← 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 | 0 | 0 | — | 72.5° 13:15 | 5.32 | 23% | 57.4° |
| 2026-05-21 Thu | 0 | 0 | 0 | — | 72.5° 13:15 | 5.27 | 33% | 71.6° |
| 2026-05-22 Fri | 0 | 0 | 0 | — | 72.5° 13:10 | 5.22 | 44% | 85.3° |
| 2026-05-23 Sat | 0 | 0 | 0 | — | 72.5° 13:05 | 5.17 | 55% | 98.7° |
| 2026-05-24 Sun | 0 | 0 | 0 | — | 72.5° 13:00 | 5.13 | 65% | 111.7° |
| 2026-05-25 Mon | 0 | 0 | 0 | — | 72.5° 12:55 | 5.08 | 74% | 124.3° |
| 2026-05-26 Tue | 0 | 0 | 0 | — | 72.5° 12:55 | 5.04 | 83% | 136.8° |
| 2026-05-27 Wed | 0 | 0 | 0 | — | 72.5° 12:50 | 4.99 | 89% | 149.0° |
| 2026-05-28 Thu | 0 | 0 | 0 | — | 72.5° 12:45 | 4.95 | 94% | 161.1° |
| 2026-05-29 Fri | 0 | 0 | 0 | — | 72.5° 12:40 | 4.91 | 98% | 173.0° |
| 2026-05-30 Sat | 0 | 0 | 0 | — | 72.5° 12:35 | 4.87 | 100% | 174.9° |
| 2026-05-31 Sun | 0 | 0 | 0 | — | 72.5° 12:35 | 4.83 | 100% | 163.2° |
| 2026-06-01 Mon | 0 | 0 | 0 | — | 72.5° 12:30 | 4.79 | 98% | 151.3° |
| 2026-06-02 Tue | 0 | 0 | 0 | — | 72.5° 12:25 | 4.76 | 94% | 139.5° |
| 2026-06-03 Wed | 0 | 0 | 0 | — | 72.5° 12:20 | 4.73 | 89% | 127.6° |
| 2026-06-04 Thu | 0 | 0 | 0 | — | 72.5° 12:20 | 4.69 | 82% | 115.6° |
| 2026-06-05 Fri | 0 | 0 | 0 | — | 72.5° 12:15 | 4.66 | 74% | 103.4° |
| 2026-06-06 Sat | 0 | 0 | 0 | — | 72.5° 12:10 | 4.63 | 65% | 91.0° |
| 2026-06-07 Sun | 0 | 0 | 0 | — | 72.5° 12:05 | 4.61 | 55% | 78.4° |
| 2026-06-08 Mon | 0 | 0 | 0 | — | 72.5° 12:00 | 4.58 | 45% | 65.4° |
| 2026-06-09 Tue | 0 | 0 | 0 | — | 72.5° 11:55 | 4.56 | 34% | 51.9° |
| 2026-06-10 Wed | 0 | 0 | 0 | — | 72.5° 11:50 | 4.53 | 24% | 38.1° |
| 2026-06-11 Thu | 0 | 0 | 0 | — | 72.5° 11:45 | 4.51 | 15% | 23.7° |
| 2026-06-12 Fri | 0 | 0 | 0 | — | 72.5° 11:40 | 4.49 | 7% | 9.0° |
| 2026-06-13 Sat | 0 | 0 | 0 | — | 72.5° 11:40 | 4.48 | 2% | 6.1° |
| 2026-06-14 Sun | 0 | 0 | 0 | — | 72.5° 11:35 | 4.46 | 0% | 21.3° |
| 2026-06-15 Mon | 0 | 0 | 0 | — | 72.5° 11:30 | 4.45 | 1% | 36.6° |
| 2026-06-16 Tue | 0 | 0 | 0 | — | 72.5° 11:25 | 4.44 | 5% | 51.6° |
| 2026-06-17 Wed | 0 | 0 | 0 | — | 72.5° 11:25 | 4.43 | 12% | 66.4° |
| 2026-06-18 Thu | 0 | 0 | 0 | — | 72.5° 11:20 | 4.43 | 20% | 80.8° |
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.