← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-19 Tue | 0 | 0 | 0 | — | 42.9° 15:10 | 5.37 | 14% | 37.8° |
| 2026-05-20 Wed | 0 | 0 | 0 | — | 42.9° 15:05 | 5.32 | 23% | 45.7° |
| 2026-05-21 Thu | 0 | 0 | 0 | — | 42.9° 15:00 | 5.27 | 33% | 55.6° |
| 2026-05-22 Fri | 0 | 0 | 0 | — | 42.9° 14:55 | 5.22 | 44% | 66.3° |
| 2026-05-23 Sat | 0 | 0 | 0 | — | 42.9° 14:55 | 5.17 | 55% | 77.1° |
| 2026-05-24 Sun | 0 | 0 | 0 | — | 42.9° 14:50 | 5.13 | 65% | 87.9° |
| 2026-05-25 Mon | 0 | 0 | 0 | — | 42.9° 14:45 | 5.08 | 74% | 98.5° |
| 2026-05-26 Tue | 0 | 0 | 0 | — | 42.9° 14:40 | 5.04 | 83% | 108.7° |
| 2026-05-27 Wed | 0 | 0 | 0 | — | 42.9° 14:35 | 4.99 | 89% | 118.5° |
| 2026-05-28 Thu | 0 | 0 | 0 | — | 42.9° 14:35 | 4.95 | 94% | 127.6° |
| 2026-05-29 Fri | 0 | 0 | 0 | — | 42.9° 14:30 | 4.91 | 98% | 135.6° |
| 2026-05-30 Sat | 0 | 0 | 0 | — | 42.9° 14:25 | 4.87 | 100% | 142.0° |
| 2026-05-31 Sun | 0 | 0 | 0 | — | 42.9° 14:20 | 4.83 | 100% | 145.9° |
| 2026-06-01 Mon | 0 | 0 | 0 | — | 42.9° 14:20 | 4.79 | 98% | 146.4° |
| 2026-06-02 Tue | 0 | 0 | 0 | — | 42.9° 14:15 | 4.76 | 94% | 143.3° |
| 2026-06-03 Wed | 0 | 0 | 0 | — | 42.9° 14:10 | 4.73 | 89% | 137.4° |
| 2026-06-04 Thu | 0 | 0 | 0 | — | 42.9° 14:05 | 4.69 | 82% | 129.7° |
| 2026-06-05 Fri | 0 | 0 | 0 | — | 42.9° 14:00 | 4.66 | 74% | 120.7° |
| 2026-06-06 Sat | 0 | 0 | 0 | — | 42.9° 14:00 | 4.63 | 65% | 110.9° |
| 2026-06-07 Sun | 0 | 0 | 0 | — | 42.9° 13:55 | 4.61 | 55% | 100.5° |
| 2026-06-08 Mon | 0 | 0 | 0 | — | 42.9° 13:50 | 4.58 | 45% | 89.7° |
| 2026-06-09 Tue | 0 | 0 | 0 | — | 42.9° 13:45 | 4.56 | 34% | 78.5° |
| 2026-06-10 Wed | 0 | 0 | 0 | — | 42.9° 13:40 | 4.53 | 24% | 67.2° |
| 2026-06-11 Thu | 0 | 0 | 0 | — | 42.9° 13:40 | 4.51 | 15% | 56.0° |
| 2026-06-12 Fri | 0 | 0 | 0 | — | 42.9° 13:35 | 4.49 | 7% | 45.7° |
| 2026-06-13 Sat | 0 | 0 | 0 | — | 42.9° 13:30 | 4.48 | 2% | 37.5° |
| 2026-06-14 Sun | 0 | 0 | 0 | — | 42.9° 13:25 | 4.46 | 0% | 33.5° |
| 2026-06-15 Mon | 0 | 0 | 0 | — | 42.9° 13:25 | 4.45 | 1% | 35.3° |
| 2026-06-16 Tue | 0 | 0 | 0 | — | 42.9° 13:20 | 4.44 | 5% | 42.1° |
| 2026-06-17 Wed | 0 | 0 | 0 | — | 42.9° 13:15 | 4.43 | 12% | 51.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-19&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.