← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-04-09 Tue | 66 | — | unknown | 23:30–04:10 (good, 4.67 h) | 50.1° 00:40 | 7.62 | 64% | 58.4° |
| 2041-04-10 Wed | 56 | — | unknown | 21:40–04:55 (marginal, 7.25 h) | 50.1° 00:35 | 7.56 | 73% | 46.6° |
| 2041-04-11 Thu | 38 | — | unknown | 21:40–04:40 (marginal, 7.0 h) | 50.1° 00:30 | 7.5 | 81% | 34.8° |
| 2041-04-12 Fri | 27 | — | unknown | 21:50–04:30 (marginal, 6.67 h) | 50.1° 00:25 | 7.44 | 88% | 22.9° |
| 2041-04-13 Sat | 22 | — | unknown | 23:40–04:15 (marginal, 4.58 h) | 50.1° 00:25 | 7.39 | 94% | 10.9° |
| 2041-04-14 Sun | 19 | — | unknown | 00:40–04:00 (marginal, 3.33 h) | 50.1° 00:20 | 7.33 | 98% | 2.1° |
| 2041-04-15 Mon | 21 | — | unknown | 21:45–03:45 (marginal, 6.0 h) | 50.1° 00:15 | 7.27 | 100% | 14.0° |
| 2041-04-16 Tue | 26 | — | unknown | 21:45–03:40 (marginal, 5.92 h) | 50.1° 00:10 | 7.21 | 100% | 26.7° |
| 2041-04-17 Wed | 41 | — | unknown | 21:50–03:55 (marginal, 6.08 h) | 50.1° 00:05 | 7.16 | 98% | 39.6° |
| 2041-04-18 Thu | 90 | — | unknown | 21:50–23:50 (good, 2.0 h) | 50.1° 00:05 | 7.1 | 94% | 52.7° |
| 2041-04-19 Fri | 93 | — | unknown | 21:50–02:15 (good, 4.42 h) | 50.1° 00:00 | 7.04 | 88% | 66.0° |
| 2041-04-20 Sat | 93 | — | unknown | 21:55–03:20 (good, 5.42 h) | 50.1° 23:55 | 6.98 | 79% | 79.5° |
| 2041-04-21 Sun | 93 | — | unknown | 21:55–03:30 (good, 5.58 h) | 50.1° 23:50 | 6.92 | 70% | 93.2° |
| 2041-04-22 Mon | 93 | — | unknown | 21:55–03:30 (good, 5.58 h) | 50.1° 23:45 | 6.87 | 59% | 107.1° |
| 2041-04-23 Tue | 93 | — | unknown | 21:55–03:35 (good, 5.67 h) | 50.1° 23:45 | 6.81 | 48% | 121.2° |
| 2041-04-24 Wed | 93 | — | unknown | 22:00–03:30 (good, 5.5 h) | 50.1° 23:40 | 6.75 | 36% | 135.4° |
| 2041-04-25 Thu | 93 | — | unknown | 22:00–03:25 (good, 5.42 h) | 50.1° 23:35 | 6.69 | 26% | 149.7° |
| 2041-04-26 Fri | 93 | — | unknown | 22:00–03:25 (good, 5.42 h) | 50.1° 23:30 | 6.63 | 16% | 164.0° |
| 2041-04-27 Sat | 93 | — | unknown | 22:05–03:20 (good, 5.25 h) | 50.1° 23:25 | 6.57 | 8% | 177.9° |
| 2041-04-28 Sun | 93 | — | unknown | 22:05–03:15 (good, 5.17 h) | 50.1° 23:25 | 6.52 | 3% | 167.1° |
| 2041-04-29 Mon | 93 | — | unknown | 22:05–03:10 (good, 5.08 h) | 50.1° 23:20 | 6.46 | 0% | 153.0° |
| 2041-04-30 Tue | 93 | — | unknown | 22:10–03:05 (good, 4.92 h) | 50.1° 23:15 | 6.4 | 0% | 139.1° |
| 2041-05-01 Wed | 93 | — | unknown | 22:10–03:05 (good, 4.92 h) | 50.1° 23:10 | 6.34 | 2% | 125.5° |
| 2041-05-02 Thu | 93 | — | unknown | 22:10–03:00 (good, 4.83 h) | 50.1° 23:10 | 6.28 | 7% | 112.2° |
| 2041-05-03 Fri | 92 | — | unknown | 22:15–02:55 (good, 4.67 h) | 50.1° 23:05 | 6.23 | 13% | 99.3° |
| 2041-05-04 Sat | 89 | — | unknown | 22:15–02:50 (good, 4.58 h) | 50.1° 23:00 | 6.17 | 21% | 86.7° |
| 2041-05-05 Sun | 84 | — | unknown | 22:15–02:50 (good, 4.58 h) | 50.1° 22:55 | 6.11 | 29% | 74.5° |
| 2041-05-06 Mon | 75 | — | unknown | 22:20–02:45 (good, 4.42 h) | 50.1° 22:50 | 6.05 | 38% | 62.4° |
| 2041-05-07 Tue | 60 | — | unknown | 22:20–02:20 (good, 4.0 h) | 50.1° 22:50 | 6.0 | 48% | 50.5° |
| 2041-05-08 Wed | 45 | — | unknown | 23:25–01:40 (good, 2.25 h) | 50.1° 22:45 | 5.94 | 57% | 38.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-04-09&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.