← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-09-17 Tue | 0 | — | unknown | — | 50.1° 14:05 | 8.5 | 43% | 92.0° |
| 2041-09-18 Wed | 0 | — | unknown | — | 50.1° 14:00 | 8.55 | 33% | 79.7° |
| 2041-09-19 Thu | 0 | — | unknown | — | 50.1° 13:55 | 8.6 | 25% | 67.6° |
| 2041-09-20 Fri | 0 | — | unknown | — | 50.1° 13:55 | 8.65 | 17% | 55.6° |
| 2041-09-21 Sat | 0 | — | unknown | — | 50.1° 13:50 | 8.7 | 10% | 43.8° |
| 2041-09-22 Sun | 0 | — | unknown | — | 50.1° 13:45 | 8.75 | 5% | 32.0° |
| 2041-09-23 Mon | 0 | — | unknown | — | 50.1° 13:40 | 8.8 | 2% | 20.2° |
| 2041-09-24 Tue | 0 | — | unknown | — | 50.1° 13:40 | 8.85 | 0% | 8.5° |
| 2041-09-25 Wed | 0 | — | unknown | — | 50.1° 13:35 | 8.9 | 0% | 4.2° |
| 2041-09-26 Thu | 0 | — | unknown | — | 50.1° 13:30 | 8.95 | 2% | 15.9° |
| 2041-09-27 Fri | 0 | — | unknown | — | 50.1° 13:25 | 9.0 | 6% | 28.0° |
| 2041-09-28 Sat | 0 | — | unknown | — | 50.1° 13:20 | 9.05 | 12% | 40.3° |
| 2041-09-29 Sun | 0 | — | unknown | — | 50.1° 13:20 | 9.1 | 19% | 52.8° |
| 2041-09-30 Mon | 0 | — | unknown | — | 50.1° 13:15 | 9.15 | 27% | 65.5° |
| 2041-10-01 Tue | 0 | — | unknown | — | 50.1° 13:10 | 9.2 | 37% | 78.5° |
| 2041-10-02 Wed | 0 | — | unknown | — | 50.1° 13:05 | 9.24 | 48% | 91.8° |
| 2041-10-03 Thu | 0 | — | unknown | — | 50.1° 13:00 | 9.29 | 59% | 105.4° |
| 2041-10-04 Fri | 0 | — | unknown | — | 50.1° 13:00 | 9.34 | 70% | 119.5° |
| 2041-10-05 Sat | 0 | — | unknown | — | 50.1° 12:55 | 9.39 | 80% | 133.9° |
| 2041-10-06 Sun | 0 | — | unknown | — | 50.1° 12:50 | 9.43 | 88% | 148.6° |
| 2041-10-07 Mon | 0 | — | unknown | — | 50.1° 12:45 | 9.48 | 95% | 163.5° |
| 2041-10-08 Tue | 0 | — | unknown | — | 50.1° 12:45 | 9.53 | 99% | 177.5° |
| 2041-10-09 Wed | 0 | — | unknown | — | 50.1° 12:40 | 9.57 | 100% | 166.2° |
| 2041-10-10 Thu | 0 | — | unknown | — | 50.1° 12:35 | 9.62 | 98% | 151.5° |
| 2041-10-11 Fri | 0 | — | unknown | — | 50.1° 12:30 | 9.66 | 94% | 137.0° |
| 2041-10-12 Sat | 0 | — | unknown | — | 50.1° 12:25 | 9.71 | 87% | 123.0° |
| 2041-10-13 Sun | 0 | — | unknown | — | 50.1° 12:25 | 9.75 | 78% | 109.4° |
| 2041-10-14 Mon | 0 | — | unknown | — | 50.1° 12:20 | 9.79 | 69% | 96.2° |
| 2041-10-15 Tue | 0 | — | unknown | — | 50.1° 12:15 | 9.84 | 60% | 83.5° |
| 2041-10-16 Wed | 0 | — | unknown | — | 50.1° 12:10 | 9.88 | 50% | 71.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-09-17&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.