← 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 | 44 | 99 | 44 | 02:05–03:40 (good, 1.58 h) | 89.5° 08:10 | 4.42 | 40% | 130.7° |
| 2026-06-21 Sun | 46 | 99 | 46 | 02:00–03:40 (good, 1.67 h) | 89.6° 08:05 | 4.42 | 50% | 140.1° |
| 2026-06-22 Mon | 47 | 84 | 39 | 02:00–03:00 (good, 1.0 h) | 89.7° 08:00 | 4.42 | 60% | 147.1° |
| 2026-06-23 Tue | 48 | 82 | 39 | 02:00–03:00 (good, 1.0 h) | 89.7° 07:55 | 4.43 | 70% | 150.7° |
| 2026-06-24 Wed | 49 | 90 | 44 | 02:15–03:40 (good, 1.42 h) | 89.6° 07:50 | 4.43 | 78% | 149.8° |
| 2026-06-25 Thu | 50 | 91 | 46 | 02:00–03:40 (good, 1.67 h) | 89.5° 07:50 | 4.44 | 86% | 145.0° |
| 2026-06-26 Fri | 52 | 99 | 51 | 01:50–03:40 (good, 1.83 h) | 89.7° 07:45 | 4.45 | 92% | 137.6° |
| 2026-06-27 Sat | 47 | 47 | 22 | 02:10–03:00 (good, 0.83 h) | 89.7° 07:40 | 4.47 | 96% | 128.8° |
| 2026-06-28 Sun | 47 | 100 | 47 | 01:45–03:40 (good, 1.92 h) | 89.7° 07:35 | 4.48 | 99% | 119.3° |
| 2026-06-29 Mon | 43 | 91 | 39 | 02:00–03:40 (good, 1.67 h) | 89.5° 07:30 | 4.5 | 100% | 109.2° |
| 2026-06-30 Tue | 39 | 96 | 37 | 01:50–03:45 (good, 1.92 h) | 89.6° 07:30 | 4.52 | 99% | 98.9° |
| 2026-07-01 Wed | 35 | 27 | 9 | 03:00–03:45 (marginal, 0.75 h) | 89.7° 07:25 | 4.54 | 96% | 88.4° |
| 2026-07-02 Thu | 31 | 79 | 24 | 01:10–03:45 (marginal, 2.58 h) | 89.7° 07:20 | 4.56 | 92% | 77.8° |
| 2026-07-03 Fri | 29 | 49 | 14 | 02:00–03:00 (marginal, 1.0 h) | 89.6° 07:15 | 4.58 | 86% | 67.2° |
| 2026-07-04 Sat | 28 | 87 | 24 | 01:00–03:45 (marginal, 2.75 h) | 89.5° 07:15 | 4.61 | 78% | 56.8° |
| 2026-07-05 Sun | 30 | 90 | 27 | 00:45–03:45 (marginal, 3.0 h) | 89.6° 07:10 | 4.64 | 70% | 46.8° |
| 2026-07-06 Mon | 34 | 98 | 33 | 03:05–03:50 (good, 0.75 h) | 89.7° 07:05 | 4.67 | 59% | 37.8° |
| 2026-07-07 Tue | 41 | 98 | 40 | 01:25–03:50 (good, 2.42 h) | 89.7° 07:00 | 4.7 | 49% | 31.2° |
| 2026-07-08 Wed | 51 | 0 | 0 | — | 89.6° 06:55 | 4.73 | 38% | 29.0° |
| 2026-07-09 Thu | 63 | 92 | 58 | 00:55–03:50 (good, 2.92 h) | 89.5° 06:55 | 4.76 | 27% | 32.7° |
| 2026-07-10 Fri | 76 | 100 | 76 | 00:45–03:55 (good, 3.17 h) | 89.7° 06:50 | 4.8 | 17% | 41.0° |
| 2026-07-11 Sat | 84 | 100 | 84 | 00:40–03:55 (good, 3.25 h) | 89.7° 06:45 | 4.84 | 9% | 51.9° |
| 2026-07-12 Sun | 90 | 91 | 82 | 01:00–03:55 (good, 2.92 h) | 89.7° 06:40 | 4.87 | 3% | 64.2° |
| 2026-07-13 Mon | 92 | 90 | 83 | 00:45–03:55 (good, 3.17 h) | 89.5° 06:35 | 4.91 | 0% | 77.2° |
| 2026-07-14 Tue | 96 | 99 | 95 | 00:30–04:00 (good, 3.5 h) | 89.6° 06:35 | 4.96 | 0% | 90.3° |
| 2026-07-15 Wed | 97 | 63 | 61 | 02:00–04:00 (good, 2.0 h) | 89.7° 06:30 | 5.0 | 3% | 103.2° |
| 2026-07-16 Thu | 99 | 13 | 13 | 04:00–04:50 (marginal, 0.83 h) | 89.7° 06:25 | 5.04 | 9% | 115.5° |
| 2026-07-17 Fri | 100 | 98 | 98 | 00:20–04:00 (good, 3.67 h) | 89.6° 06:20 | 5.08 | 16% | 127.1° |
| 2026-07-18 Sat | 100 | 93 | 93 | 00:15–04:05 (good, 3.83 h) | 89.5° 06:15 | 5.13 | 25% | 137.3° |
| 2026-07-19 Sun | 100 | 99 | 99 | 00:10–04:05 (good, 3.92 h) | 89.6° 06:15 | 5.18 | 35% | 145.4° |
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.