← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-01-26 Sat | 0 | — | unknown | — | 71.1° 11:55 | 10.93 | 34% | 78.0° |
| 2041-01-27 Sun | 0 | — | unknown | — | 71.1° 11:50 | 10.9 | 24% | 69.2° |
| 2041-01-28 Mon | 1 | — | unknown | — | 71.1° 11:45 | 10.87 | 15% | 60.8° |
| 2041-01-29 Tue | 1 | — | unknown | — | 71.1° 11:45 | 10.84 | 8% | 53.7° |
| 2041-01-30 Wed | 1 | — | unknown | — | 71.1° 11:40 | 10.81 | 3% | 48.8° |
| 2041-01-31 Thu | 1 | — | unknown | — | 71.1° 11:35 | 10.78 | 0% | 47.1° |
| 2041-02-01 Fri | 1 | — | unknown | — | 71.1° 11:30 | 10.75 | 1% | 49.1° |
| 2041-02-02 Sat | 1 | — | unknown | 06:25–06:30 (marginal, 0.08 h) | 71.1° 11:30 | 10.71 | 5% | 54.3° |
| 2041-02-03 Sun | 2 | — | unknown | 06:25–06:30 (marginal, 0.08 h) | 71.1° 11:25 | 10.68 | 11% | 61.7° |
| 2041-02-04 Mon | 3 | — | unknown | 06:20–06:30 (marginal, 0.17 h) | 71.1° 11:20 | 10.64 | 19% | 70.4° |
| 2041-02-05 Tue | 3 | — | unknown | 06:15–06:30 (marginal, 0.25 h) | 71.1° 11:15 | 10.61 | 29% | 79.5° |
| 2041-02-06 Wed | 3 | — | unknown | 06:10–06:25 (marginal, 0.25 h) | 71.1° 11:10 | 10.57 | 39% | 88.7° |
| 2041-02-07 Thu | 4 | — | unknown | 05:40–05:55 (marginal, 0.25 h) | 71.1° 11:10 | 10.54 | 50% | 97.6° |
| 2041-02-08 Fri | 4 | — | unknown | 05:35–05:50 (marginal, 0.25 h) | 71.1° 11:05 | 10.5 | 60% | 106.1° |
| 2041-02-09 Sat | 5 | — | unknown | 05:30–05:50 (marginal, 0.33 h) | 71.1° 11:00 | 10.46 | 69% | 113.9° |
| 2041-02-10 Sun | 6 | — | unknown | 05:55–06:25 (marginal, 0.5 h) | 71.1° 10:55 | 10.43 | 78% | 120.8° |
| 2041-02-11 Mon | 7 | — | unknown | 05:25–06:20 (marginal, 0.92 h) | 71.1° 10:50 | 10.39 | 85% | 126.4° |
| 2041-02-12 Tue | 7 | — | unknown | 05:20–05:50 (marginal, 0.5 h) | 71.1° 10:50 | 10.35 | 91% | 130.5° |
| 2041-02-13 Wed | 7 | — | unknown | 05:15–05:45 (marginal, 0.5 h) | 71.1° 10:45 | 10.31 | 96% | 132.7° |
| 2041-02-14 Thu | 7 | — | unknown | 05:10–05:45 (marginal, 0.58 h) | 71.1° 10:40 | 10.27 | 99% | 132.6° |
| 2041-02-15 Fri | 8 | — | unknown | 05:10–06:15 (marginal, 1.08 h) | 71.1° 10:35 | 10.23 | 100% | 130.3° |
| 2041-02-16 Sat | 9 | — | unknown | 05:40–05:45 (good, 0.08 h) | 71.1° 10:35 | 10.19 | 99% | 126.2° |
| 2041-02-17 Sun | 9 | — | unknown | 05:00–06:15 (marginal, 1.25 h) | 71.1° 10:30 | 10.15 | 97% | 120.5° |
| 2041-02-18 Mon | 9 | — | unknown | 04:55–06:10 (marginal, 1.25 h) | 71.1° 10:25 | 10.11 | 93% | 113.7° |
| 2041-02-19 Tue | 9 | — | unknown | 05:35–05:40 (good, 0.08 h) | 71.1° 10:20 | 10.07 | 87% | 106.0° |
| 2041-02-20 Wed | 9 | — | unknown | 05:35–05:40 (good, 0.08 h) | 71.1° 10:15 | 10.03 | 80% | 97.9° |
| 2041-02-21 Thu | 9 | — | unknown | 04:45–06:10 (marginal, 1.42 h) | 71.1° 10:15 | 9.98 | 71% | 89.4° |
| 2041-02-22 Fri | 10 | — | unknown | 05:30–05:35 (good, 0.08 h) | 71.1° 10:10 | 9.94 | 61% | 80.7° |
| 2041-02-23 Sat | 12 | — | unknown | 05:20–05:35 (good, 0.25 h) | 71.1° 10:05 | 9.9 | 51% | 72.1° |
| 2041-02-24 Sun | 13 | — | unknown | 05:15–05:30 (good, 0.25 h) | 71.1° 10:00 | 9.85 | 40% | 63.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-01-26&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.