← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-09-19 Fri | 100 | 98 | 98 | 21:35–05:35 (good, 8.0 h) | 79.1° 03:00 | 8.59 | 4% | 119.5° |
| 2025-09-20 Sat | 100 | 76 | 76 | 01:00–05:35 (good, 4.58 h) | 79.1° 02:55 | 8.64 | 1% | 131.5° |
| 2025-09-21 Sun | 100 | 100 | 100 | 21:25–05:40 (good, 8.25 h) | 79.1° 02:50 | 8.7 | 0% | 142.9° |
| 2025-09-22 Mon | 100 | 100 | 100 | 21:20–05:40 (good, 8.33 h) | 79.1° 02:50 | 8.75 | 1% | 153.4° |
| 2025-09-23 Tue | 100 | 100 | 100 | 21:20–05:40 (good, 8.33 h) | 79.1° 02:45 | 8.8 | 4% | 161.7° |
| 2025-09-24 Wed | 100 | 89 | 89 | 21:20–04:00 (good, 6.67 h) | 79.1° 02:40 | 8.85 | 9% | 164.2° |
| 2025-09-25 Thu | 100 | 0 | 0 | — | 79.1° 02:35 | 8.9 | 15% | 159.0° |
| 2025-09-26 Fri | 100 | 20 | 20 | 00:00–01:00 (good, 1.0 h) | 79.1° 02:30 | 8.95 | 22% | 150.0° |
| 2025-09-27 Sat | 100 | 9 | 9 | 22:00–23:00 (marginal, 1.0 h) | 79.1° 02:30 | 9.0 | 31% | 139.6° |
| 2025-09-28 Sun | 100 | 0 | 0 | — | 79.1° 02:25 | 9.05 | 40% | 128.5° |
| 2025-09-29 Mon | 100 | 4 | 4 | 05:00–05:10 (marginal, 0.17 h) | 79.1° 02:20 | 9.09 | 49% | 117.1° |
| 2025-09-30 Tue | 100 | 64 | 64 | 00:00–05:50 (good, 5.83 h) | 79.1° 02:15 | 9.14 | 59% | 105.3° |
| 2025-10-01 Wed | 100 | 0 | 0 | — | 79.1° 02:15 | 9.19 | 69% | 93.2° |
| 2025-10-02 Thu | 100 | 0 | 0 | — | 79.1° 02:10 | 9.24 | 78% | 80.6° |
| 2025-10-03 Fri | 100 | 0 | 0 | — | 79.1° 02:05 | 9.29 | 86% | 67.7° |
| 2025-10-04 Sat | 95 | 97 | 92 | 02:45–05:50 (good, 3.08 h) | 79.1° 02:00 | 9.33 | 93% | 54.4° |
| 2025-10-05 Sun | 55 | 36 | 20 | 20:35–22:00 (marginal, 1.42 h) | 79.1° 01:55 | 9.38 | 98% | 41.0° |
| 2025-10-06 Mon | 34 | 0 | 0 | — | 79.1° 01:55 | 9.43 | 100% | 28.2° |
| 2025-10-07 Tue | 29 | 0 | 0 | — | 79.1° 01:50 | 9.47 | 99% | 17.9° |
| 2025-10-08 Wed | 34 | 0 | 0 | — | 79.1° 01:45 | 9.52 | 95% | 16.9° |
| 2025-10-09 Thu | 46 | 94 | 43 | 20:25–03:20 (marginal, 6.92 h) | 79.1° 01:40 | 9.57 | 89% | 26.2° |
| 2025-10-10 Fri | 81 | 65 | 52 | 20:20–20:45 (good, 0.42 h) | 79.1° 01:35 | 9.61 | 80% | 38.9° |
| 2025-10-11 Sat | 88 | 29 | 26 | 20:20–21:40 (good, 1.33 h) | 79.1° 01:35 | 9.66 | 70% | 52.2° |
| 2025-10-12 Sun | 96 | 41 | 39 | 01:00–03:00 (good, 2.0 h) | 79.1° 01:30 | 9.7 | 59% | 65.6° |
| 2025-10-13 Mon | 100 | 6 | 6 | — | 79.1° 01:25 | 9.74 | 48% | 78.8° |
| 2025-10-14 Tue | 100 | 0 | 0 | — | 79.1° 01:20 | 9.79 | 38% | 91.7° |
| 2025-10-15 Wed | 100 | 15 | 15 | 23:00–00:00 (good, 1.0 h) | 79.1° 01:20 | 9.83 | 28% | 104.3° |
| 2025-10-16 Thu | 100 | 0 | 0 | — | 79.1° 01:15 | 9.87 | 19% | 116.6° |
| 2025-10-17 Fri | 100 | 0 | 0 | — | 79.1° 01:10 | 9.92 | 12% | 128.5° |
| 2025-10-18 Sat | 100 | 1 | 1 | — | 79.1° 01:05 | 9.96 | 6% | 139.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-09-19&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.