← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-07-28 Tue | 65 | 90 | 59 | 23:00–23:10 (good, 0.17 h) | 87.1° 23:35 | 5.63 | 100% | 65.2° |
| 2026-07-29 Wed | 65 | 100 | 65 | 22:40–02:10 (good, 3.5 h) | 87.1° 23:30 | 5.68 | 100% | 66.3° |
| 2026-07-30 Thu | 68 | 100 | 68 | 22:40–02:05 (good, 3.42 h) | 87.1° 23:25 | 5.74 | 98% | 68.5° |
| 2026-07-31 Fri | 73 | 100 | 73 | 22:35–02:25 (good, 3.83 h) | 87.1° 23:20 | 5.79 | 95% | 71.8° |
| 2026-08-01 Sat | 77 | 100 | 77 | 22:35–02:55 (good, 4.33 h) | 87.1° 23:15 | 5.85 | 89% | 76.0° |
| 2026-08-02 Sun | 82 | 99 | 81 | 22:35–03:35 (good, 5.0 h) | 87.1° 23:15 | 5.9 | 82% | 80.8° |
| 2026-08-03 Mon | 100 | 99 | 99 | 22:30–04:25 (good, 5.92 h) | 87.1° 23:10 | 5.96 | 73% | 86.2° |
| 2026-08-04 Tue | 100 | 95 | 95 | 22:30–04:30 (good, 6.0 h) | 87.1° 23:05 | 6.01 | 63% | 91.9° |
| 2026-08-05 Wed | 100 | 90 | 90 | 22:30–04:30 (good, 6.0 h) | 87.1° 23:00 | 6.07 | 52% | 97.5° |
| 2026-08-06 Thu | 100 | 90 | 90 | 22:25–04:35 (good, 6.17 h) | 87.1° 22:55 | 6.13 | 40% | 102.9° |
| 2026-08-07 Fri | 100 | 97 | 97 | 22:25–04:35 (good, 6.17 h) | 87.1° 22:55 | 6.18 | 30% | 107.7° |
| 2026-08-08 Sat | 100 | 78 | 78 | 22:20–03:00 (good, 4.67 h) | 87.1° 22:50 | 6.24 | 19% | 111.5° |
| 2026-08-09 Sun | 100 | 94 | 94 | 22:20–04:40 (good, 6.33 h) | 87.1° 22:45 | 6.3 | 11% | 114.0° |
| 2026-08-10 Mon | 100 | 98 | 98 | 22:20–04:40 (good, 6.33 h) | 87.1° 22:40 | 6.35 | 5% | 114.8° |
| 2026-08-11 Tue | 100 | 100 | 100 | 22:15–04:35 (good, 6.33 h) | 87.1° 22:40 | 6.41 | 1% | 113.9° |
| 2026-08-12 Wed | 100 | 97 | 97 | 22:15–04:35 (good, 6.33 h) | 87.1° 22:35 | 6.47 | 0% | 111.4° |
| 2026-08-13 Thu | 100 | 35 | 35 | 22:15–01:00 (good, 2.75 h) | 87.1° 22:30 | 6.53 | 2% | 107.6° |
| 2026-08-14 Fri | 100 | 70 | 70 | 22:10–02:00 (good, 3.83 h) | 87.1° 22:25 | 6.58 | 6% | 103.0° |
| 2026-08-15 Sat | 100 | 99 | 99 | 22:10–04:20 (good, 6.17 h) | 87.1° 22:20 | 6.64 | 12% | 97.8° |
| 2026-08-16 Sun | 100 | 100 | 100 | 22:05–04:15 (good, 6.17 h) | 87.1° 22:20 | 6.7 | 20% | 92.4° |
| 2026-08-17 Mon | 100 | 100 | 100 | 22:05–04:15 (good, 6.17 h) | 87.1° 22:15 | 6.76 | 29% | 87.0° |
| 2026-08-18 Tue | 100 | 68 | 68 | 22:05–02:00 (good, 3.92 h) | 87.1° 22:10 | 6.81 | 39% | 82.0° |
| 2026-08-19 Wed | 100 | 100 | 100 | 22:00–04:05 (good, 6.08 h) | 87.1° 22:05 | 6.87 | 48% | 77.3° |
| 2026-08-20 Thu | 100 | 99 | 99 | 22:00–04:00 (good, 6.0 h) | 87.1° 22:00 | 6.93 | 58% | 73.2° |
| 2026-08-21 Fri | 100 | 100 | 100 | 21:55–04:00 (good, 6.08 h) | 87.1° 22:00 | 6.99 | 67% | 69.8° |
| 2026-08-22 Sat | 94 | 89 | 83 | 01:00–03:55 (good, 2.92 h) | 87.1° 21:55 | 7.04 | 76% | 67.2° |
| 2026-08-23 Sun | 86 | 87 | 75 | 23:00–03:40 (good, 4.67 h) | 87.1° 21:50 | 7.1 | 83% | 65.7° |
| 2026-08-24 Mon | 72 | 41 | 29 | 02:00–03:10 (good, 1.17 h) | 87.1° 21:45 | 7.16 | 90% | 65.2° |
| 2026-08-25 Tue | 64 | 97 | 62 | 23:00–01:10 (good, 2.17 h) | 87.1° 21:45 | 7.22 | 95% | 65.9° |
| 2026-08-26 Wed | 62 | 93 | 58 | 21:45–04:00 (marginal, 6.25 h) | 87.1° 21:40 | 7.27 | 98% | 67.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-07-28&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.