← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-12-22 Sun | 23 | — | unknown | 18:35–19:25 (good, 0.83 h) | 71.1° 14:20 | 11.51 | 0% | 60.1° |
| 2041-12-23 Mon | 21 | — | unknown | 18:40–19:20 (good, 0.67 h) | 71.1° 14:15 | 11.51 | 1% | 53.5° |
| 2041-12-24 Tue | 20 | — | unknown | 18:40–19:15 (good, 0.58 h) | 71.1° 14:10 | 11.5 | 3% | 49.0° |
| 2041-12-25 Wed | 18 | — | unknown | 18:40–19:10 (good, 0.5 h) | 71.1° 14:05 | 11.5 | 9% | 47.2° |
| 2041-12-26 Thu | 15 | — | unknown | 18:40–19:05 (good, 0.42 h) | 71.1° 14:00 | 11.49 | 16% | 48.7° |
| 2041-12-27 Fri | 12 | — | unknown | 18:40–18:55 (good, 0.25 h) | 71.1° 14:00 | 11.49 | 26% | 53.1° |
| 2041-12-28 Sat | 10 | — | unknown | 18:40–18:45 (good, 0.08 h) | 71.1° 13:55 | 11.48 | 36% | 59.8° |
| 2041-12-29 Sun | 8 | — | unknown | 18:40–19:25 (marginal, 0.75 h) | 71.1° 13:50 | 11.48 | 48% | 67.9° |
| 2041-12-30 Mon | 6 | — | unknown | 18:40–19:20 (marginal, 0.67 h) | 71.1° 13:45 | 11.47 | 59% | 76.8° |
| 2041-12-31 Tue | 5 | — | unknown | 18:45–19:15 (marginal, 0.5 h) | 71.1° 13:40 | 11.46 | 70% | 86.2° |
| 2042-01-01 Wed | 4 | — | unknown | 18:45–19:10 (marginal, 0.42 h) | 71.1° 13:40 | 11.45 | 79% | 95.5° |
| 2042-01-02 Thu | 4 | — | unknown | 18:45–19:10 (marginal, 0.42 h) | 71.1° 13:35 | 11.44 | 87% | 104.5° |
| 2042-01-03 Fri | 4 | — | unknown | 18:45–19:05 (marginal, 0.33 h) | 71.1° 13:30 | 11.43 | 94% | 113.0° |
| 2042-01-04 Sat | 3 | — | unknown | 18:45–19:00 (marginal, 0.25 h) | 71.1° 13:25 | 11.41 | 98% | 120.5° |
| 2042-01-05 Sun | 3 | — | unknown | 18:45–18:55 (marginal, 0.17 h) | 71.1° 13:25 | 11.4 | 100% | 126.6° |
| 2042-01-06 Mon | 2 | — | unknown | — | 71.1° 13:20 | 11.39 | 100% | 130.9° |
| 2042-01-07 Tue | 1 | — | unknown | — | 71.1° 13:15 | 11.37 | 97% | 132.8° |
| 2042-01-08 Wed | 1 | — | unknown | — | 71.1° 13:10 | 11.36 | 93% | 132.2° |
| 2042-01-09 Thu | 1 | — | unknown | — | 71.1° 13:05 | 11.34 | 88% | 129.4° |
| 2042-01-10 Fri | 1 | — | unknown | — | 71.1° 13:05 | 11.32 | 81% | 124.7° |
| 2042-01-11 Sat | 1 | — | unknown | — | 71.1° 13:00 | 11.3 | 73% | 118.8° |
| 2042-01-12 Sun | 0 | — | unknown | — | 71.1° 12:55 | 11.28 | 64% | 111.9° |
| 2042-01-13 Mon | 0 | — | unknown | — | 71.1° 12:50 | 11.26 | 55% | 104.3° |
| 2042-01-14 Tue | 0 | — | unknown | — | 71.1° 12:45 | 11.24 | 46% | 96.4° |
| 2042-01-15 Wed | 0 | — | unknown | — | 71.1° 12:45 | 11.22 | 36% | 88.1° |
| 2042-01-16 Thu | 0 | — | unknown | — | 71.1° 12:40 | 11.2 | 27% | 79.7° |
| 2042-01-17 Fri | 0 | — | unknown | — | 71.1° 12:35 | 11.18 | 18% | 71.3° |
| 2042-01-18 Sat | 0 | — | unknown | — | 71.1° 12:30 | 11.15 | 11% | 63.2° |
| 2042-01-19 Sun | 0 | — | unknown | — | 71.1° 12:30 | 11.13 | 5% | 56.1° |
| 2042-01-20 Mon | 0 | — | unknown | — | 71.1° 12:25 | 11.1 | 1% | 50.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-12-22&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.