (marginal, 4.33 h) | 87.2° 23:10 | 8.01 | 98% | 59.1° |
| 2025-09-09 Tue | 69 | 98 | 68 | 21:20–23:20 (good, 2.0 h) | 87.3° 23:05 | 8.06 | 94% | 62.4° |
| 2025-09-10 Wed | 76 | 62 | 47 | 22:00–00:00 (good, 2.0 h) | 87.3° 23:00 | 8.12 | 87% | 67.4° |
| 2025-09-11 Thu | 100 | 28 | 28 | 02:00–05:00 (marginal, 3.0 h) | 87.3° 22:55 | 8.17 | 78% | 73.8° |
| 2025-09-12 Fri | 100 | 27 | 27 | 21:15–22:00 (good, 0.75 h) | 87.2° 22:50 | 8.23 | 67% | 80.9° |
| 2025-09-13 Sat | 100 | 94 | 94 | 21:10–04:45 (good, 7.58 h) | 87.2° 22:50 | 8.28 | 56% | 88.3° |
| 2025-09-14 Sun | 100 | 35 | 35 | 02:00–04:00 (good, 2.0 h) | 87.3° 22:45 | 8.33 | 44% | 95.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-08-16&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.