← 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. |
|---|---|---|---|---|---|---|---|---|
| 2028-05-11 Thu | 0 | — | unknown | — | 79.1° 11:35 | 5.77 | 89% | 121.3° |
| 2028-05-12 Fri | 0 | — | unknown | — | 79.1° 11:30 | 5.71 | 82% | 109.0° |
| 2028-05-13 Sat | 0 | — | unknown | — | 79.1° 11:25 | 5.66 | 73% | 97.0° |
| 2028-05-14 Sun | 0 | — | unknown | — | 79.1° 11:20 | 5.6 | 64% | 85.2° |
| 2028-05-15 Mon | 0 | — | unknown | — | 79.1° 11:20 | 5.55 | 55% | 73.5° |
| 2028-05-16 Tue | 0 | — | unknown | — | 79.1° 11:15 | 5.5 | 46% | 62.1° |
| 2028-05-17 Wed | 0 | — | unknown | — | 79.1° 11:10 | 5.45 | 36% | 50.8° |
| 2028-05-18 Thu | 0 | — | unknown | — | 79.1° 11:05 | 5.39 | 27% | 39.7° |
| 2028-05-19 Fri | 0 | — | unknown | — | 79.1° 11:00 | 5.34 | 19% | 28.9° |
| 2028-05-20 Sat | 0 | — | unknown | — | 79.1° 11:00 | 5.29 | 12% | 19.4° |
| 2028-05-21 Sun | 0 | — | unknown | — | 79.1° 10:55 | 5.24 | 6% | 14.4° |
| 2028-05-22 Mon | 0 | — | unknown | — | 79.1° 10:50 | 5.2 | 2% | 18.6° |
| 2028-05-23 Tue | 0 | — | unknown | — | 79.1° 10:45 | 5.15 | 0% | 28.6° |
| 2028-05-24 Wed | 0 | — | unknown | — | 79.1° 10:45 | 5.1 | 0% | 40.6° |
| 2028-05-25 Thu | 0 | — | unknown | — | 79.1° 10:40 | 5.06 | 3% | 53.3° |
| 2028-05-26 Fri | 0 | — | unknown | — | 79.1° 10:35 | 5.01 | 8% | 66.5° |
| 2028-05-27 Sat | 0 | — | unknown | — | 79.1° 10:30 | 4.97 | 15% | 80.0° |
| 2028-05-28 Sun | 1 | — | unknown | — | 79.1° 10:25 | 4.93 | 24% | 93.6° |
| 2028-05-29 Mon | 1 | — | unknown | — | 79.1° 10:25 | 4.89 | 34% | 107.3° |
| 2028-05-30 Tue | 1 | — | unknown | — | 79.1° 10:20 | 4.85 | 46% | 120.9° |
| 2028-05-31 Wed | 1 | — | unknown | — | 79.1° 10:15 | 4.81 | 57% | 134.4° |
| 2028-06-01 Thu | 1 | — | unknown | — | 79.1° 10:10 | 4.78 | 68% | 147.4° |
| 2028-06-02 Fri | 1 | — | unknown | — | 79.1° 10:05 | 4.74 | 78% | 159.0° |
| 2028-06-03 Sat | 1 | — | unknown | — | 79.1° 10:05 | 4.71 | 87% | 165.6° |
| 2028-06-04 Sun | 2 | — | unknown | 04:30–04:35 (marginal, 0.08 h) | 79.1° 10:00 | 4.68 | 93% | 161.2° |
| 2028-06-05 Mon | 2 | — | unknown | — | 79.1° 09:55 | 4.65 | 98% | 150.5° |
| 2028-06-06 Tue | 2 | — | unknown | — | 79.1° 09:50 | 4.62 | 100% | 138.3° |
| 2028-06-07 Wed | 2 | — | unknown | — | 79.1° 09:50 | 4.59 | 99% | 125.8° |
| 2028-06-08 Thu | 2 | — | unknown | — | 79.1° 09:45 | 4.57 | 97% | 113.4° |
| 2028-06-09 Fri | 2 | — | unknown | — | 79.1° 09:40 | 4.54 | 92% | 101.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2028-05-11&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.