← 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. |
|---|---|---|---|---|---|---|---|---|
| 2046-05-17 Thu | 0 | — | unknown | — | 79.2° 11:15 | 5.46 | 93% | 164.5° |
| 2046-05-18 Fri | 0 | — | unknown | — | 79.2° 11:10 | 5.41 | 98% | 163.3° |
| 2046-05-19 Sat | 0 | — | unknown | — | 79.2° 11:05 | 5.36 | 100% | 153.1° |
| 2046-05-20 Sun | 0 | — | unknown | — | 79.2° 11:00 | 5.31 | 99% | 140.7° |
| 2046-05-21 Mon | 0 | — | unknown | — | 79.2° 10:55 | 5.26 | 96% | 127.8° |
| 2046-05-22 Tue | 0 | — | unknown | — | 79.2° 10:55 | 5.21 | 91% | 115.1° |
| 2046-05-23 Wed | 0 | — | unknown | — | 79.2° 10:50 | 5.17 | 84% | 102.6° |
| 2046-05-24 Thu | 0 | — | unknown | — | 79.2° 10:45 | 5.12 | 76% | 90.4° |
| 2046-05-25 Fri | 0 | — | unknown | — | 79.2° 10:40 | 5.07 | 67% | 78.4° |
| 2046-05-26 Sat | 0 | — | unknown | — | 79.2° 10:35 | 5.03 | 57% | 66.8° |
| 2046-05-27 Sun | 0 | — | unknown | — | 79.2° 10:35 | 4.99 | 48% | 55.3° |
| 2046-05-28 Mon | 0 | — | unknown | — | 79.2° 10:30 | 4.94 | 39% | 44.1° |
| 2046-05-29 Tue | 0 | — | unknown | — | 79.2° 10:25 | 4.9 | 30% | 33.3° |
| 2046-05-30 Wed | 0 | — | unknown | — | 79.2° 10:20 | 4.86 | 21% | 23.2° |
| 2046-05-31 Thu | 1 | — | unknown | — | 79.2° 10:20 | 4.83 | 14% | 15.6° |
| 2046-06-01 Fri | 1 | — | unknown | — | 79.2° 10:15 | 4.79 | 8% | 15.5° |
| 2046-06-02 Sat | 1 | — | unknown | — | 79.2° 10:10 | 4.75 | 3% | 23.3° |
| 2046-06-03 Sun | 1 | — | unknown | — | 79.2° 10:05 | 4.72 | 1% | 34.2° |
| 2046-06-04 Mon | 1 | — | unknown | — | 79.2° 10:00 | 4.69 | 0% | 46.4° |
| 2046-06-05 Tue | 2 | — | unknown | 04:30–04:35 (marginal, 0.08 h) | 79.2° 10:00 | 4.66 | 2% | 59.1° |
| 2046-06-06 Wed | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.2° 09:55 | 4.63 | 6% | 72.2° |
| 2046-06-07 Thu | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.2° 09:50 | 4.6 | 12% | 85.6° |
| 2046-06-08 Fri | 2 | — | unknown | 04:20–04:30 (marginal, 0.17 h) | 79.2° 09:45 | 4.58 | 21% | 99.1° |
| 2046-06-09 Sat | 3 | — | unknown | 04:15–04:30 (marginal, 0.25 h) | 79.2° 09:40 | 4.55 | 31% | 112.7° |
| 2046-06-10 Sun | 3 | — | unknown | 04:10–04:30 (marginal, 0.33 h) | 79.2° 09:40 | 4.53 | 42% | 126.3° |
| 2046-06-11 Mon | 3 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.2° 09:35 | 4.51 | 53% | 139.6° |
| 2046-06-12 Tue | 4 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.2° 09:30 | 4.49 | 65% | 152.3° |
| 2046-06-13 Wed | 5 | — | unknown | 04:00–04:30 (marginal, 0.5 h) | 79.2° 09:25 | 4.48 | 75% | 162.8° |
| 2046-06-14 Thu | 6 | — | unknown | 03:55–04:30 (marginal, 0.58 h) | 79.2° 09:25 | 4.46 | 84% | 165.2° |
| 2046-06-15 Fri | 7 | — | unknown | 03:50–04:30 (marginal, 0.67 h) | 79.2° 09:20 | 4.45 | 92% | 157.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-05-17&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.