← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-06-20 Sat | 12 | 100 | 12 | 03:30–03:40 (good, 0.17 h) | 79.1° 09:00 | 4.42 | 40% | 132.1° |
| 2026-06-21 Sun | 13 | 100 | 13 | 03:25–03:40 (good, 0.25 h) | 79.1° 08:55 | 4.42 | 50% | 144.0° |
| 2026-06-22 Mon | 15 | 75 | 11 | 02:55–03:40 (marginal, 0.75 h) | 79.1° 08:50 | 4.42 | 60% | 154.9° |
| 2026-06-23 Tue | 17 | 70 | 12 | 02:50–03:40 (marginal, 0.83 h) | 79.1° 08:45 | 4.43 | 70% | 163.1° |
| 2026-06-24 Wed | 18 | 96 | 17 | 03:20–03:40 (good, 0.33 h) | 79.1° 08:45 | 4.43 | 78% | 164.6° |
| 2026-06-25 Thu | 20 | 90 | 18 | 03:25–03:40 (good, 0.25 h) | 79.1° 08:40 | 4.44 | 86% | 158.3° |
| 2026-06-26 Fri | 21 | 99 | 21 | 03:15–03:40 (good, 0.42 h) | 79.1° 08:35 | 4.45 | 92% | 148.7° |
| 2026-06-27 Sat | 20 | 14 | 3 | 02:35–03:00 (marginal, 0.42 h) | 79.1° 08:30 | 4.47 | 96% | 138.0° |
| 2026-06-28 Sun | 21 | 100 | 21 | 03:10–03:40 (good, 0.5 h) | 79.1° 08:25 | 4.48 | 99% | 127.0° |
| 2026-06-29 Mon | 20 | 94 | 19 | 03:15–03:40 (good, 0.42 h) | 79.1° 08:25 | 4.5 | 100% | 115.6° |
| 2026-06-30 Tue | 19 | 94 | 18 | 03:20–03:45 (good, 0.42 h) | 79.1° 08:20 | 4.52 | 99% | 104.2° |
| 2026-07-01 Wed | 17 | 40 | 7 | 03:00–03:45 (marginal, 0.75 h) | 79.1° 08:15 | 4.54 | 96% | 92.6° |
| 2026-07-02 Thu | 15 | 79 | 12 | 02:30–03:45 (marginal, 1.25 h) | 79.1° 08:10 | 4.56 | 92% | 80.8° |
| 2026-07-03 Fri | 14 | 54 | 8 | 02:55–03:00 (marginal, 0.08 h) | 79.1° 08:05 | 4.58 | 86% | 68.9° |
| 2026-07-04 Sat | 13 | 91 | 12 | 02:35–03:45 (marginal, 1.17 h) | 79.1° 08:05 | 4.61 | 78% | 56.9° |
| 2026-07-05 Sun | 14 | 90 | 13 | 02:20–03:45 (marginal, 1.42 h) | 79.1° 08:00 | 4.64 | 70% | 44.9° |
| 2026-07-06 Mon | 16 | 98 | 16 | 02:05–03:50 (marginal, 1.75 h) | 79.1° 07:55 | 4.67 | 59% | 33.0° |
| 2026-07-07 Tue | 20 | 99 | 20 | 01:55–04:40 (marginal, 2.75 h) | 79.1° 07:50 | 4.7 | 49% | 22.0° |
| 2026-07-08 Wed | 26 | 0 | 0 | — | 79.1° 07:50 | 4.73 | 38% | 15.0° |
| 2026-07-09 Thu | 31 | 91 | 28 | 02:35–03:50 (good, 1.25 h) | 79.1° 07:45 | 4.76 | 27% | 18.6° |
| 2026-07-10 Fri | 39 | 100 | 39 | 02:15–03:55 (good, 1.67 h) | 79.1° 07:40 | 4.8 | 17% | 29.6° |
| 2026-07-11 Sat | 46 | 100 | 46 | 02:10–03:55 (good, 1.75 h) | 79.1° 07:35 | 4.84 | 9% | 42.9° |
| 2026-07-12 Sun | 50 | 95 | 48 | 02:10–03:55 (good, 1.75 h) | 79.1° 07:30 | 4.87 | 3% | 57.0° |
| 2026-07-13 Mon | 52 | 89 | 47 | 02:10–03:55 (good, 1.75 h) | 79.1° 07:30 | 4.91 | 0% | 71.5° |
| 2026-07-14 Tue | 54 | 99 | 53 | 01:55–04:00 (good, 2.08 h) | 79.1° 07:25 | 4.96 | 0% | 86.0° |
| 2026-07-15 Wed | 57 | 82 | 47 | 02:05–04:00 (good, 1.92 h) | 79.1° 07:20 | 5.0 | 3% | 100.3° |
| 2026-07-16 Thu | 59 | 18 | 11 | 04:00–04:50 (marginal, 0.83 h) | 79.1° 07:15 | 5.04 | 9% | 114.2° |
| 2026-07-17 Fri | 61 | 98 | 60 | 01:50–04:00 (good, 2.17 h) | 79.1° 07:10 | 5.08 | 16% | 127.5° |
| 2026-07-18 Sat | 64 | 90 | 58 | 01:40–04:05 (good, 2.42 h) | 79.1° 07:10 | 5.13 | 25% | 140.2° |
| 2026-07-19 Sun | 66 | 99 | 65 | 01:40–04:05 (good, 2.42 h) | 79.1° 07:05 | 5.18 | 35% | 151.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-06-20&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.