← 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. |
|---|---|---|---|---|---|---|---|---|
| 2045-05-18 Thu | 95 | — | unknown | 00:35–04:00 (good, 3.42 h) | 71.1° 05:35 | 5.4 | 6% | 120.1° |
| 2045-05-19 Fri | 95 | — | unknown | 00:30–04:00 (good, 3.5 h) | 71.1° 05:30 | 5.35 | 13% | 128.0° |
| 2045-05-20 Sat | 96 | — | unknown | 00:25–04:00 (good, 3.58 h) | 71.1° 05:25 | 5.3 | 22% | 133.7° |
| 2045-05-21 Sun | 98 | — | unknown | 00:25–04:00 (good, 3.58 h) | 71.1° 05:25 | 5.25 | 32% | 136.4° |
| 2045-05-22 Mon | 98 | — | unknown | 00:20–03:55 (good, 3.58 h) | 71.1° 05:20 | 5.2 | 43% | 135.3° |
| 2045-05-23 Tue | 98 | — | unknown | 00:20–03:55 (good, 3.58 h) | 71.1° 05:15 | 5.16 | 55% | 131.0° |
| 2045-05-24 Wed | 97 | — | unknown | 00:15–03:55 (good, 3.67 h) | 71.1° 05:10 | 5.11 | 66% | 124.2° |
| 2045-05-25 Thu | 95 | — | unknown | 00:15–03:50 (good, 3.58 h) | 71.1° 05:05 | 5.06 | 76% | 115.9° |
| 2045-05-26 Fri | 92 | — | unknown | 00:15–03:50 (good, 3.58 h) | 71.1° 05:05 | 5.02 | 84% | 106.8° |
| 2045-05-27 Sat | 75 | — | unknown | 00:20–03:50 (good, 3.5 h) | 71.1° 05:00 | 4.98 | 91% | 97.3° |
| 2045-05-28 Sun | 66 | — | unknown | 00:35–03:50 (good, 3.25 h) | 71.1° 04:55 | 4.93 | 96% | 87.8° |
| 2045-05-29 Mon | 56 | — | unknown | 01:15–03:50 (good, 2.58 h) | 71.1° 04:50 | 4.89 | 99% | 78.4° |
| 2045-05-30 Tue | 49 | — | unknown | 01:50–03:45 (good, 1.92 h) | 71.1° 04:50 | 4.86 | 100% | 69.5° |
| 2045-05-31 Wed | 44 | — | unknown | 02:25–03:45 (good, 1.33 h) | 71.1° 04:45 | 4.82 | 98% | 61.4° |
| 2045-06-01 Thu | 41 | — | unknown | 23:15–03:45 (marginal, 4.5 h) | 71.1° 04:40 | 4.78 | 95% | 54.2° |
| 2045-06-02 Fri | 48 | — | unknown | 23:35–23:45 (good, 0.17 h) | 71.1° 04:35 | 4.75 | 90% | 48.6° |
| 2045-06-03 Sat | 65 | — | unknown | 01:40–03:15 (good, 1.58 h) | 71.1° 04:30 | 4.71 | 84% | 44.8° |
| 2045-06-04 Sun | 74 | — | unknown | 23:25–03:40 (good, 4.25 h) | 71.1° 04:30 | 4.68 | 76% | 43.4° |
| 2045-06-05 Mon | 83 | — | unknown | 23:25–03:40 (good, 4.25 h) | 71.1° 04:25 | 4.65 | 68% | 44.6° |
| 2045-06-06 Tue | 92 | — | unknown | 23:20–03:40 (good, 4.33 h) | 71.1° 04:20 | 4.62 | 59% | 48.2° |
| 2045-06-07 Wed | 95 | — | unknown | 23:15–03:40 (good, 4.42 h) | 71.1° 04:15 | 4.6 | 49% | 53.6° |
| 2045-06-08 Thu | 98 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 04:10 | 4.57 | 40% | 60.6° |
| 2045-06-09 Fri | 100 | — | unknown | 23:05–03:40 (good, 4.58 h) | 71.1° 04:10 | 4.55 | 30% | 68.7° |
| 2045-06-10 Sat | 100 | — | unknown | 23:05–03:40 (good, 4.58 h) | 71.1° 04:05 | 4.53 | 21% | 77.6° |
| 2045-06-11 Sun | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 04:00 | 4.51 | 13% | 87.1° |
| 2045-06-12 Mon | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 03:55 | 4.49 | 7% | 97.0° |
| 2045-06-13 Tue | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 03:55 | 4.47 | 2% | 107.0° |
| 2045-06-14 Wed | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 03:50 | 4.46 | 0% | 116.7° |
| 2045-06-15 Thu | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 03:45 | 4.45 | 1% | 125.4° |
| 2045-06-16 Fri | 100 | — | unknown | 23:10–03:40 (good, 4.5 h) | 71.1° 03:40 | 4.44 | 5% | 132.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-05-18&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.