← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-09 Sat | 0 | 0 | 0 | — | 79.1° 11:45 | 5.91 | 50% | 74.9° |
| 2026-05-10 Sun | 0 | 0 | 0 | — | 79.1° 11:40 | 5.85 | 40% | 62.7° |
| 2026-05-11 Mon | 0 | 0 | 0 | — | 79.1° 11:35 | 5.79 | 30% | 50.3° |
| 2026-05-12 Tue | 0 | 0 | 0 | — | 79.1° 11:30 | 5.74 | 20% | 37.8° |
| 2026-05-13 Wed | 0 | 0 | 0 | — | 79.1° 11:30 | 5.68 | 12% | 25.7° |
| 2026-05-14 Thu | 0 | 0 | 0 | — | 79.1° 11:25 | 5.63 | 5% | 16.4° |
| 2026-05-15 Fri | 0 | 0 | 0 | — | 79.1° 11:20 | 5.58 | 1% | 17.2° |
| 2026-05-16 Sat | 0 | 99 | 0 | — | 79.1° 11:15 | 5.52 | 0% | 27.6° |
| 2026-05-17 Sun | 0 | 0 | 0 | — | 79.1° 11:10 | 5.47 | 2% | 41.0° |
| 2026-05-18 Mon | 0 | 0 | 0 | — | 79.1° 11:10 | 5.42 | 7% | 55.1° |
| 2026-05-19 Tue | 0 | 0 | 0 | — | 79.1° 11:05 | 5.37 | 14% | 69.3° |
| 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° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-09&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.