← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-04-16 Thu | 0 | 72 | 0 | — | 89.5° 12:25 | 7.24 | 0% | 31.0° |
| 2026-04-17 Fri | 0 | 77 | 0 | — | 89.6° 12:25 | 7.18 | 0% | 29.6° |
| 2026-04-18 Sat | 0 | 97 | 0 | — | 89.7° 12:20 | 7.12 | 3% | 34.6° |
| 2026-04-19 Sun | 0 | 54 | 0 | — | 89.7° 12:15 | 7.06 | 9% | 43.7° |
| 2026-04-20 Mon | 0 | 36 | 0 | — | 89.6° 12:10 | 7.0 | 16% | 54.9° |
| 2026-04-21 Tue | 0 | 0 | 0 | — | 89.5° 12:05 | 6.95 | 26% | 67.0° |
| 2026-04-22 Wed | 0 | 0 | 0 | — | 89.7° 12:00 | 6.89 | 37% | 79.2° |
| 2026-04-23 Thu | 0 | 0 | 0 | — | 89.7° 12:00 | 6.83 | 48% | 91.4° |
| 2026-04-24 Fri | 0 | 100 | 0 | — | 89.6° 11:50 | 6.77 | 59% | 103.3° |
| 2026-04-25 Sat | 1 | 100 | 1 | — | 89.5° 11:50 | 6.71 | 69% | 114.7° |
| 2026-04-26 Sun | 1 | 100 | 1 | — | 89.6° 11:45 | 6.65 | 78% | 125.5° |
| 2026-04-27 Mon | 1 | 31 | 0 | — | 89.7° 11:40 | 6.6 | 86% | 135.3° |
| 2026-04-28 Tue | 1 | 96 | 1 | — | 89.7° 11:35 | 6.54 | 92% | 143.5° |
| 2026-04-29 Wed | 1 | 0 | 0 | — | 89.5° 11:30 | 6.48 | 97% | 149.0° |
| 2026-04-30 Thu | 1 | 0 | 0 | — | 89.5° 11:30 | 6.42 | 99% | 150.5° |
| 2026-05-01 Fri | 1 | 39 | 0 | — | 89.7° 11:25 | 6.36 | 100% | 147.7° |
| 2026-05-02 Sat | 1 | 0 | 0 | — | 89.7° 11:20 | 6.31 | 98% | 141.5° |
| 2026-05-03 Sun | 1 | 100 | 1 | — | 89.6° 11:15 | 6.25 | 95% | 133.3° |
| 2026-05-04 Mon | 1 | 88 | 1 | — | 89.5° 11:10 | 6.19 | 91% | 124.1° |
| 2026-05-05 Tue | 1 | 100 | 1 | — | 89.6° 11:10 | 6.13 | 84% | 114.3° |
| 2026-05-06 Wed | 1 | 94 | 1 | — | 89.7° 11:05 | 6.08 | 77% | 104.2° |
| 2026-05-07 Thu | 1 | 0 | 0 | — | 89.7° 11:00 | 6.02 | 69% | 93.9° |
| 2026-05-08 Fri | 1 | 25 | 0 | — | 89.6° 10:55 | 5.96 | 59% | 83.3° |
| 2026-05-09 Sat | 2 | 35 | 1 | — | 89.5° 10:55 | 5.91 | 50% | 72.6° |
| 2026-05-10 Sun | 2 | 56 | 1 | — | 89.6° 10:50 | 5.85 | 40% | 61.9° |
| 2026-05-11 Mon | 3 | 0 | 0 | — | 89.7° 10:45 | 5.79 | 30% | 51.3° |
| 2026-05-12 Tue | 3 | 100 | 3 | 04:45–04:55 (marginal, 0.17 h) | 89.7° 10:40 | 5.74 | 20% | 41.4° |
| 2026-05-13 Wed | 4 | 0 | 0 | — | 89.5° 10:35 | 5.68 | 12% | 33.3° |
| 2026-05-14 Thu | 5 | 5 | 0 | — | 89.5° 10:35 | 5.63 | 5% | 29.4° |
| 2026-05-15 Fri | 5 | 10 | 1 | — | 89.7° 10:30 | 5.58 | 1% | 31.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-04-16&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.