← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-04-19 Sun | 0 | 98 | 0 | — | 42.9° 17:05 | 7.06 | 9% | 38.5° |
| 2026-04-20 Mon | 0 | 0 | 0 | — | 42.9° 17:05 | 7.0 | 16% | 34.0° |
| 2026-04-21 Tue | 0 | 0 | 0 | — | 42.9° 17:00 | 6.95 | 26% | 34.7° |
| 2026-04-22 Wed | 0 | 0 | 0 | — | 42.9° 16:55 | 6.89 | 37% | 40.2° |
| 2026-04-23 Thu | 0 | 0 | 0 | — | 42.9° 16:50 | 6.83 | 48% | 48.7° |
| 2026-04-24 Fri | 0 | 0 | 0 | — | 42.9° 16:45 | 6.77 | 59% | 58.6° |
| 2026-04-25 Sat | 0 | 0 | 0 | — | 42.9° 16:45 | 6.71 | 69% | 69.1° |
| 2026-04-26 Sun | 0 | 0 | 0 | — | 42.9° 16:40 | 6.65 | 78% | 79.8° |
| 2026-04-27 Mon | 0 | 0 | 0 | — | 42.9° 16:35 | 6.6 | 86% | 90.5° |
| 2026-04-28 Tue | 0 | 0 | 0 | — | 42.9° 16:30 | 6.54 | 92% | 101.0° |
| 2026-04-29 Wed | 0 | 0 | 0 | — | 42.9° 16:30 | 6.48 | 97% | 111.2° |
| 2026-04-30 Thu | 0 | 0 | 0 | — | 42.9° 16:25 | 6.42 | 99% | 120.8° |
| 2026-05-01 Fri | 0 | 0 | 0 | — | 42.9° 16:20 | 6.36 | 100% | 129.7° |
| 2026-05-02 Sat | 0 | 0 | 0 | — | 42.9° 16:15 | 6.31 | 98% | 137.4° |
| 2026-05-03 Sun | 0 | 0 | 0 | — | 42.9° 16:10 | 6.25 | 95% | 143.3° |
| 2026-05-04 Mon | 0 | 0 | 0 | — | 42.9° 16:10 | 6.19 | 91% | 146.3° |
| 2026-05-05 Tue | 0 | 0 | 0 | — | 42.9° 16:05 | 6.13 | 84% | 145.8° |
| 2026-05-06 Wed | 0 | 0 | 0 | — | 42.9° 16:00 | 6.08 | 77% | 141.8° |
| 2026-05-07 Thu | 0 | 0 | 0 | — | 42.9° 15:55 | 6.02 | 69% | 135.4° |
| 2026-05-08 Fri | 0 | 0 | 0 | — | 42.9° 15:50 | 5.96 | 59% | 127.2° |
| 2026-05-09 Sat | 0 | 0 | 0 | — | 42.9° 15:50 | 5.91 | 50% | 117.9° |
| 2026-05-10 Sun | 0 | 0 | 0 | — | 42.9° 15:45 | 5.85 | 40% | 107.8° |
| 2026-05-11 Mon | 0 | 0 | 0 | — | 42.9° 15:40 | 5.79 | 30% | 97.0° |
| 2026-05-12 Tue | 0 | 0 | 0 | — | 42.9° 15:35 | 5.74 | 20% | 85.7° |
| 2026-05-13 Wed | 0 | 0 | 0 | — | 42.9° 15:30 | 5.68 | 12% | 74.1° |
| 2026-05-14 Thu | 0 | 0 | 0 | — | 42.9° 15:30 | 5.63 | 5% | 62.5° |
| 2026-05-15 Fri | 0 | 0 | 0 | — | 42.9° 15:25 | 5.58 | 1% | 51.4° |
| 2026-05-16 Sat | 0 | 0 | 0 | — | 42.9° 15:20 | 5.52 | 0% | 41.7° |
| 2026-05-17 Sun | 0 | 0 | 0 | — | 42.9° 15:15 | 5.47 | 2% | 35.1° |
| 2026-05-18 Mon | 0 | 0 | 0 | — | 42.9° 15:15 | 5.42 | 7% | 33.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-04-19&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.