← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-04-18 Wed | 0 | — | unknown | — | 79.2° 13:10 | 7.08 | 44% | 78.6° |
| 2040-04-19 Thu | 0 | — | unknown | — | 79.2° 13:05 | 7.03 | 54% | 89.6° |
| 2040-04-20 Fri | 0 | — | unknown | — | 79.2° 13:00 | 6.97 | 63% | 100.7° |
| 2040-04-21 Sat | 0 | — | unknown | — | 79.2° 12:55 | 6.91 | 72% | 112.0° |
| 2040-04-22 Sun | 0 | — | unknown | — | 79.2° 12:55 | 6.85 | 81% | 123.3° |
| 2040-04-23 Mon | 0 | — | unknown | — | 79.2° 12:50 | 6.79 | 88% | 134.5° |
| 2040-04-24 Tue | 0 | — | unknown | — | 79.2° 12:45 | 6.74 | 94% | 145.2° |
| 2040-04-25 Wed | 0 | — | unknown | — | 79.2° 12:40 | 6.68 | 98% | 154.1° |
| 2040-04-26 Thu | 0 | — | unknown | — | 79.2° 12:35 | 6.62 | 100% | 158.0° |
| 2040-04-27 Fri | 0 | — | unknown | — | 79.2° 12:35 | 6.56 | 99% | 154.1° |
| 2040-04-28 Sat | 0 | — | unknown | — | 79.2° 12:30 | 6.5 | 96% | 144.6° |
| 2040-04-29 Sun | 0 | — | unknown | — | 79.2° 12:25 | 6.44 | 90% | 132.7° |
| 2040-04-30 Mon | 0 | — | unknown | — | 79.2° 12:20 | 6.39 | 81% | 119.8° |
| 2040-05-01 Tue | 0 | — | unknown | — | 79.2° 12:15 | 6.33 | 71% | 106.6° |
| 2040-05-02 Wed | 0 | — | unknown | — | 79.2° 12:15 | 6.27 | 60% | 93.4° |
| 2040-05-03 Thu | 0 | — | unknown | — | 79.2° 12:10 | 6.21 | 49% | 80.4° |
| 2040-05-04 Fri | 0 | — | unknown | — | 79.2° 12:05 | 6.16 | 38% | 67.6° |
| 2040-05-05 Sat | 0 | — | unknown | — | 79.2° 12:00 | 6.1 | 27% | 55.2° |
| 2040-05-06 Sun | 0 | — | unknown | — | 79.2° 11:55 | 6.04 | 18% | 43.5° |
| 2040-05-07 Mon | 0 | — | unknown | — | 79.2° 11:50 | 5.98 | 11% | 33.0° |
| 2040-05-08 Tue | 0 | — | unknown | — | 79.2° 11:45 | 5.93 | 5% | 25.0° |
| 2040-05-09 Wed | 0 | — | unknown | — | 79.2° 11:40 | 5.87 | 2% | 22.0° |
| 2040-05-10 Thu | 0 | — | unknown | — | 79.2° 11:40 | 5.82 | 0% | 25.5° |
| 2040-05-11 Fri | 0 | — | unknown | — | 79.2° 11:35 | 5.76 | 1% | 33.4° |
| 2040-05-12 Sat | 0 | — | unknown | — | 79.2° 11:30 | 5.71 | 3% | 43.1° |
| 2040-05-13 Sun | 0 | — | unknown | — | 79.2° 11:25 | 5.65 | 7% | 53.5° |
| 2040-05-14 Mon | 0 | — | unknown | — | 79.2° 11:20 | 5.6 | 13% | 64.2° |
| 2040-05-15 Tue | 0 | — | unknown | — | 79.2° 11:20 | 5.55 | 20% | 75.1° |
| 2040-05-16 Wed | 0 | — | unknown | — | 79.2° 11:15 | 5.49 | 28% | 86.0° |
| 2040-05-17 Thu | 0 | — | unknown | — | 79.2° 11:10 | 5.44 | 37% | 97.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-04-18&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.