← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-04-04 Thu | 0 | — | unknown | — | 89.7° 13:15 | 7.9 | 18% | 47.3° |
| 2041-04-05 Fri | 0 | — | unknown | — | 89.8° 13:10 | 7.84 | 26% | 56.1° |
| 2041-04-06 Sat | 0 | — | unknown | — | 89.8° 13:05 | 7.78 | 36% | 65.6° |
| 2041-04-07 Sun | 0 | — | unknown | — | 89.6° 13:00 | 7.73 | 46% | 75.4° |
| 2041-04-08 Mon | 0 | — | unknown | — | 89.6° 13:00 | 7.67 | 55% | 85.2° |
| 2041-04-09 Tue | 0 | — | unknown | — | 89.7° 12:55 | 7.62 | 64% | 94.9° |
| 2041-04-10 Wed | 0 | — | unknown | — | 89.8° 12:50 | 7.56 | 73% | 104.6° |
| 2041-04-11 Thu | 0 | — | unknown | — | 89.7° 12:45 | 7.5 | 81% | 114.0° |
| 2041-04-12 Fri | 0 | — | unknown | — | 89.5° 12:40 | 7.44 | 88% | 123.0° |
| 2041-04-13 Sat | 0 | — | unknown | — | 89.6° 12:40 | 7.39 | 94% | 131.4° |
| 2041-04-14 Sun | 0 | — | unknown | — | 89.8° 12:35 | 7.33 | 98% | 138.6° |
| 2041-04-15 Mon | 0 | — | unknown | — | 89.8° 12:30 | 7.27 | 100% | 143.6° |
| 2041-04-16 Tue | 0 | — | unknown | — | 89.7° 12:25 | 7.21 | 100% | 145.2° |
| 2041-04-17 Wed | 0 | — | unknown | — | 89.5° 12:25 | 7.16 | 98% | 142.9° |
| 2041-04-18 Thu | 0 | — | unknown | — | 89.7° 12:20 | 7.1 | 94% | 137.0° |
| 2041-04-19 Fri | 0 | — | unknown | — | 89.8° 12:15 | 7.04 | 88% | 128.7° |
| 2041-04-20 Sat | 0 | — | unknown | — | 89.8° 12:10 | 6.98 | 79% | 118.9° |
| 2041-04-21 Sun | 0 | — | unknown | — | 89.6° 12:05 | 6.92 | 70% | 108.2° |
| 2041-04-22 Mon | 0 | — | unknown | — | 89.7° 12:00 | 6.87 | 59% | 97.0° |
| 2041-04-23 Tue | 0 | — | unknown | — | 89.8° 11:55 | 6.81 | 48% | 85.4° |
| 2041-04-24 Wed | 0 | — | unknown | — | 89.7° 11:50 | 6.75 | 36% | 73.9° |
| 2041-04-25 Thu | 0 | — | unknown | — | 89.6° 11:45 | 6.69 | 26% | 62.6° |
| 2041-04-26 Fri | 1 | — | unknown | — | 89.6° 11:45 | 6.63 | 16% | 52.1° |
| 2041-04-27 Sat | 1 | — | unknown | — | 89.8° 11:40 | 6.57 | 8% | 43.0° |
| 2041-04-28 Sun | 1 | — | unknown | — | 89.8° 11:35 | 6.52 | 3% | 36.8° |
| 2041-04-29 Mon | 1 | — | unknown | — | 89.7° 11:30 | 6.46 | 0% | 34.8° |
| 2041-04-30 Tue | 1 | — | unknown | — | 89.5° 11:25 | 6.4 | 0% | 37.6° |
| 2041-05-01 Wed | 1 | — | unknown | — | 89.7° 11:25 | 6.34 | 2% | 44.0° |
| 2041-05-02 Thu | 1 | — | unknown | — | 89.8° 11:20 | 6.28 | 7% | 52.5° |
| 2041-05-03 Fri | 1 | — | unknown | — | 89.8° 11:15 | 6.23 | 13% | 61.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-04-04&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.