← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-08-31 Mon | 30 | 99 | 30 | 22:40–05:10 (marginal, 6.5 h) | 79.1° 04:15 | 7.56 | 85% | 17.3° |
| 2026-09-01 Tue | 41 | 88 | 36 | 22:35–04:00 (marginal, 5.42 h) | 79.1° 04:10 | 7.61 | 76% | 15.3° |
| 2026-09-02 Wed | 57 | 8 | 4 | — | 79.1° 04:10 | 7.67 | 66% | 23.2° |
| 2026-09-03 Thu | 75 | 87 | 65 | 00:00–03:00 (good, 3.0 h) | 79.1° 04:05 | 7.72 | 55% | 35.1° |
| 2026-09-04 Fri | 86 | 99 | 85 | 22:45–05:15 (good, 6.5 h) | 79.1° 04:00 | 7.78 | 43% | 48.1° |
| 2026-09-05 Sat | 95 | 100 | 95 | 22:30–05:15 (good, 6.75 h) | 79.1° 03:55 | 7.83 | 32% | 61.6° |
| 2026-09-06 Sun | 100 | 100 | 100 | 22:25–05:20 (good, 6.92 h) | 79.1° 03:50 | 7.89 | 22% | 75.4° |
| 2026-09-07 Mon | 100 | 100 | 100 | 22:20–05:20 (good, 7.0 h) | 79.1° 03:50 | 7.94 | 13% | 89.2° |
| 2026-09-08 Tue | 100 | 100 | 100 | 22:15–05:20 (good, 7.08 h) | 79.1° 03:45 | 8.0 | 6% | 103.0° |
| 2026-09-09 Wed | 100 | 85 | 85 | 22:20–05:00 (good, 6.67 h) | 79.1° 03:40 | 8.05 | 2% | 116.7° |
| 2026-09-10 Thu | 100 | 100 | 100 | 22:10–05:25 (good, 7.25 h) | 79.1° 03:35 | 8.11 | 0% | 129.9° |
| 2026-09-11 Fri | 100 | 100 | 100 | 22:05–05:25 (good, 7.33 h) | 79.1° 03:30 | 8.16 | 1% | 142.7° |
| 2026-09-12 Sat | 100 | 0 | 0 | — | 79.1° 03:30 | 8.21 | 4% | 154.3° |
| 2026-09-13 Sun | 100 | 88 | 88 | 22:20–05:30 (good, 7.17 h) | 79.1° 03:25 | 8.27 | 9% | 163.2° |
| 2026-09-14 Mon | 100 | 36 | 36 | 00:00–03:00 (good, 3.0 h) | 79.1° 03:20 | 8.32 | 15% | 164.7° |
| 2026-09-15 Tue | 100 | 79 | 79 | 00:45–05:30 (good, 4.75 h) | 79.1° 03:15 | 8.37 | 23% | 157.9° |
| 2026-09-16 Wed | 100 | 98 | 98 | 21:55–05:30 (good, 7.58 h) | 79.1° 03:15 | 8.42 | 32% | 147.9° |
| 2026-09-17 Thu | 100 | 100 | 100 | 21:45–05:30 (good, 7.75 h) | 79.1° 03:10 | 8.48 | 41% | 137.1° |
| 2026-09-18 Fri | 100 | 87 | 87 | 22:40–05:35 (good, 6.92 h) | 79.1° 03:05 | 8.53 | 51% | 125.9° |
| 2026-09-19 Sat | 100 | 82 | 82 | 21:50–03:00 (good, 5.17 h) | 79.1° 03:00 | 8.58 | 60% | 114.6° |
| 2026-09-20 Sun | 100 | 99 | 99 | 21:50–05:35 (good, 7.75 h) | 79.1° 02:55 | 8.63 | 69% | 103.1° |
| 2026-09-21 Mon | 100 | 0 | 0 | — | 79.1° 02:55 | 8.68 | 78% | 91.5° |
| 2026-09-22 Tue | 100 | 34 | 34 | 04:00–05:40 (good, 1.67 h) | 79.1° 02:50 | 8.73 | 85% | 79.6° |
| 2026-09-23 Wed | 100 | 93 | 93 | 01:35–05:40 (good, 4.08 h) | 79.1° 02:45 | 8.78 | 92% | 67.5° |
| 2026-09-24 Thu | 96 | 72 | 69 | 03:55–04:00 (good, 0.08 h) | 79.1° 02:40 | 8.84 | 96% | 55.2° |
| 2026-09-25 Fri | 54 | 2 | 1 | — | 79.1° 02:35 | 8.89 | 99% | 42.8° |
| 2026-09-26 Sat | 32 | 0 | 0 | — | 79.1° 02:35 | 8.94 | 100% | 30.6° |
| 2026-09-27 Sun | 26 | 70 | 18 | — | 79.1° 02:30 | 8.98 | 98% | 19.8° |
| 2026-09-28 Mon | 32 | 31 | 10 | 22:00–23:00 (marginal, 1.0 h) | 79.1° 02:25 | 9.03 | 94% | 14.7° |
| 2026-09-29 Tue | 43 | 0 | 0 | — | 79.1° 02:20 | 9.08 | 87% | 20.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-08-31&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.