← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-08-15 Thu | 0 | — | unknown | — | 50.1° 16:15 | 6.66 | 79% | 168.1° |
| 2041-08-16 Fri | 0 | — | unknown | — | 50.1° 16:10 | 6.72 | 69% | 153.9° |
| 2041-08-17 Sat | 0 | — | unknown | — | 50.1° 16:05 | 6.78 | 59% | 140.1° |
| 2041-08-18 Sun | 0 | — | unknown | — | 50.1° 16:05 | 6.84 | 48% | 126.8° |
| 2041-08-19 Mon | 0 | — | unknown | — | 50.1° 16:00 | 6.89 | 38% | 113.8° |
| 2041-08-20 Tue | 0 | — | unknown | — | 50.1° 15:55 | 6.95 | 28% | 101.2° |
| 2041-08-21 Wed | 0 | — | unknown | — | 50.1° 15:50 | 7.01 | 20% | 88.8° |
| 2041-08-22 Thu | 0 | — | unknown | — | 50.1° 15:45 | 7.07 | 12% | 76.6° |
| 2041-08-23 Fri | 0 | — | unknown | — | 50.1° 15:45 | 7.12 | 7% | 64.5° |
| 2041-08-24 Sat | 0 | — | unknown | — | 50.1° 15:40 | 7.18 | 3% | 52.6° |
| 2041-08-25 Sun | 0 | — | unknown | — | 50.1° 15:35 | 7.24 | 1% | 40.8° |
| 2041-08-26 Mon | 0 | — | unknown | — | 50.1° 15:30 | 7.29 | 0% | 29.0° |
| 2041-08-27 Tue | 0 | — | unknown | — | 50.1° 15:30 | 7.35 | 2% | 17.2° |
| 2041-08-28 Wed | 0 | — | unknown | — | 50.1° 15:25 | 7.41 | 5% | 5.6° |
| 2041-08-29 Thu | 0 | — | unknown | — | 50.1° 15:20 | 7.46 | 9% | 7.0° |
| 2041-08-30 Fri | 0 | — | unknown | — | 50.1° 15:15 | 7.52 | 16% | 18.8° |
| 2041-08-31 Sat | 0 | — | unknown | — | 50.1° 15:10 | 7.58 | 23% | 30.9° |
| 2041-09-01 Sun | 0 | — | unknown | — | 50.1° 15:10 | 7.63 | 32% | 43.3° |
| 2041-09-02 Mon | 0 | — | unknown | — | 50.1° 15:05 | 7.69 | 42% | 55.9° |
| 2041-09-03 Tue | 0 | — | unknown | — | 50.1° 15:00 | 7.74 | 52% | 68.8° |
| 2041-09-04 Wed | 0 | — | unknown | — | 50.1° 14:55 | 7.8 | 63% | 82.2° |
| 2041-09-05 Thu | 0 | — | unknown | — | 50.1° 14:50 | 7.85 | 73% | 96.0° |
| 2041-09-06 Fri | 0 | — | unknown | — | 50.1° 14:50 | 7.91 | 83% | 110.3° |
| 2041-09-07 Sat | 0 | — | unknown | — | 50.1° 14:45 | 7.96 | 91% | 125.0° |
| 2041-09-08 Sun | 0 | — | unknown | — | 50.1° 14:40 | 8.02 | 96% | 140.0° |
| 2041-09-09 Mon | 0 | — | unknown | — | 50.1° 14:35 | 8.07 | 100% | 155.2° |
| 2041-09-10 Tue | 0 | — | unknown | — | 50.1° 14:35 | 8.13 | 100% | 170.3° |
| 2041-09-11 Wed | 0 | — | unknown | — | 50.1° 14:30 | 8.18 | 96% | 174.0° |
| 2041-09-12 Thu | 0 | — | unknown | — | 50.1° 14:25 | 8.23 | 91% | 159.4° |
| 2041-09-13 Fri | 0 | — | unknown | — | 50.1° 14:20 | 8.29 | 83% | 145.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-08-15&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.