← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-05-02 Wed | 56 | — | unknown | 01:35–04:30 (good, 2.92 h) | 71.1° 06:35 | 6.27 | 60% | 47.1° |
| 2040-05-03 Thu | 65 | — | unknown | 01:30–04:25 (good, 2.92 h) | 71.1° 06:35 | 6.21 | 49% | 47.5° |
| 2040-05-04 Fri | 73 | — | unknown | 01:30–04:25 (good, 2.92 h) | 71.1° 06:30 | 6.16 | 38% | 51.0° |
| 2040-05-05 Sat | 79 | — | unknown | 01:25–04:25 (good, 3.0 h) | 71.1° 06:25 | 6.1 | 27% | 56.7° |
| 2040-05-06 Sun | 80 | — | unknown | 01:20–04:20 (good, 3.0 h) | 71.1° 06:20 | 6.04 | 18% | 63.9° |
| 2040-05-07 Mon | 82 | — | unknown | 01:15–04:20 (good, 3.08 h) | 71.1° 06:15 | 5.98 | 11% | 72.1° |
| 2040-05-08 Tue | 84 | — | unknown | 01:10–04:20 (good, 3.17 h) | 71.1° 06:15 | 5.93 | 5% | 80.7° |
| 2040-05-09 Wed | 85 | — | unknown | 01:10–04:15 (good, 3.08 h) | 71.1° 06:10 | 5.87 | 2% | 89.5° |
| 2040-05-10 Thu | 86 | — | unknown | 01:05–04:15 (good, 3.17 h) | 71.1° 06:05 | 5.82 | 0% | 98.1° |
| 2040-05-11 Fri | 87 | — | unknown | 01:00–04:15 (good, 3.25 h) | 71.1° 06:00 | 5.76 | 1% | 106.3° |
| 2040-05-12 Sat | 88 | — | unknown | 00:55–04:10 (good, 3.25 h) | 71.1° 06:00 | 5.71 | 3% | 114.0° |
| 2040-05-13 Sun | 90 | — | unknown | 00:50–04:10 (good, 3.33 h) | 71.1° 05:55 | 5.65 | 7% | 120.8° |
| 2040-05-14 Mon | 91 | — | unknown | 00:50–04:10 (good, 3.33 h) | 71.1° 05:50 | 5.6 | 13% | 126.5° |
| 2040-05-15 Tue | 91 | — | unknown | 00:45–04:05 (good, 3.33 h) | 71.1° 05:45 | 5.55 | 20% | 130.6° |
| 2040-05-16 Wed | 92 | — | unknown | 00:45–04:05 (good, 3.33 h) | 71.1° 05:40 | 5.49 | 28% | 132.8° |
| 2040-05-17 Thu | 93 | — | unknown | 00:40–04:05 (good, 3.42 h) | 71.1° 05:40 | 5.44 | 37% | 132.8° |
| 2040-05-18 Fri | 92 | — | unknown | 00:35–04:00 (good, 3.42 h) | 71.1° 05:35 | 5.39 | 46% | 130.5° |
| 2040-05-19 Sat | 92 | — | unknown | 00:35–04:00 (good, 3.42 h) | 71.1° 05:30 | 5.34 | 56% | 126.1° |
| 2040-05-20 Sun | 92 | — | unknown | 00:30–04:00 (good, 3.5 h) | 71.1° 05:25 | 5.29 | 66% | 120.1° |
| 2040-05-21 Mon | 89 | — | unknown | 00:30–03:55 (good, 3.42 h) | 71.1° 05:20 | 5.24 | 75% | 112.7° |
| 2040-05-22 Tue | 75 | — | unknown | 00:35–03:55 (good, 3.33 h) | 71.1° 05:20 | 5.19 | 84% | 104.3° |
| 2040-05-23 Wed | 66 | — | unknown | 00:40–03:55 (good, 3.25 h) | 71.1° 05:15 | 5.15 | 91% | 95.1° |
| 2040-05-24 Thu | 57 | — | unknown | 01:15–03:55 (good, 2.67 h) | 71.1° 05:10 | 5.1 | 97% | 85.5° |
| 2040-05-25 Fri | 48 | — | unknown | 02:00–03:50 (good, 1.83 h) | 71.1° 05:05 | 5.05 | 100% | 75.8° |
| 2040-05-26 Sat | 42 | — | unknown | 02:40–03:50 (good, 1.17 h) | 71.1° 05:05 | 5.01 | 100% | 66.4° |
| 2040-05-27 Sun | 39 | — | unknown | 03:10–03:50 (good, 0.67 h) | 71.1° 05:00 | 4.97 | 97% | 58.0° |
| 2040-05-28 Mon | 41 | — | unknown | 03:05–03:15 (good, 0.17 h) | 71.1° 04:55 | 4.93 | 91% | 51.5° |
| 2040-05-29 Tue | 64 | — | unknown | 01:10–03:50 (good, 2.67 h) | 71.1° 04:50 | 4.89 | 84% | 47.6° |
| 2040-05-30 Wed | 76 | — | unknown | 23:45–03:45 (good, 4.0 h) | 71.1° 04:45 | 4.85 | 74% | 47.1° |
| 2040-05-31 Thu | 89 | — | unknown | 23:40–03:45 (good, 4.08 h) | 71.1° 04:45 | 4.81 | 63% | 49.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-05-02&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.