← 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. |
|---|---|---|---|---|---|---|---|---|
| 2028-04-18 Tue | 0 | — | unknown | — | 89.5° 12:15 | 7.09 | 29% | 67.3° |
| 2028-04-19 Wed | 0 | — | unknown | — | 89.6° 12:15 | 7.03 | 21% | 57.3° |
| 2028-04-20 Thu | 0 | — | unknown | — | 89.7° 12:10 | 6.97 | 14% | 47.8° |
| 2028-04-21 Fri | 0 | — | unknown | — | 89.7° 12:05 | 6.92 | 8% | 39.2° |
| 2028-04-22 Sat | 0 | — | unknown | — | 89.6° 12:00 | 6.86 | 4% | 32.3° |
| 2028-04-23 Sun | 0 | — | unknown | — | 89.6° 11:55 | 6.8 | 1% | 28.6° |
| 2028-04-24 Mon | 0 | — | unknown | — | 89.7° 11:50 | 6.74 | 0% | 29.5° |
| 2028-04-25 Tue | 0 | — | unknown | — | 89.7° 11:45 | 6.68 | 1% | 35.0° |
| 2028-04-26 Wed | 1 | — | unknown | — | 89.6° 11:40 | 6.62 | 5% | 43.4° |
| 2028-04-27 Thu | 1 | — | unknown | — | 89.5° 11:40 | 6.57 | 10% | 53.5° |
| 2028-04-28 Fri | 1 | — | unknown | — | 89.7° 11:35 | 6.51 | 18% | 64.6° |
| 2028-04-29 Sat | 1 | — | unknown | — | 89.7° 11:30 | 6.45 | 27% | 76.3° |
| 2028-04-30 Sun | 1 | — | unknown | — | 89.7° 11:25 | 6.39 | 37% | 88.4° |
| 2028-05-01 Mon | 1 | — | unknown | — | 89.5° 11:20 | 6.33 | 48% | 100.6° |
| 2028-05-02 Tue | 1 | — | unknown | — | 89.6° 11:20 | 6.28 | 59% | 112.9° |
| 2028-05-03 Wed | 1 | — | unknown | — | 89.7° 11:15 | 6.22 | 70% | 124.9° |
| 2028-05-04 Thu | 1 | — | unknown | — | 89.7° 11:10 | 6.16 | 80% | 136.1° |
| 2028-05-05 Fri | 2 | — | unknown | — | 89.6° 11:05 | 6.1 | 89% | 145.5° |
| 2028-05-06 Sat | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.5° 11:05 | 6.05 | 95% | 151.1° |
| 2028-05-07 Sun | 2 | — | unknown | — | 89.6° 11:00 | 5.99 | 99% | 150.6° |
| 2028-05-08 Mon | 2 | — | unknown | — | 89.7° 10:55 | 5.93 | 100% | 144.5° |
| 2028-05-09 Tue | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.7° 10:50 | 5.88 | 98% | 135.3° |
| 2028-05-10 Wed | 3 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.6° 10:45 | 5.82 | 95% | 124.7° |
| 2028-05-11 Thu | 3 | — | unknown | 04:05–04:15 (marginal, 0.17 h) | 89.5° 10:45 | 5.77 | 89% | 113.7° |
| 2028-05-12 Fri | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.7° 10:40 | 5.71 | 82% | 102.6° |
| 2028-05-13 Sat | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.7° 10:35 | 5.66 | 73% | 91.6° |
| 2028-05-14 Sun | 3 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.7° 10:30 | 5.6 | 64% | 80.9° |
| 2028-05-15 Mon | 3 | — | unknown | 03:50–04:05 (marginal, 0.25 h) | 89.5° 10:25 | 5.55 | 55% | 70.5° |
| 2028-05-16 Tue | 4 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.6° 10:25 | 5.5 | 46% | 60.3° |
| 2028-05-17 Wed | 5 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.7° 10:20 | 5.45 | 36% | 50.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2028-04-18&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.