← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-06-21 Sat | 0 | — | unknown | — | 72.5° 11:05 | 4.42 | 18% | 81.1° |
| 2042-06-22 Sun | 0 | — | unknown | — | 72.5° 11:05 | 4.42 | 26% | 93.5° |
| 2042-06-23 Mon | 0 | — | unknown | — | 72.5° 11:00 | 4.43 | 36% | 105.6° |
| 2042-06-24 Tue | 0 | — | unknown | — | 72.5° 10:55 | 4.44 | 45% | 117.5° |
| 2042-06-25 Wed | 0 | — | unknown | — | 72.5° 10:50 | 4.44 | 54% | 129.4° |
| 2042-06-26 Thu | 0 | — | unknown | — | 72.5° 10:50 | 4.46 | 64% | 141.3° |
| 2042-06-27 Fri | 0 | — | unknown | — | 72.5° 10:45 | 4.47 | 72% | 153.2° |
| 2042-06-28 Sat | 0 | — | unknown | — | 72.5° 10:40 | 4.48 | 81% | 165.3° |
| 2042-06-29 Sun | 0 | — | unknown | — | 72.5° 10:35 | 4.5 | 88% | 177.4° |
| 2042-06-30 Mon | 0 | — | unknown | — | 72.5° 10:30 | 4.52 | 94% | 169.7° |
| 2042-07-01 Tue | 0 | — | unknown | — | 72.5° 10:30 | 4.54 | 98% | 156.9° |
| 2042-07-02 Wed | 0 | — | unknown | — | 72.5° 10:25 | 4.56 | 100% | 143.8° |
| 2042-07-03 Thu | 0 | — | unknown | — | 72.5° 10:20 | 4.59 | 99% | 130.3° |
| 2042-07-04 Fri | 0 | — | unknown | — | 72.5° 10:15 | 4.61 | 97% | 116.6° |
| 2042-07-05 Sat | 0 | — | unknown | — | 72.5° 10:10 | 4.64 | 92% | 102.7° |
| 2042-07-06 Sun | 0 | — | unknown | — | 72.5° 10:10 | 4.67 | 84% | 88.7° |
| 2042-07-07 Mon | 0 | — | unknown | — | 72.5° 10:05 | 4.7 | 75% | 74.5° |
| 2042-07-08 Tue | 0 | — | unknown | — | 72.5° 10:00 | 4.73 | 65% | 60.3° |
| 2042-07-09 Wed | 0 | — | unknown | — | 72.5° 09:55 | 4.77 | 54% | 46.1° |
| 2042-07-10 Thu | 1 | — | unknown | — | 72.5° 09:55 | 4.8 | 42% | 31.9° |
| 2042-07-11 Fri | 1 | — | unknown | — | 72.5° 09:50 | 4.84 | 31% | 17.8° |
| 2042-07-12 Sat | 1 | — | unknown | — | 72.6° 09:45 | 4.88 | 21% | 3.9° |
| 2042-07-13 Sun | 2 | — | unknown | 04:40–04:45 (marginal, 0.08 h) | 72.5° 09:40 | 4.92 | 13% | 10.2° |
| 2042-07-14 Mon | 2 | — | unknown | 04:35–04:45 (marginal, 0.17 h) | 72.5° 09:35 | 4.96 | 6% | 23.9° |
| 2042-07-15 Tue | 3 | — | unknown | 04:25–04:50 (marginal, 0.42 h) | 72.5° 09:35 | 5.0 | 2% | 37.5° |
| 2042-07-16 Wed | 4 | — | unknown | 04:25–04:50 (marginal, 0.42 h) | 72.5° 09:30 | 5.05 | 0% | 50.8° |
| 2042-07-17 Thu | 5 | — | unknown | 04:20–04:50 (marginal, 0.5 h) | 72.6° 09:25 | 5.09 | 1% | 63.9° |
| 2042-07-18 Fri | 6 | — | unknown | 04:15–04:50 (marginal, 0.58 h) | 72.5° 09:20 | 5.14 | 3% | 76.7° |
| 2042-07-19 Sat | 7 | — | unknown | 04:10–04:55 (marginal, 0.75 h) | 72.5° 09:15 | 5.18 | 8% | 89.2° |
| 2042-07-20 Sun | 8 | — | unknown | 03:40–04:55 (marginal, 1.25 h) | 72.5° 09:15 | 5.23 | 14% | 101.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-06-21&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.