← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-08-30 Sun | 78 | 97 | 76 | 21:40–01:35 (good, 3.92 h) | 87.1° 21:25 | 7.5 | 92% | 84.9° |
| 2026-08-31 Mon | 83 | 99 | 82 | 21:35–02:20 (good, 4.75 h) | 87.1° 21:20 | 7.56 | 85% | 90.5° |
| 2026-09-01 Tue | 100 | 92 | 92 | 21:35–02:45 (good, 5.17 h) | 87.1° 21:15 | 7.61 | 76% | 96.2° |
| 2026-09-02 Wed | 100 | 9 | 9 | — | 87.1° 21:10 | 7.67 | 66% | 101.7° |
| 2026-09-03 Thu | 100 | 89 | 89 | 21:30–02:50 (good, 5.33 h) | 87.1° 21:05 | 7.72 | 55% | 106.6° |
| 2026-09-04 Fri | 100 | 96 | 96 | 21:30–02:55 (good, 5.42 h) | 87.1° 21:05 | 7.78 | 43% | 110.6° |
| 2026-09-05 Sat | 100 | 100 | 100 | 21:25–02:55 (good, 5.5 h) | 87.1° 21:00 | 7.83 | 32% | 113.4° |
| 2026-09-06 Sun | 100 | 99 | 99 | 21:25–02:55 (good, 5.5 h) | 87.1° 20:55 | 7.89 | 22% | 114.7° |
| 2026-09-07 Mon | 100 | 100 | 100 | 21:25–02:50 (good, 5.42 h) | 87.1° 20:50 | 7.94 | 13% | 114.4° |
| 2026-09-08 Tue | 100 | 100 | 100 | 21:20–02:45 (good, 5.42 h) | 87.1° 20:50 | 8.0 | 6% | 112.5° |
| 2026-09-09 Wed | 100 | 92 | 92 | 21:20–02:30 (good, 5.17 h) | 87.1° 20:45 | 8.05 | 2% | 109.2° |
| 2026-09-10 Thu | 100 | 99 | 99 | 21:15–02:40 (good, 5.42 h) | 87.1° 20:40 | 8.11 | 0% | 104.9° |
| 2026-09-11 Fri | 100 | 98 | 98 | 21:15–02:35 (good, 5.33 h) | 87.1° 20:35 | 8.16 | 1% | 99.9° |
| 2026-09-12 Sat | 100 | 0 | 0 | — | 87.1° 20:30 | 8.21 | 4% | 94.5° |
| 2026-09-13 Sun | 100 | 84 | 84 | 21:10–02:10 (good, 5.0 h) | 87.1° 20:30 | 8.27 | 9% | 89.0° |
| 2026-09-14 Mon | 100 | 51 | 51 | 00:00–02:00 (good, 2.0 h) | 87.1° 20:25 | 8.32 | 15% | 83.8° |
| 2026-09-15 Tue | 100 | 62 | 62 | 22:00–23:30 (good, 1.5 h) | 87.1° 20:20 | 8.37 | 23% | 78.9° |
| 2026-09-16 Wed | 100 | 95 | 95 | 21:05–02:15 (good, 5.17 h) | 87.1° 20:15 | 8.42 | 32% | 74.5° |
| 2026-09-17 Thu | 100 | 100 | 100 | 21:05–02:10 (good, 5.08 h) | 87.1° 20:10 | 8.48 | 41% | 70.8° |
| 2026-09-18 Fri | 96 | 82 | 79 | 21:00–01:50 (good, 4.83 h) | 87.1° 20:10 | 8.53 | 51% | 67.9° |
| 2026-09-19 Sat | 89 | 94 | 84 | 21:00–02:00 (good, 5.0 h) | 87.1° 20:05 | 8.58 | 60% | 66.0° |
| 2026-09-20 Sun | 82 | 96 | 79 | 21:00–02:00 (good, 5.0 h) | 87.1° 20:00 | 8.63 | 69% | 65.1° |
| 2026-09-21 Mon | 66 | 0 | 0 | — | 87.1° 19:55 | 8.68 | 78% | 65.5° |
| 2026-09-22 Tue | 58 | 4 | 2 | — | 87.1° 19:55 | 8.73 | 85% | 66.9° |
| 2026-09-23 Wed | 54 | 85 | 46 | 22:00–22:05 (good, 0.08 h) | 87.1° 19:50 | 8.78 | 92% | 69.6° |
| 2026-09-24 Thu | 52 | 84 | 43 | 20:50–02:00 (marginal, 5.17 h) | 87.1° 19:45 | 8.84 | 96% | 73.3° |
| 2026-09-25 Fri | 54 | 4 | 2 | — | 87.1° 19:40 | 8.89 | 99% | 77.9° |
| 2026-09-26 Sat | 60 | 0 | 0 | — | 87.1° 19:35 | 8.94 | 100% | 83.2° |
| 2026-09-27 Sun | 67 | 77 | 52 | 20:45–01:55 (marginal, 5.17 h) | 87.1° 19:35 | 8.98 | 98% | 88.9° |
| 2026-09-28 Mon | 76 | 52 | 39 | 22:00–22:55 (good, 0.92 h) | 87.1° 19:30 | 9.03 | 94% | 94.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-08-30&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.