← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-09-21 Sun | 100 | 100 | 100 | 20:55–05:40 (good, 8.75 h) | 89.7° 02:00 | 8.7 | 0% | 138.7° |
| 2025-09-22 Mon | 100 | 100 | 100 | 20:55–05:40 (good, 8.75 h) | 89.5° 01:55 | 8.75 | 1% | 145.7° |
| 2025-09-23 Tue | 100 | 100 | 100 | 20:50–05:40 (good, 8.83 h) | 89.5° 01:55 | 8.8 | 4% | 149.6° |
| 2025-09-24 Wed | 100 | 89 | 89 | 20:50–04:00 (good, 7.17 h) | 89.7° 01:50 | 8.85 | 9% | 149.5° |
| 2025-09-25 Thu | 100 | 0 | 0 | — | 89.7° 01:45 | 8.9 | 15% | 145.4° |
| 2025-09-26 Fri | 100 | 19 | 19 | 00:00–01:00 (good, 1.0 h) | 89.6° 01:40 | 8.95 | 22% | 138.6° |
| 2025-09-27 Sat | 100 | 12 | 12 | 20:45–21:00 (good, 0.25 h) | 89.5° 01:35 | 9.0 | 31% | 130.2° |
| 2025-09-28 Sun | 100 | 0 | 0 | — | 89.6° 01:35 | 9.05 | 40% | 120.8° |
| 2025-09-29 Mon | 100 | 4 | 4 | — | 89.7° 01:30 | 9.09 | 49% | 110.8° |
| 2025-09-30 Tue | 100 | 60 | 60 | 00:00–05:50 (good, 5.83 h) | 89.7° 01:25 | 9.14 | 59% | 100.2° |
| 2025-10-01 Wed | 100 | 0 | 0 | — | 89.6° 01:20 | 9.19 | 69% | 89.3° |
| 2025-10-02 Thu | 100 | 0 | 0 | — | 89.5° 01:20 | 9.24 | 78% | 78.0° |
| 2025-10-03 Fri | 100 | 0 | 0 | — | 89.6° 01:15 | 9.29 | 86% | 66.6° |
| 2025-10-04 Sat | 92 | 96 | 88 | 02:40–05:50 (good, 3.17 h) | 89.7° 01:10 | 9.33 | 93% | 55.1° |
| 2025-10-05 Sun | 54 | 39 | 21 | 20:30–23:00 (marginal, 2.5 h) | 89.7° 01:05 | 9.38 | 98% | 44.3° |
| 2025-10-06 Mon | 40 | 0 | 0 | — | 89.5° 01:00 | 9.43 | 100% | 35.3° |
| 2025-10-07 Tue | 35 | 0 | 0 | — | 89.5° 01:00 | 9.47 | 99% | 30.3° |
| 2025-10-08 Wed | 43 | 0 | 0 | — | 89.7° 00:55 | 9.52 | 95% | 31.6° |
| 2025-10-09 Thu | 57 | 94 | 54 | 20:25–04:00 (marginal, 7.58 h) | 89.7° 00:50 | 9.57 | 89% | 38.5° |
| 2025-10-10 Fri | 90 | 65 | 59 | 22:00–22:55 (good, 0.92 h) | 89.6° 00:45 | 9.61 | 80% | 48.5° |
| 2025-10-11 Sat | 97 | 31 | 30 | 20:20–22:00 (good, 1.67 h) | 89.5° 00:40 | 9.66 | 70% | 59.9° |
| 2025-10-12 Sun | 100 | 41 | 41 | 01:00–03:00 (good, 2.0 h) | 89.6° 00:40 | 9.7 | 59% | 71.7° |
| 2025-10-13 Mon | 100 | 6 | 6 | — | 89.7° 00:35 | 9.74 | 48% | 83.5° |
| 2025-10-14 Tue | 100 | 0 | 0 | — | 89.7° 00:30 | 9.79 | 38% | 95.1° |
| 2025-10-15 Wed | 100 | 14 | 14 | 23:00–00:00 (good, 1.0 h) | 89.6° 00:25 | 9.83 | 28% | 106.4° |
| 2025-10-16 Thu | 100 | 0 | 0 | — | 89.5° 00:25 | 9.87 | 19% | 117.2° |
| 2025-10-17 Fri | 100 | 0 | 0 | — | 89.6° 00:20 | 9.92 | 12% | 127.3° |
| 2025-10-18 Sat | 100 | 1 | 1 | — | 89.7° 00:15 | 9.96 | 6% | 136.4° |
| 2025-10-19 Sun | 100 | 0 | 0 | — | 89.7° 00:10 | 10.0 | 2% | 144.0° |
| 2025-10-20 Mon | 100 | 18 | 18 | 20:05–21:00 (good, 0.92 h) | 89.5° 00:05 | 10.04 | 0% | 148.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-09-21&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.