← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-01-22 Sun | 0 | — | unknown | — | 71.1° 12:20 | 11.07 | 68% | 101.7° |
| 2040-01-23 Mon | 0 | — | unknown | — | 71.1° 12:15 | 11.04 | 76% | 109.6° |
| 2040-01-24 Tue | 0 | — | unknown | — | 71.1° 12:10 | 11.01 | 84% | 116.8° |
| 2040-01-25 Wed | 0 | — | unknown | — | 71.1° 12:05 | 10.98 | 90% | 123.3° |
| 2040-01-26 Thu | 0 | — | unknown | — | 71.1° 12:00 | 10.96 | 95% | 128.5° |
| 2040-01-27 Fri | 0 | — | unknown | — | 71.1° 11:55 | 10.93 | 98% | 132.1° |
| 2040-01-28 Sat | 1 | — | unknown | — | 71.1° 11:50 | 10.9 | 100% | 133.6° |
| 2040-01-29 Sun | 1 | — | unknown | — | 71.1° 11:45 | 10.87 | 100% | 132.7° |
| 2040-01-30 Mon | 1 | — | unknown | — | 71.1° 11:45 | 10.83 | 97% | 129.5° |
| 2040-01-31 Tue | 1 | — | unknown | — | 71.1° 11:40 | 10.8 | 93% | 124.3° |
| 2040-02-01 Wed | 1 | — | unknown | — | 71.1° 11:35 | 10.77 | 88% | 117.6° |
| 2040-02-02 Thu | 1 | — | unknown | — | 71.1° 11:30 | 10.74 | 80% | 109.7° |
| 2040-02-03 Fri | 1 | — | unknown | — | 71.1° 11:25 | 10.7 | 71% | 101.1° |
| 2040-02-04 Sat | 1 | — | unknown | — | 71.1° 11:25 | 10.67 | 61% | 92.1° |
| 2040-02-05 Sun | 2 | — | unknown | 05:50–05:55 (marginal, 0.08 h) | 71.1° 11:20 | 10.64 | 50% | 82.7° |
| 2040-02-06 Mon | 3 | — | unknown | 05:45–05:55 (marginal, 0.17 h) | 71.1° 11:15 | 10.6 | 39% | 73.4° |
| 2040-02-07 Tue | 3 | — | unknown | 05:45–05:55 (marginal, 0.17 h) | 71.1° 11:10 | 10.56 | 28% | 64.5° |
| 2040-02-08 Wed | 4 | — | unknown | 05:40–05:55 (marginal, 0.25 h) | 71.1° 11:05 | 10.53 | 18% | 56.5° |
| 2040-02-09 Thu | 4 | — | unknown | 06:00–06:25 (marginal, 0.42 h) | 71.1° 11:05 | 10.49 | 10% | 50.3° |
| 2040-02-10 Fri | 5 | — | unknown | 05:30–05:50 (marginal, 0.33 h) | 71.1° 11:00 | 10.45 | 4% | 46.8° |
| 2040-02-11 Sat | 6 | — | unknown | 05:25–05:50 (marginal, 0.42 h) | 71.1° 10:55 | 10.42 | 1% | 46.9° |
| 2040-02-12 Sun | 7 | — | unknown | 05:25–06:20 (marginal, 0.92 h) | 71.1° 10:50 | 10.38 | 0% | 50.4° |
| 2040-02-13 Mon | 8 | — | unknown | 05:45–05:50 (good, 0.08 h) | 71.1° 10:45 | 10.34 | 3% | 56.5° |
| 2040-02-14 Tue | 8 | — | unknown | 05:40–05:45 (good, 0.08 h) | 71.1° 10:45 | 10.3 | 7% | 64.2° |
| 2040-02-15 Wed | 9 | — | unknown | 05:40–05:45 (good, 0.08 h) | 71.1° 10:40 | 10.26 | 14% | 72.8° |
| 2040-02-16 Thu | 10 | — | unknown | 05:35–05:45 (good, 0.17 h) | 71.1° 10:35 | 10.22 | 22% | 81.6° |
| 2040-02-17 Fri | 11 | — | unknown | 05:30–05:45 (good, 0.25 h) | 71.1° 10:30 | 10.18 | 31% | 90.4° |
| 2040-02-18 Sat | 11 | — | unknown | 05:25–05:40 (good, 0.25 h) | 71.1° 10:30 | 10.14 | 41% | 98.9° |
| 2040-02-19 Sun | 12 | — | unknown | 05:25–05:40 (good, 0.25 h) | 71.1° 10:25 | 10.1 | 50% | 107.0° |
| 2040-02-20 Mon | 14 | — | unknown | 05:20–05:40 (good, 0.33 h) | 71.1° 10:20 | 10.06 | 60% | 114.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-01-22&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.