← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-05-27 Mon | 14 | — | unknown | 03:35–03:50 (good, 0.25 h) | 89.7° 09:40 | 4.98 | 5% | 36.2° |
| 2041-05-28 Tue | 15 | — | unknown | 03:35–03:50 (good, 0.25 h) | 89.5° 09:35 | 4.94 | 1% | 41.4° |
| 2041-05-29 Wed | 16 | — | unknown | 03:30–03:50 (good, 0.33 h) | 89.6° 09:35 | 4.9 | 0% | 49.3° |
| 2041-05-30 Thu | 17 | — | unknown | 03:25–03:45 (good, 0.33 h) | 89.8° 09:30 | 4.86 | 1% | 58.4° |
| 2041-05-31 Fri | 18 | — | unknown | 03:20–03:45 (good, 0.42 h) | 89.8° 09:25 | 4.82 | 4% | 68.2° |
| 2041-06-01 Sat | 19 | — | unknown | 03:20–03:45 (good, 0.42 h) | 89.6° 09:20 | 4.78 | 9% | 78.2° |
| 2041-06-02 Sun | 21 | — | unknown | 03:15–03:45 (good, 0.5 h) | 89.5° 09:20 | 4.75 | 16% | 88.3° |
| 2041-06-03 Mon | 23 | — | unknown | 03:10–03:45 (good, 0.58 h) | 89.7° 09:15 | 4.71 | 23% | 98.1° |
| 2041-06-04 Tue | 23 | — | unknown | 03:05–03:40 (good, 0.58 h) | 89.8° 09:10 | 4.68 | 32% | 107.8° |
| 2041-06-05 Wed | 24 | — | unknown | 03:00–03:40 (good, 0.67 h) | 89.7° 09:05 | 4.65 | 41% | 117.1° |
| 2041-06-06 Thu | 25 | — | unknown | 03:00–03:40 (good, 0.67 h) | 89.6° 09:00 | 4.62 | 50% | 125.9° |
| 2041-06-07 Fri | 26 | — | unknown | 02:55–03:40 (good, 0.75 h) | 89.6° 09:00 | 4.6 | 60% | 133.9° |
| 2041-06-08 Sat | 27 | — | unknown | 02:50–03:40 (good, 0.83 h) | 89.7° 08:55 | 4.57 | 69% | 140.4° |
| 2041-06-09 Sun | 28 | — | unknown | 02:55–03:40 (good, 0.75 h) | 89.8° 08:50 | 4.55 | 78% | 144.5° |
| 2041-06-10 Mon | 29 | — | unknown | 02:50–03:40 (good, 0.83 h) | 89.7° 08:45 | 4.53 | 86% | 145.0° |
| 2041-06-11 Tue | 27 | — | unknown | 02:50–03:40 (good, 0.83 h) | 89.5° 08:40 | 4.51 | 92% | 141.5° |
| 2041-06-12 Wed | 27 | — | unknown | 02:45–03:40 (good, 0.92 h) | 89.6° 08:40 | 4.49 | 97% | 134.6° |
| 2041-06-13 Thu | 28 | — | unknown | 02:40–03:40 (good, 1.0 h) | 89.8° 08:35 | 4.47 | 100% | 125.4° |
| 2041-06-14 Fri | 27 | — | unknown | 02:40–03:40 (good, 1.0 h) | 89.8° 08:30 | 4.46 | 100% | 114.7° |
| 2041-06-15 Sat | 25 | — | unknown | 02:45–03:40 (good, 0.92 h) | 89.6° 08:25 | 4.45 | 97% | 103.3° |
| 2041-06-16 Sun | 23 | — | unknown | 02:45–03:40 (good, 0.92 h) | 89.5° 08:25 | 4.44 | 92% | 91.4° |
| 2041-06-17 Mon | 22 | — | unknown | 02:50–03:40 (good, 0.83 h) | 89.7° 08:20 | 4.43 | 84% | 79.4° |
| 2041-06-18 Tue | 22 | — | unknown | 02:55–03:40 (good, 0.75 h) | 89.8° 08:15 | 4.43 | 74% | 67.8° |
| 2041-06-19 Wed | 23 | — | unknown | 02:35–03:40 (good, 1.08 h) | 89.7° 08:10 | 4.42 | 64% | 56.8° |
| 2041-06-20 Thu | 27 | — | unknown | 02:25–03:40 (good, 1.25 h) | 89.6° 08:05 | 4.42 | 52% | 47.0° |
| 2041-06-21 Fri | 31 | — | unknown | 02:15–03:40 (good, 1.42 h) | 89.6° 08:05 | 4.42 | 41% | 39.4° |
| 2041-06-22 Sat | 39 | — | unknown | 01:55–03:40 (good, 1.75 h) | 89.7° 08:00 | 4.43 | 30% | 35.2° |
| 2041-06-23 Sun | 44 | — | unknown | 01:50–03:40 (good, 1.83 h) | 89.8° 07:55 | 4.43 | 21% | 35.3° |
| 2041-06-24 Mon | 49 | — | unknown | 01:45–03:40 (good, 1.92 h) | 89.7° 07:50 | 4.44 | 13% | 39.7° |
| 2041-06-25 Tue | 53 | — | unknown | 01:45–03:40 (good, 1.92 h) | 89.5° 07:45 | 4.45 | 7% | 46.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-05-27&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.