← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-09-01 Tue | 19 | 85 | 16 | 01:15–04:00 (marginal, 2.75 h) | 72.5° 06:25 | 7.61 | 76% | 21.5° |
| 2026-09-02 Wed | 28 | 1 | 0 | — | 72.5° 06:20 | 7.67 | 66% | 7.7° |
| 2026-09-03 Thu | 41 | 87 | 36 | 00:45–05:15 (marginal, 4.5 h) | 72.5° 06:15 | 7.72 | 55% | 6.5° |
| 2026-09-04 Fri | 56 | 100 | 56 | 01:30–05:15 (good, 3.75 h) | 72.5° 06:10 | 7.78 | 43% | 20.6° |
| 2026-09-05 Sat | 75 | 100 | 75 | 01:15–05:15 (good, 4.0 h) | 72.5° 06:10 | 7.83 | 32% | 34.8° |
| 2026-09-06 Sun | 90 | 100 | 90 | 01:00–05:20 (good, 4.33 h) | 72.5° 06:05 | 7.89 | 22% | 49.1° |
| 2026-09-07 Mon | 96 | 100 | 96 | 00:55–05:20 (good, 4.42 h) | 72.5° 06:00 | 7.94 | 13% | 63.4° |
| 2026-09-08 Tue | 100 | 100 | 100 | 00:50–05:20 (good, 4.5 h) | 72.5° 05:55 | 8.0 | 6% | 77.7° |
| 2026-09-09 Wed | 100 | 80 | 80 | 00:50–05:00 (good, 4.17 h) | 72.5° 05:50 | 8.05 | 2% | 91.8° |
| 2026-09-10 Thu | 100 | 100 | 100 | 00:45–05:25 (good, 4.67 h) | 72.5° 05:50 | 8.11 | 0% | 105.8° |
| 2026-09-11 Fri | 100 | 100 | 100 | 00:40–05:25 (good, 4.75 h) | 72.5° 05:45 | 8.16 | 1% | 119.5° |
| 2026-09-12 Sat | 100 | 0 | 0 | — | 72.5° 05:40 | 8.21 | 4% | 132.8° |
| 2026-09-13 Sun | 100 | 91 | 91 | 00:55–05:30 (good, 4.58 h) | 72.5° 05:35 | 8.27 | 9% | 145.8° |
| 2026-09-14 Mon | 100 | 37 | 37 | 00:35–02:00 (good, 1.42 h) | 72.5° 05:35 | 8.32 | 15% | 158.5° |
| 2026-09-15 Tue | 100 | 85 | 85 | 01:35–05:30 (good, 3.92 h) | 72.5° 05:30 | 8.37 | 23% | 170.8° |
| 2026-09-16 Wed | 100 | 99 | 99 | 00:20–05:30 (good, 5.17 h) | 72.5° 05:25 | 8.42 | 32% | 176.8° |
| 2026-09-17 Thu | 100 | 100 | 100 | 00:15–05:30 (good, 5.25 h) | 72.5° 05:20 | 8.48 | 41% | 165.0° |
| 2026-09-18 Fri | 100 | 91 | 91 | 00:15–05:35 (good, 5.33 h) | 72.5° 05:15 | 8.53 | 51% | 153.1° |
| 2026-09-19 Sat | 100 | 76 | 76 | 00:10–02:00 (good, 1.83 h) | 72.5° 05:15 | 8.58 | 60% | 141.3° |
| 2026-09-20 Sun | 100 | 99 | 99 | 00:10–05:35 (good, 5.42 h) | 72.5° 05:10 | 8.63 | 69% | 129.4° |
| 2026-09-21 Mon | 100 | 0 | 0 | — | 72.5° 05:05 | 8.68 | 78% | 117.3° |
| 2026-09-22 Tue | 100 | 42 | 42 | 04:00–05:40 (good, 1.67 h) | 72.5° 05:00 | 8.73 | 85% | 105.1° |
| 2026-09-23 Wed | 100 | 96 | 96 | 01:05–05:40 (good, 4.58 h) | 72.5° 04:55 | 8.78 | 92% | 92.5° |
| 2026-09-24 Thu | 100 | 71 | 71 | 02:05–04:00 (good, 1.92 h) | 72.5° 04:55 | 8.84 | 96% | 79.6° |
| 2026-09-25 Fri | 61 | 0 | 0 | — | 72.5° 04:50 | 8.89 | 99% | 66.5° |
| 2026-09-26 Sat | 41 | 0 | 0 | — | 72.5° 04:45 | 8.94 | 100% | 53.0° |
| 2026-09-27 Sun | 25 | 69 | 17 | 02:25–03:00 (marginal, 0.58 h) | 72.5° 04:40 | 8.98 | 98% | 39.2° |
| 2026-09-28 Mon | 17 | 12 | 2 | — | 72.5° 04:40 | 9.03 | 94% | 25.3° |
| 2026-09-29 Tue | 20 | 0 | 0 | — | 72.5° 04:35 | 9.08 | 87% | 11.2° |
| 2026-09-30 Wed | 31 | 38 | 12 | 00:00–01:00 (marginal, 1.0 h) | 72.5° 04:30 | 9.13 | 78% | 3.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-09-01&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.