← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-09-12 Wed | 0 | — | unknown | — | 50.1° 14:25 | 8.25 | 37% | 60.3° |
| 2040-09-13 Thu | 0 | — | unknown | — | 50.1° 14:20 | 8.3 | 48% | 74.0° |
| 2040-09-14 Fri | 0 | — | unknown | — | 50.1° 14:15 | 8.35 | 60% | 88.1° |
| 2040-09-15 Sat | 0 | — | unknown | — | 50.1° 14:10 | 8.4 | 70% | 102.3° |
| 2040-09-16 Sun | 0 | — | unknown | — | 50.1° 14:10 | 8.46 | 80% | 116.8° |
| 2040-09-17 Mon | 0 | — | unknown | — | 50.1° 14:05 | 8.51 | 89% | 131.4° |
| 2040-09-18 Tue | 0 | — | unknown | — | 50.1° 14:00 | 8.56 | 95% | 146.1° |
| 2040-09-19 Wed | 0 | — | unknown | — | 50.1° 13:55 | 8.61 | 99% | 160.8° |
| 2040-09-20 Thu | 0 | — | unknown | — | 50.1° 13:50 | 8.66 | 100% | 175.2° |
| 2040-09-21 Fri | 0 | — | unknown | — | 50.1° 13:50 | 8.71 | 98% | 170.5° |
| 2040-09-22 Sat | 0 | — | unknown | — | 50.1° 13:45 | 8.77 | 94% | 156.7° |
| 2040-09-23 Sun | 0 | — | unknown | — | 50.1° 13:40 | 8.82 | 88% | 143.3° |
| 2040-09-24 Mon | 0 | — | unknown | — | 50.1° 13:35 | 8.87 | 80% | 130.2° |
| 2040-09-25 Tue | 0 | — | unknown | — | 50.1° 13:35 | 8.92 | 71% | 117.6° |
| 2040-09-26 Wed | 0 | — | unknown | — | 50.1° 13:30 | 8.97 | 62% | 105.3° |
| 2040-09-27 Thu | 0 | — | unknown | — | 50.1° 13:25 | 9.01 | 53% | 93.2° |
| 2040-09-28 Fri | 0 | — | unknown | — | 50.1° 13:20 | 9.06 | 43% | 81.3° |
| 2040-09-29 Sat | 0 | — | unknown | — | 50.1° 13:15 | 9.11 | 34% | 69.4° |
| 2040-09-30 Sun | 0 | — | unknown | — | 50.1° 13:15 | 9.16 | 25% | 57.6° |
| 2040-10-01 Mon | 0 | — | unknown | — | 50.1° 13:10 | 9.21 | 18% | 45.7° |
| 2040-10-02 Tue | 0 | — | unknown | — | 50.1° 13:05 | 9.26 | 11% | 33.6° |
| 2040-10-03 Wed | 0 | — | unknown | — | 50.1° 13:00 | 9.3 | 6% | 21.4° |
| 2040-10-04 Thu | 0 | — | unknown | — | 50.1° 12:55 | 9.35 | 2% | 8.9° |
| 2040-10-05 Fri | 0 | — | unknown | — | 50.1° 12:55 | 9.4 | 0% | 3.9° |
| 2040-10-06 Sat | 0 | — | unknown | — | 50.1° 12:50 | 9.44 | 1% | 16.9° |
| 2040-10-07 Sun | 0 | — | unknown | — | 50.1° 12:45 | 9.49 | 3% | 30.1° |
| 2040-10-08 Mon | 0 | — | unknown | — | 50.1° 12:40 | 9.54 | 8% | 43.5° |
| 2040-10-09 Tue | 0 | — | unknown | — | 50.1° 12:40 | 9.58 | 15% | 57.1° |
| 2040-10-10 Wed | 0 | — | unknown | — | 50.1° 12:35 | 9.63 | 24% | 70.9° |
| 2040-10-11 Thu | 0 | — | unknown | — | 50.1° 12:30 | 9.67 | 34% | 84.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-09-12&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.