← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-04-21 Sun | 34 | — | unknown | 02:45–04:50 (good, 2.08 h) | 71.1° 07:20 | 6.92 | 70% | 53.8° |
| 2041-04-22 Mon | 47 | — | unknown | 02:15–04:50 (good, 2.58 h) | 71.1° 07:15 | 6.87 | 59% | 49.3° |
| 2041-04-23 Tue | 56 | — | unknown | 02:10–04:45 (good, 2.58 h) | 71.1° 07:15 | 6.81 | 48% | 47.4° |
| 2041-04-24 Wed | 63 | — | unknown | 02:10–04:45 (good, 2.58 h) | 71.1° 07:10 | 6.75 | 36% | 48.7° |
| 2041-04-25 Thu | 68 | — | unknown | 02:05–04:40 (good, 2.58 h) | 71.1° 07:05 | 6.69 | 26% | 53.0° |
| 2041-04-26 Fri | 69 | — | unknown | 02:00–04:40 (good, 2.67 h) | 71.1° 07:00 | 6.63 | 16% | 59.6° |
| 2041-04-27 Sat | 72 | — | unknown | 01:55–04:40 (good, 2.75 h) | 71.1° 07:00 | 6.57 | 8% | 67.8° |
| 2041-04-28 Sun | 72 | — | unknown | 01:50–04:35 (good, 2.75 h) | 71.1° 06:55 | 6.52 | 3% | 76.8° |
| 2041-04-29 Mon | 73 | — | unknown | 01:50–04:35 (good, 2.75 h) | 71.1° 06:50 | 6.46 | 0% | 86.3° |
| 2041-04-30 Tue | 74 | — | unknown | 01:45–04:30 (good, 2.75 h) | 71.1° 06:45 | 6.4 | 0% | 95.7° |
| 2041-05-01 Wed | 75 | — | unknown | 01:40–04:30 (good, 2.83 h) | 71.1° 06:40 | 6.34 | 2% | 104.7° |
| 2041-05-02 Thu | 76 | — | unknown | 01:35–04:30 (good, 2.92 h) | 71.1° 06:40 | 6.28 | 7% | 113.0° |
| 2041-05-03 Fri | 77 | — | unknown | 01:35–04:25 (good, 2.83 h) | 71.1° 06:35 | 6.23 | 13% | 120.3° |
| 2041-05-04 Sat | 78 | — | unknown | 01:30–04:25 (good, 2.92 h) | 71.1° 06:30 | 6.17 | 21% | 126.2° |
| 2041-05-05 Sun | 80 | — | unknown | 01:25–04:25 (good, 3.0 h) | 71.1° 06:25 | 6.11 | 29% | 130.3° |
| 2041-05-06 Mon | 79 | — | unknown | 01:25–04:20 (good, 2.92 h) | 71.1° 06:20 | 6.05 | 38% | 132.4° |
| 2041-05-07 Tue | 80 | — | unknown | 01:20–04:20 (good, 3.0 h) | 71.1° 06:20 | 6.0 | 48% | 132.2° |
| 2041-05-08 Wed | 81 | — | unknown | 01:20–04:20 (good, 3.0 h) | 71.1° 06:15 | 5.94 | 57% | 129.8° |
| 2041-05-09 Thu | 80 | — | unknown | 01:15–04:15 (good, 3.0 h) | 71.1° 06:10 | 5.89 | 66% | 125.6° |
| 2041-05-10 Fri | 80 | — | unknown | 01:15–04:15 (good, 3.0 h) | 71.1° 06:05 | 5.83 | 75% | 119.8° |
| 2041-05-11 Sat | 71 | — | unknown | 01:15–04:15 (good, 3.0 h) | 71.1° 06:00 | 5.77 | 83% | 112.9° |
| 2041-05-12 Sun | 64 | — | unknown | 01:15–04:10 (good, 2.92 h) | 71.1° 06:00 | 5.72 | 90% | 105.2° |
| 2041-05-13 Mon | 58 | — | unknown | 01:20–04:10 (good, 2.83 h) | 71.1° 05:55 | 5.67 | 95% | 96.9° |
| 2041-05-14 Tue | 51 | — | unknown | 01:50–04:10 (good, 2.33 h) | 71.1° 05:50 | 5.61 | 99% | 88.1° |
| 2041-05-15 Wed | 44 | — | unknown | 02:20–04:05 (good, 1.75 h) | 71.1° 05:45 | 5.56 | 100% | 79.2° |
| 2041-05-16 Thu | 40 | — | unknown | 02:50–04:05 (good, 1.25 h) | 71.1° 05:45 | 5.51 | 99% | 70.5° |
| 2041-05-17 Fri | 38 | — | unknown | 03:10–04:05 (good, 0.92 h) | 71.1° 05:40 | 5.45 | 96% | 62.3° |
| 2041-05-18 Sat | 38 | — | unknown | 03:00–04:00 (good, 1.0 h) | 71.1° 05:35 | 5.4 | 90% | 55.3° |
| 2041-05-19 Sun | 50 | — | unknown | 01:45–04:00 (good, 2.25 h) | 71.1° 05:30 | 5.35 | 82% | 50.1° |
| 2041-05-20 Mon | 66 | — | unknown | 00:25–04:00 (good, 3.58 h) | 71.1° 05:25 | 5.3 | 72% | 47.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-04-21&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.