← 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 | 00:00–05:40 (good, 5.67 h) | 72.5° 05:05 | 8.7 | 0% | 120.5° |
| 2025-09-22 Mon | 100 | 100 | 100 | 23:55–05:40 (good, 5.75 h) | 72.5° 05:00 | 8.75 | 1% | 132.8° |
| 2025-09-23 Tue | 100 | 100 | 100 | 23:50–05:40 (good, 5.83 h) | 72.5° 04:55 | 8.8 | 4% | 144.9° |
| 2025-09-24 Wed | 100 | 85 | 85 | 23:50–04:00 (good, 4.17 h) | 72.5° 04:50 | 8.85 | 9% | 156.9° |
| 2025-09-25 Thu | 100 | 0 | 0 | — | 72.5° 04:50 | 8.9 | 15% | 168.7° |
| 2025-09-26 Fri | 100 | 26 | 26 | 00:00–03:00 (marginal, 3.0 h) | 72.5° 04:45 | 8.95 | 22% | 179.0° |
| 2025-09-27 Sat | 100 | 0 | 0 | — | 72.5° 04:40 | 9.0 | 31% | 167.6° |
| 2025-09-28 Sun | 100 | 0 | 0 | — | 72.5° 04:35 | 9.05 | 40% | 155.7° |
| 2025-09-29 Mon | 100 | 6 | 6 | 05:00–05:45 (marginal, 0.75 h) | 72.5° 04:35 | 9.09 | 49% | 143.7° |
| 2025-09-30 Tue | 100 | 83 | 83 | 00:00–05:50 (good, 5.83 h) | 72.5° 04:30 | 9.14 | 59% | 131.3° |
| 2025-10-01 Wed | 100 | 0 | 0 | — | 72.5° 04:25 | 9.19 | 69% | 118.7° |
| 2025-10-02 Thu | 100 | 0 | 0 | — | 72.5° 04:20 | 9.24 | 78% | 105.7° |
| 2025-10-03 Fri | 100 | 0 | 0 | — | 72.5° 04:15 | 9.29 | 86% | 92.2° |
| 2025-10-04 Sat | 100 | 99 | 99 | 00:55–05:50 (good, 4.92 h) | 72.5° 04:15 | 9.33 | 93% | 78.2° |
| 2025-10-05 Sun | 71 | 23 | 16 | 00:00–01:00 (marginal, 1.0 h) | 72.5° 04:10 | 9.38 | 98% | 63.8° |
| 2025-10-06 Mon | 46 | 0 | 0 | — | 72.5° 04:05 | 9.43 | 100% | 49.1° |
| 2025-10-07 Tue | 25 | 0 | 0 | — | 72.5° 04:00 | 9.47 | 99% | 34.2° |
| 2025-10-08 Wed | 19 | 0 | 0 | — | 72.5° 03:55 | 9.52 | 95% | 19.1° |
| 2025-10-09 Thu | 23 | 96 | 22 | 23:00–03:20 (marginal, 4.33 h) | 72.5° 03:55 | 9.57 | 89% | 4.2° |
| 2025-10-10 Fri | 35 | 52 | 18 | 22:35–02:00 (marginal, 3.42 h) | 72.5° 03:50 | 9.61 | 80% | 10.7° |
| 2025-10-11 Sat | 53 | 11 | 6 | — | 72.5° 03:45 | 9.66 | 70% | 25.1° |
| 2025-10-12 Sun | 67 | 49 | 33 | 02:00–03:00 (good, 1.0 h) | 72.5° 03:40 | 9.7 | 59% | 39.2° |
| 2025-10-13 Mon | 87 | 8 | 7 | — | 72.5° 03:40 | 9.74 | 48% | 53.0° |
| 2025-10-14 Tue | 96 | 0 | 0 | — | 72.5° 03:35 | 9.79 | 38% | 66.4° |
| 2025-10-15 Wed | 100 | 18 | 18 | 23:00–00:00 (good, 1.0 h) | 72.5° 03:30 | 9.83 | 28% | 79.5° |
| 2025-10-16 Thu | 100 | 0 | 0 | — | 72.5° 03:25 | 9.87 | 19% | 92.3° |
| 2025-10-17 Fri | 100 | 0 | 0 | — | 72.5° 03:20 | 9.92 | 12% | 104.8° |
| 2025-10-18 Sat | 100 | 2 | 2 | 06:00–06:10 (marginal, 0.17 h) | 72.5° 03:20 | 9.96 | 6% | 117.2° |
| 2025-10-19 Sun | 100 | 0 | 0 | — | 72.5° 03:15 | 10.0 | 2% | 129.4° |
| 2025-10-20 Mon | 100 | 4 | 4 | — | 72.5° 03:10 | 10.04 | 0% | 141.5° |
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.