← 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. |
|---|---|---|---|---|---|---|---|---|
| 2030-04-21 Sun | 41 | — | unknown | 02:35–04:50 (good, 2.25 h) | 87.3° 08:20 | 6.94 | 80% | 81.2° |
| 2030-04-22 Mon | 42 | — | unknown | 02:25–04:50 (good, 2.42 h) | 87.3° 08:15 | 6.89 | 70% | 72.8° |
| 2030-04-23 Tue | 47 | — | unknown | 02:15–04:45 (good, 2.5 h) | 87.3° 08:10 | 6.83 | 59% | 65.4° |
| 2030-04-24 Wed | 56 | — | unknown | 01:55–04:45 (good, 2.83 h) | 87.3° 08:10 | 6.77 | 48% | 59.4° |
| 2030-04-25 Thu | 62 | — | unknown | 01:50–04:45 (good, 2.92 h) | 87.3° 08:05 | 6.71 | 38% | 55.0° |
| 2030-04-26 Fri | 67 | — | unknown | 01:45–04:40 (good, 2.92 h) | 87.3° 08:00 | 6.65 | 28% | 52.7° |
| 2030-04-27 Sat | 73 | — | unknown | 01:40–04:40 (good, 3.0 h) | 87.3° 07:55 | 6.59 | 20% | 52.5° |
| 2030-04-28 Sun | 77 | — | unknown | 01:35–04:35 (good, 3.0 h) | 87.3° 07:50 | 6.54 | 12% | 54.4° |
| 2030-04-29 Mon | 78 | — | unknown | 01:35–04:35 (good, 3.0 h) | 87.3° 07:50 | 6.48 | 7% | 58.0° |
| 2030-04-30 Tue | 80 | — | unknown | 01:30–04:35 (good, 3.08 h) | 87.3° 07:45 | 6.42 | 3% | 62.9° |
| 2030-05-01 Wed | 80 | — | unknown | 01:25–04:30 (good, 3.08 h) | 87.3° 07:40 | 6.36 | 0% | 68.9° |
| 2030-05-02 Thu | 82 | — | unknown | 01:20–04:30 (good, 3.17 h) | 87.3° 07:35 | 6.3 | 0% | 75.5° |
| 2030-05-03 Fri | 83 | — | unknown | 01:20–04:30 (good, 3.17 h) | 87.3° 07:35 | 6.25 | 2% | 82.5° |
| 2030-05-04 Sat | 83 | — | unknown | 01:15–04:25 (good, 3.17 h) | 87.3° 07:30 | 6.19 | 5% | 89.7° |
| 2030-05-05 Sun | 86 | — | unknown | 01:10–04:25 (good, 3.25 h) | 87.3° 07:25 | 6.13 | 10% | 96.9° |
| 2030-05-06 Mon | 86 | — | unknown | 01:05–04:20 (good, 3.25 h) | 87.3° 07:20 | 6.07 | 16% | 104.0° |
| 2030-05-07 Tue | 88 | — | unknown | 01:00–04:20 (good, 3.33 h) | 87.3° 07:15 | 6.02 | 24% | 110.7° |
| 2030-05-08 Wed | 88 | — | unknown | 01:00–04:20 (good, 3.33 h) | 87.3° 07:15 | 5.96 | 32% | 116.8° |
| 2030-05-09 Thu | 89 | — | unknown | 01:00–04:15 (good, 3.25 h) | 87.3° 07:10 | 5.9 | 42% | 122.0° |
| 2030-05-10 Fri | 90 | — | unknown | 00:55–04:15 (good, 3.33 h) | 87.3° 07:05 | 5.85 | 52% | 125.8° |
| 2030-05-11 Sat | 90 | — | unknown | 00:55–04:15 (good, 3.33 h) | 87.3° 07:00 | 5.79 | 63% | 127.7° |
| 2030-05-12 Sun | 89 | — | unknown | 00:50–04:10 (good, 3.33 h) | 87.3° 06:55 | 5.74 | 73% | 127.2° |
| 2030-05-13 Mon | 89 | — | unknown | 00:50–04:10 (good, 3.33 h) | 87.3° 06:55 | 5.68 | 82% | 124.2° |
| 2030-05-14 Tue | 82 | — | unknown | 00:50–04:10 (good, 3.33 h) | 87.3° 06:50 | 5.63 | 90% | 118.9° |
| 2030-05-15 Wed | 74 | — | unknown | 00:50–04:05 (good, 3.25 h) | 87.3° 06:45 | 5.58 | 96% | 111.7° |
| 2030-05-16 Thu | 66 | — | unknown | 00:50–04:05 (good, 3.25 h) | 87.3° 06:40 | 5.52 | 100% | 103.3° |
| 2030-05-17 Fri | 59 | — | unknown | 00:55–04:05 (good, 3.17 h) | 87.3° 06:40 | 5.47 | 100% | 94.1° |
| 2030-05-18 Sat | 53 | — | unknown | 01:15–04:00 (good, 2.75 h) | 87.3° 06:35 | 5.42 | 97% | 84.8° |
| 2030-05-19 Sun | 50 | — | unknown | 01:15–04:00 (good, 2.75 h) | 87.3° 06:30 | 5.37 | 91% | 75.9° |
| 2030-05-20 Mon | 51 | — | unknown | 00:45–04:00 (good, 3.25 h) | 87.3° 06:25 | 5.32 | 83% | 67.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-04-21&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.