← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-03-30 Fri | 33 | — | unknown | 03:55–05:30 (good, 1.58 h) | 87.3° 09:45 | 8.16 | 94% | 103.5° |
| 2040-03-31 Sat | 33 | — | unknown | 03:50–05:30 (good, 1.67 h) | 87.3° 09:40 | 8.1 | 87% | 97.4° |
| 2040-04-01 Sun | 34 | — | unknown | 03:45–05:30 (good, 1.75 h) | 87.3° 09:35 | 8.05 | 79% | 91.0° |
| 2040-04-02 Mon | 35 | — | unknown | 03:40–05:25 (good, 1.75 h) | 87.2° 09:35 | 7.99 | 68% | 84.5° |
| 2040-04-03 Tue | 38 | — | unknown | 03:30–05:25 (good, 1.92 h) | 87.3° 09:30 | 7.94 | 57% | 78.3° |
| 2040-04-04 Wed | 44 | — | unknown | 03:10–05:20 (good, 2.17 h) | 87.3° 09:25 | 7.88 | 46% | 72.7° |
| 2040-04-05 Thu | 51 | — | unknown | 03:05–05:20 (good, 2.25 h) | 87.3° 09:20 | 7.83 | 35% | 68.0° |
| 2040-04-06 Fri | 57 | — | unknown | 03:00–05:20 (good, 2.33 h) | 87.3° 09:15 | 7.77 | 24% | 64.6° |
| 2040-04-07 Sat | 57 | — | unknown | 03:00–05:15 (good, 2.25 h) | 87.2° 09:15 | 7.72 | 16% | 62.8° |
| 2040-04-08 Sun | 59 | — | unknown | 02:55–05:15 (good, 2.33 h) | 87.3° 09:10 | 7.66 | 8% | 62.7° |
| 2040-04-09 Mon | 60 | — | unknown | 02:50–05:15 (good, 2.42 h) | 87.3° 09:05 | 7.6 | 3% | 64.3° |
| 2040-04-10 Tue | 60 | — | unknown | 02:45–05:10 (good, 2.42 h) | 87.3° 09:00 | 7.55 | 1% | 67.3° |
| 2040-04-11 Wed | 62 | — | unknown | 02:40–05:10 (good, 2.5 h) | 87.2° 08:55 | 7.49 | 0% | 71.5° |
| 2040-04-12 Thu | 62 | — | unknown | 02:40–05:05 (good, 2.42 h) | 87.3° 08:55 | 7.43 | 2% | 76.4° |
| 2040-04-13 Fri | 63 | — | unknown | 02:35–05:05 (good, 2.5 h) | 87.3° 08:50 | 7.37 | 6% | 81.8° |
| 2040-04-14 Sat | 65 | — | unknown | 02:30–05:05 (good, 2.58 h) | 87.3° 08:45 | 7.32 | 11% | 87.4° |
| 2040-04-15 Sun | 65 | — | unknown | 02:25–05:00 (good, 2.58 h) | 87.3° 08:40 | 7.26 | 18% | 93.0° |
| 2040-04-16 Mon | 66 | — | unknown | 02:25–05:00 (good, 2.58 h) | 87.2° 08:35 | 7.2 | 26% | 98.5° |
| 2040-04-17 Tue | 66 | — | unknown | 02:20–04:55 (good, 2.58 h) | 87.3° 08:35 | 7.14 | 35% | 103.5° |
| 2040-04-18 Wed | 67 | — | unknown | 02:20–04:55 (good, 2.58 h) | 87.3° 08:30 | 7.08 | 44% | 108.1° |
| 2040-04-19 Thu | 67 | — | unknown | 02:20–04:55 (good, 2.58 h) | 87.3° 08:25 | 7.03 | 54% | 111.9° |
| 2040-04-20 Fri | 67 | — | unknown | 02:15–04:50 (good, 2.58 h) | 87.3° 08:20 | 6.97 | 63% | 114.9° |
| 2040-04-21 Sat | 66 | — | unknown | 02:15–04:50 (good, 2.58 h) | 87.2° 08:20 | 6.91 | 72% | 116.8° |
| 2040-04-22 Sun | 60 | — | unknown | 02:10–04:45 (good, 2.58 h) | 87.3° 08:15 | 6.85 | 81% | 117.4° |
| 2040-04-23 Mon | 59 | — | unknown | 02:10–04:45 (good, 2.58 h) | 87.3° 08:10 | 6.79 | 88% | 116.6° |
| 2040-04-24 Tue | 57 | — | unknown | 02:10–04:45 (good, 2.58 h) | 87.3° 08:05 | 6.74 | 94% | 114.2° |
| 2040-04-25 Wed | 54 | — | unknown | 02:10–04:40 (good, 2.5 h) | 87.2° 08:00 | 6.68 | 98% | 110.5° |
| 2040-04-26 Thu | 51 | — | unknown | 02:10–04:40 (good, 2.5 h) | 87.3° 08:00 | 6.62 | 100% | 105.5° |
| 2040-04-27 Fri | 48 | — | unknown | 02:10–04:40 (good, 2.5 h) | 87.3° 07:55 | 6.56 | 99% | 99.6° |
| 2040-04-28 Sat | 45 | — | unknown | 02:05–04:35 (good, 2.5 h) | 87.3° 07:50 | 6.5 | 96% | 93.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-03-30&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.