← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-08-23 Sun | 100 | 85 | 85 | 23:00–05:00 (good, 6.0 h) | 89.7° 03:55 | 7.1 | 83% | 104.9° |
| 2026-08-24 Mon | 100 | 57 | 57 | 02:00–05:00 (good, 3.0 h) | 89.5° 03:50 | 7.16 | 90% | 94.4° |
| 2026-08-25 Tue | 100 | 98 | 98 | 23:10–05:00 (good, 5.83 h) | 89.5° 03:50 | 7.22 | 95% | 83.7° |
| 2026-08-26 Wed | 73 | 95 | 69 | 00:45–05:05 (good, 4.33 h) | 89.7° 03:45 | 7.27 | 98% | 72.9° |
| 2026-08-27 Thu | 63 | 97 | 61 | 04:35–05:05 (good, 0.5 h) | 89.7° 03:40 | 7.33 | 100% | 62.1° |
| 2026-08-28 Fri | 50 | 92 | 46 | 21:45–05:05 (marginal, 7.33 h) | 89.6° 03:35 | 7.39 | 99% | 51.6° |
| 2026-08-29 Sat | 38 | 16 | 6 | 21:40–23:00 (marginal, 1.33 h) | 89.5° 03:30 | 7.44 | 97% | 41.9° |
| 2026-08-30 Sun | 37 | 98 | 36 | 21:40–05:10 (marginal, 7.5 h) | 89.6° 03:30 | 7.5 | 92% | 33.8° |
| 2026-08-31 Mon | 44 | 99 | 44 | 21:35–05:10 (marginal, 7.58 h) | 89.7° 03:25 | 7.56 | 85% | 29.2° |
| 2026-09-01 Tue | 76 | 88 | 67 | 21:35–21:45 (good, 0.17 h) | 89.7° 03:20 | 7.61 | 76% | 30.0° |
| 2026-09-02 Wed | 84 | 7 | 6 | — | 89.6° 03:15 | 7.67 | 66% | 36.1° |
| 2026-09-03 Thu | 89 | 87 | 78 | 00:00–03:00 (good, 3.0 h) | 89.5° 03:15 | 7.72 | 55% | 45.4° |
| 2026-09-04 Fri | 95 | 97 | 92 | 21:30–05:15 (good, 7.75 h) | 89.6° 03:10 | 7.78 | 43% | 56.4° |
| 2026-09-05 Sat | 100 | 100 | 100 | 21:25–05:15 (good, 7.83 h) | 89.7° 03:05 | 7.83 | 32% | 68.3° |
| 2026-09-06 Sun | 100 | 99 | 99 | 21:25–05:20 (good, 7.92 h) | 89.7° 03:00 | 7.89 | 22% | 80.7° |
| 2026-09-07 Mon | 100 | 100 | 100 | 21:25–05:20 (good, 7.92 h) | 89.5° 02:55 | 7.94 | 13% | 93.2° |
| 2026-09-08 Tue | 100 | 100 | 100 | 21:20–05:20 (good, 8.0 h) | 89.5° 02:55 | 8.0 | 6% | 105.6° |
| 2026-09-09 Wed | 100 | 85 | 85 | 21:20–05:00 (good, 7.67 h) | 89.7° 02:50 | 8.05 | 2% | 117.7° |
| 2026-09-10 Thu | 100 | 100 | 100 | 21:15–05:25 (good, 8.17 h) | 89.7° 02:45 | 8.11 | 0% | 129.1° |
| 2026-09-11 Fri | 100 | 99 | 99 | 21:15–05:25 (good, 8.17 h) | 89.6° 02:40 | 8.16 | 1% | 139.1° |
| 2026-09-12 Sat | 100 | 0 | 0 | — | 89.5° 02:35 | 8.21 | 4% | 146.9° |
| 2026-09-13 Sun | 100 | 88 | 88 | 21:10–05:30 (good, 8.33 h) | 89.6° 02:35 | 8.27 | 9% | 150.9° |
| 2026-09-14 Mon | 100 | 37 | 37 | 00:00–03:00 (good, 3.0 h) | 89.7° 02:30 | 8.32 | 15% | 149.9° |
| 2026-09-15 Tue | 100 | 75 | 75 | 23:15–05:30 (good, 6.25 h) | 89.7° 02:25 | 8.37 | 23% | 144.7° |
| 2026-09-16 Wed | 100 | 97 | 97 | 21:05–05:30 (good, 8.42 h) | 89.6° 02:20 | 8.42 | 32% | 137.0° |
| 2026-09-17 Thu | 100 | 100 | 100 | 21:05–05:30 (good, 8.42 h) | 89.5° 02:20 | 8.48 | 41% | 128.0° |
| 2026-09-18 Fri | 100 | 87 | 87 | 21:15–05:35 (good, 8.33 h) | 89.6° 02:15 | 8.53 | 51% | 118.4° |
| 2026-09-19 Sat | 100 | 83 | 83 | 21:00–03:00 (good, 6.0 h) | 89.7° 02:10 | 8.58 | 60% | 108.3° |
| 2026-09-20 Sun | 100 | 98 | 98 | 21:00–05:35 (good, 8.58 h) | 89.7° 02:05 | 8.63 | 69% | 98.0° |
| 2026-09-21 Mon | 100 | 0 | 0 | — | 89.5° 02:00 | 8.68 | 78% | 87.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-08-23&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.