← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-20 Wed | 0 | 62 | 0 | — | 79.1° 11:00 | 5.32 | 23% | 83.4° |
| 2026-05-21 Thu | 0 | 0 | 0 | — | 79.1° 10:55 | 5.27 | 33% | 97.1° |
| 2026-05-22 Fri | 0 | 0 | 0 | — | 79.1° 10:55 | 5.22 | 44% | 110.3° |
| 2026-05-23 Sat | 0 | 45 | 0 | — | 79.1° 10:50 | 5.17 | 55% | 123.1° |
| 2026-05-24 Sun | 0 | 81 | 0 | — | 79.1° 10:45 | 5.13 | 65% | 135.3° |
| 2026-05-25 Mon | 0 | 58 | 0 | — | 79.1° 10:40 | 5.08 | 74% | 146.8° |
| 2026-05-26 Tue | 0 | 94 | 0 | — | 79.1° 10:35 | 5.04 | 83% | 157.1° |
| 2026-05-27 Wed | 0 | 95 | 0 | — | 79.1° 10:35 | 4.99 | 89% | 164.1° |
| 2026-05-28 Thu | 0 | 100 | 0 | — | 79.1° 10:30 | 4.95 | 94% | 163.5° |
| 2026-05-29 Fri | 0 | 93 | 0 | — | 79.1° 10:25 | 4.91 | 98% | 156.1° |
| 2026-05-30 Sat | 1 | 61 | 1 | — | 79.1° 10:20 | 4.87 | 100% | 146.1° |
| 2026-05-31 Sun | 1 | 92 | 1 | — | 79.1° 10:15 | 4.83 | 100% | 135.3° |
| 2026-06-01 Mon | 1 | 74 | 1 | — | 79.1° 10:15 | 4.79 | 98% | 124.2° |
| 2026-06-02 Tue | 1 | 79 | 1 | — | 79.1° 10:10 | 4.76 | 94% | 112.9° |
| 2026-06-03 Wed | 1 | 46 | 0 | — | 79.1° 10:05 | 4.73 | 89% | 101.4° |
| 2026-06-04 Thu | 1 | 37 | 0 | — | 79.1° 10:00 | 4.69 | 82% | 89.8° |
| 2026-06-05 Fri | 1 | 93 | 1 | — | 79.1° 10:00 | 4.66 | 74% | 78.1° |
| 2026-06-06 Sat | 1 | 98 | 1 | — | 79.1° 09:55 | 4.63 | 65% | 66.2° |
| 2026-06-07 Sun | 1 | 99 | 1 | — | 79.1° 09:50 | 4.61 | 55% | 54.1° |
| 2026-06-08 Mon | 1 | 3 | 0 | — | 79.1° 09:45 | 4.58 | 45% | 41.9° |
| 2026-06-09 Tue | 2 | 99 | 2 | — | 79.1° 09:40 | 4.56 | 34% | 29.9° |
| 2026-06-10 Wed | 2 | 100 | 2 | 04:25–04:30 (marginal, 0.08 h) | 79.1° 09:40 | 4.53 | 24% | 19.3° |
| 2026-06-11 Thu | 3 | 0 | 0 | — | 79.1° 09:35 | 4.51 | 15% | 15.1° |
| 2026-06-12 Fri | 4 | 0 | 0 | — | 79.1° 09:30 | 4.49 | 7% | 22.4° |
| 2026-06-13 Sat | 5 | 97 | 5 | 04:00–04:30 (marginal, 0.5 h) | 79.1° 09:25 | 4.48 | 2% | 34.9° |
| 2026-06-14 Sun | 6 | 99 | 6 | 03:55–04:30 (marginal, 0.58 h) | 79.1° 09:20 | 4.46 | 0% | 48.9° |
| 2026-06-15 Mon | 7 | 45 | 3 | 03:20–03:40 (marginal, 0.33 h) | 79.1° 09:20 | 4.45 | 1% | 63.3° |
| 2026-06-16 Tue | 7 | 0 | 0 | — | 79.1° 09:15 | 4.44 | 5% | 77.8° |
| 2026-06-17 Wed | 8 | 94 | 8 | 03:55–04:30 (marginal, 0.58 h) | 79.1° 09:10 | 4.43 | 12% | 92.1° |
| 2026-06-18 Thu | 10 | 48 | 5 | 03:10–03:40 (marginal, 0.5 h) | 79.1° 09:05 | 4.43 | 20% | 106.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-20&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.