← 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. |
|---|---|---|---|---|---|---|---|---|
| 2039-05-21 Sat | 0 | — | unknown | — | 79.2° 11:00 | 5.28 | 1% | 26.8° |
| 2039-05-22 Sun | 0 | — | unknown | — | 79.2° 10:55 | 5.23 | 0% | 34.0° |
| 2039-05-23 Mon | 0 | — | unknown | — | 79.2° 10:50 | 5.18 | 1% | 43.1° |
| 2039-05-24 Tue | 0 | — | unknown | — | 79.2° 10:45 | 5.13 | 3% | 53.1° |
| 2039-05-25 Wed | 0 | — | unknown | — | 79.2° 10:40 | 5.09 | 7% | 63.6° |
| 2039-05-26 Thu | 0 | — | unknown | — | 79.2° 10:40 | 5.04 | 13% | 74.4° |
| 2039-05-27 Fri | 0 | — | unknown | — | 79.2° 10:35 | 5.0 | 20% | 85.5° |
| 2039-05-28 Sat | 0 | — | unknown | — | 79.2° 10:30 | 4.96 | 28% | 96.8° |
| 2039-05-29 Sun | 0 | — | unknown | — | 79.2° 10:25 | 4.92 | 38% | 108.2° |
| 2039-05-30 Mon | 1 | — | unknown | — | 79.2° 10:20 | 4.88 | 48% | 119.8° |
| 2039-05-31 Tue | 1 | — | unknown | — | 79.2° 10:20 | 4.84 | 59% | 131.3° |
| 2039-06-01 Wed | 1 | — | unknown | — | 79.2° 10:15 | 4.8 | 69% | 142.4° |
| 2039-06-02 Thu | 1 | — | unknown | — | 79.2° 10:10 | 4.77 | 79% | 151.8° |
| 2039-06-03 Fri | 1 | — | unknown | — | 79.2° 10:05 | 4.73 | 88% | 156.6° |
| 2039-06-04 Sat | 1 | — | unknown | — | 79.2° 10:05 | 4.7 | 95% | 153.4° |
| 2039-06-05 Sun | 1 | — | unknown | — | 79.2° 10:00 | 4.67 | 99% | 144.0° |
| 2039-06-06 Mon | 1 | — | unknown | — | 79.2° 09:55 | 4.64 | 100% | 131.7° |
| 2039-06-07 Tue | 1 | — | unknown | — | 79.2° 09:50 | 4.61 | 98% | 118.5° |
| 2039-06-08 Wed | 1 | — | unknown | — | 79.2° 09:45 | 4.58 | 93% | 105.0° |
| 2039-06-09 Thu | 2 | — | unknown | — | 79.2° 09:45 | 4.56 | 86% | 91.6° |
| 2039-06-10 Fri | 2 | — | unknown | — | 79.2° 09:40 | 4.54 | 77% | 78.6° |
| 2039-06-11 Sat | 2 | — | unknown | — | 79.2° 09:35 | 4.52 | 67% | 66.2° |
| 2039-06-12 Sun | 2 | — | unknown | 03:35–03:40 (marginal, 0.08 h) | 79.2° 09:30 | 4.5 | 57% | 54.5° |
| 2039-06-13 Mon | 3 | — | unknown | 03:30–03:40 (marginal, 0.17 h) | 79.2° 09:25 | 4.48 | 47% | 43.6° |
| 2039-06-14 Tue | 4 | — | unknown | 03:25–03:40 (marginal, 0.25 h) | 79.2° 09:25 | 4.47 | 37% | 34.0° |
| 2039-06-15 Wed | 5 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.2° 09:20 | 4.45 | 28% | 26.6° |
| 2039-06-16 Thu | 6 | — | unknown | 03:55–04:30 (marginal, 0.58 h) | 79.2° 09:15 | 4.44 | 19% | 23.3° |
| 2039-06-17 Fri | 8 | — | unknown | 03:45–04:30 (marginal, 0.75 h) | 79.2° 09:10 | 4.44 | 12% | 25.5° |
| 2039-06-18 Sat | 9 | — | unknown | 03:10–04:30 (marginal, 1.33 h) | 79.2° 09:10 | 4.43 | 7% | 32.0° |
| 2039-06-19 Sun | 10 | — | unknown | 03:35–03:40 (good, 0.08 h) | 79.2° 09:05 | 4.42 | 3% | 40.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2039-05-21&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.