← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-05-18 Fri | 6 | — | unknown | 04:10–04:45 (marginal, 0.58 h) | 89.8° 10:15 | 5.39 | 46% | 108.9° |
| 2040-05-19 Sat | 7 | — | unknown | 04:10–04:45 (marginal, 0.58 h) | 89.6° 10:10 | 5.34 | 56% | 118.1° |
| 2040-05-20 Sun | 8 | — | unknown | 04:05–04:45 (marginal, 0.67 h) | 89.5° 10:10 | 5.29 | 66% | 127.0° |
| 2040-05-21 Mon | 8 | — | unknown | 04:00–04:45 (marginal, 0.75 h) | 89.7° 10:05 | 5.24 | 75% | 134.9° |
| 2040-05-22 Tue | 8 | — | unknown | 04:05–04:45 (marginal, 0.67 h) | 89.8° 10:00 | 5.19 | 84% | 140.9° |
| 2040-05-23 Wed | 9 | — | unknown | 03:20–03:55 (marginal, 0.58 h) | 89.7° 09:55 | 5.15 | 91% | 143.6° |
| 2040-05-24 Thu | 9 | — | unknown | 03:15–03:55 (marginal, 0.67 h) | 89.6° 09:50 | 5.1 | 97% | 142.0° |
| 2040-05-25 Fri | 9 | — | unknown | 03:10–03:50 (marginal, 0.67 h) | 89.6° 09:50 | 5.05 | 100% | 136.0° |
| 2040-05-26 Sat | 10 | — | unknown | 03:05–04:40 (marginal, 1.58 h) | 89.8° 09:45 | 5.01 | 100% | 127.1° |
| 2040-05-27 Sun | 11 | — | unknown | 03:05–04:40 (marginal, 1.58 h) | 89.8° 09:40 | 4.97 | 97% | 116.5° |
| 2040-05-28 Mon | 11 | — | unknown | 03:00–04:40 (marginal, 1.67 h) | 89.7° 09:35 | 4.93 | 91% | 105.0° |
| 2040-05-29 Tue | 11 | — | unknown | 02:55–04:35 (marginal, 1.67 h) | 89.5° 09:30 | 4.89 | 84% | 93.1° |
| 2040-05-30 Wed | 10 | — | unknown | 02:50–03:45 (marginal, 0.92 h) | 89.7° 09:30 | 4.85 | 74% | 81.4° |
| 2040-05-31 Thu | 11 | — | unknown | 02:50–04:35 (marginal, 1.75 h) | 89.8° 09:25 | 4.81 | 63% | 70.1° |
| 2040-06-01 Fri | 13 | — | unknown | 03:40–03:45 (good, 0.08 h) | 89.8° 09:20 | 4.77 | 52% | 59.6° |
| 2040-06-02 Sat | 15 | — | unknown | 03:30–03:45 (good, 0.25 h) | 89.6° 09:15 | 4.74 | 41% | 50.2° |
| 2040-06-03 Sun | 18 | — | unknown | 03:20–03:45 (good, 0.42 h) | 89.5° 09:15 | 4.71 | 31% | 42.7° |
| 2040-06-04 Mon | 23 | — | unknown | 03:05–03:40 (good, 0.58 h) | 89.7° 09:10 | 4.67 | 21% | 37.8° |
| 2040-06-05 Tue | 24 | — | unknown | 03:00–03:40 (good, 0.67 h) | 89.8° 09:05 | 4.64 | 14% | 36.4° |
| 2040-06-06 Wed | 25 | — | unknown | 02:55–03:40 (good, 0.75 h) | 89.7° 09:00 | 4.62 | 8% | 38.7° |
| 2040-06-07 Thu | 26 | — | unknown | 02:55–03:40 (good, 0.75 h) | 89.6° 08:55 | 4.59 | 3% | 43.9° |
| 2040-06-08 Fri | 28 | — | unknown | 02:50–03:40 (good, 0.83 h) | 89.6° 08:55 | 4.57 | 1% | 51.1° |
| 2040-06-09 Sat | 29 | — | unknown | 02:45–03:40 (good, 0.92 h) | 89.7° 08:50 | 4.54 | 0% | 59.4° |
| 2040-06-10 Sun | 30 | — | unknown | 02:40–03:40 (good, 1.0 h) | 89.8° 08:45 | 4.52 | 1% | 68.4° |
| 2040-06-11 Mon | 32 | — | unknown | 02:35–03:40 (good, 1.08 h) | 89.7° 08:40 | 4.5 | 4% | 77.7° |
| 2040-06-12 Tue | 33 | — | unknown | 02:35–03:40 (good, 1.08 h) | 89.5° 08:35 | 4.49 | 9% | 87.2° |
| 2040-06-13 Wed | 35 | — | unknown | 02:30–03:40 (good, 1.17 h) | 89.6° 08:35 | 4.47 | 15% | 96.7° |
| 2040-06-14 Thu | 36 | — | unknown | 02:25–03:40 (good, 1.25 h) | 89.8° 08:30 | 4.46 | 22% | 106.1° |
| 2040-06-15 Fri | 37 | — | unknown | 02:20–03:40 (good, 1.33 h) | 89.8° 08:25 | 4.45 | 31% | 115.4° |
| 2040-06-16 Sat | 39 | — | unknown | 02:20–03:40 (good, 1.33 h) | 89.6° 08:20 | 4.44 | 40% | 124.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-05-18&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.