← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-05-13 Sun | 0 | — | unknown | — | 79.2° 11:25 | 5.65 | 7% | 53.5° |
| 2040-05-14 Mon | 0 | — | unknown | — | 79.2° 11:20 | 5.6 | 13% | 64.2° |
| 2040-05-15 Tue | 0 | — | unknown | — | 79.2° 11:20 | 5.55 | 20% | 75.1° |
| 2040-05-16 Wed | 0 | — | unknown | — | 79.2° 11:15 | 5.49 | 28% | 86.0° |
| 2040-05-17 Thu | 0 | — | unknown | — | 79.2° 11:10 | 5.44 | 37% | 97.0° |
| 2040-05-18 Fri | 0 | — | unknown | — | 79.2° 11:05 | 5.39 | 46% | 108.1° |
| 2040-05-19 Sat | 0 | — | unknown | — | 79.2° 11:05 | 5.34 | 56% | 119.2° |
| 2040-05-20 Sun | 0 | — | unknown | — | 79.2° 11:00 | 5.29 | 66% | 130.3° |
| 2040-05-21 Mon | 0 | — | unknown | — | 79.2° 10:55 | 5.24 | 75% | 141.1° |
| 2040-05-22 Tue | 0 | — | unknown | — | 79.2° 10:50 | 5.19 | 84% | 150.8° |
| 2040-05-23 Wed | 0 | — | unknown | — | 79.2° 10:45 | 5.15 | 91% | 157.2° |
| 2040-05-24 Thu | 0 | — | unknown | — | 79.2° 10:45 | 5.1 | 97% | 156.7° |
| 2040-05-25 Fri | 0 | — | unknown | — | 79.2° 10:40 | 5.05 | 100% | 148.9° |
| 2040-05-26 Sat | 0 | — | unknown | — | 79.2° 10:35 | 5.01 | 100% | 137.5° |
| 2040-05-27 Sun | 0 | — | unknown | — | 79.2° 10:30 | 4.97 | 97% | 124.5° |
| 2040-05-28 Mon | 0 | — | unknown | — | 79.2° 10:25 | 4.93 | 91% | 111.0° |
| 2040-05-29 Tue | 0 | — | unknown | — | 79.2° 10:25 | 4.89 | 84% | 97.4° |
| 2040-05-30 Wed | 0 | — | unknown | — | 79.2° 10:20 | 4.85 | 74% | 83.9° |
| 2040-05-31 Thu | 0 | — | unknown | — | 79.2° 10:15 | 4.81 | 63% | 70.7° |
| 2040-06-01 Fri | 1 | — | unknown | — | 79.2° 10:10 | 4.77 | 52% | 58.0° |
| 2040-06-02 Sat | 1 | — | unknown | — | 79.2° 10:10 | 4.74 | 41% | 46.0° |
| 2040-06-03 Sun | 1 | — | unknown | — | 79.2° 10:05 | 4.71 | 31% | 35.2° |
| 2040-06-04 Mon | 1 | — | unknown | — | 79.2° 10:00 | 4.67 | 21% | 26.5° |
| 2040-06-05 Tue | 2 | — | unknown | — | 79.2° 09:55 | 4.64 | 14% | 22.1° |
| 2040-06-06 Wed | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.2° 09:50 | 4.62 | 8% | 24.1° |
| 2040-06-07 Thu | 2 | — | unknown | 04:20–04:30 (marginal, 0.17 h) | 79.2° 09:50 | 4.59 | 3% | 31.0° |
| 2040-06-08 Fri | 2 | — | unknown | 04:15–04:30 (marginal, 0.25 h) | 79.2° 09:45 | 4.57 | 1% | 40.3° |
| 2040-06-09 Sat | 3 | — | unknown | 04:15–04:30 (marginal, 0.25 h) | 79.2° 09:40 | 4.54 | 0% | 50.6° |
| 2040-06-10 Sun | 3 | — | unknown | 04:10–04:30 (marginal, 0.33 h) | 79.2° 09:35 | 4.52 | 1% | 61.2° |
| 2040-06-11 Mon | 4 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.2° 09:30 | 4.5 | 4% | 72.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-05-13&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.