← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-04-15 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° |
| 2041-05-04 Sat | 1 | — | unknown | — | 89.6° 11:10 | 6.17 | 21% | 71.8° |
| 2041-05-05 Sun | 2 | — | unknown | — | 89.5° 11:10 | 6.11 | 29% | 81.7° |
| 2041-05-06 Mon | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.7° 11:05 | 6.05 | 38% | 91.6° |
| 2041-05-07 Tue | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.8° 11:00 | 6.0 | 48% | 101.4° |
| 2041-05-08 Wed | 2 | — | unknown | 04:50–05:00 (marginal, 0.17 h) | 89.7° 10:55 | 5.94 | 57% | 110.9° |
| 2041-05-09 Thu | 2 | — | unknown | 04:50–05:00 (marginal, 0.17 h) | 89.6° 10:50 | 5.89 | 66% | 120.1° |
| 2041-05-10 Fri | 3 | — | unknown | 04:45–05:00 (marginal, 0.25 h) | 89.6° 10:50 | 5.83 | 75% | 128.7° |
| 2041-05-11 Sat | 3 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.8° 10:45 | 5.77 | 83% | 136.3° |
| 2041-05-12 Sun | 3 | — | unknown | 04:45–04:55 (marginal, 0.17 h) | 89.8° 10:40 | 5.72 | 90% | 142.2° |
| 2041-05-13 Mon | 4 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.7° 10:35 | 5.67 | 95% | 145.1° |
| 2041-05-14 Tue | 4 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.5° 10:30 | 5.61 | 99% | 144.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-04-15&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.