← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-04-17 Thu | 65 | — | unknown | 02:20–05:00 (good, 2.67 h) | 87.2° 08:35 | 7.19 | 16% | 52.5° |
| 2031-04-18 Fri | 67 | — | unknown | 02:15–04:55 (good, 2.67 h) | 87.2° 08:30 | 7.13 | 8% | 54.3° |
| 2031-04-19 Sat | 68 | — | unknown | 02:15–04:55 (good, 2.67 h) | 87.2° 08:30 | 7.07 | 4% | 58.1° |
| 2031-04-20 Sun | 70 | — | unknown | 02:10–04:55 (good, 2.75 h) | 87.2° 08:25 | 7.02 | 1% | 63.6° |
| 2031-04-21 Mon | 70 | — | unknown | 02:05–04:50 (good, 2.75 h) | 87.2° 08:20 | 6.96 | 0% | 70.1° |
| 2031-04-22 Tue | 72 | — | unknown | 02:00–04:50 (good, 2.83 h) | 87.2° 08:15 | 6.9 | 2% | 77.2° |
| 2031-04-23 Wed | 71 | — | unknown | 02:00–04:45 (good, 2.75 h) | 87.2° 08:15 | 6.84 | 5% | 84.6° |
| 2031-04-24 Thu | 73 | — | unknown | 01:55–04:45 (good, 2.83 h) | 87.2° 08:10 | 6.78 | 10% | 92.0° |
| 2031-04-25 Fri | 75 | — | unknown | 01:50–04:45 (good, 2.92 h) | 87.2° 08:05 | 6.72 | 16% | 99.2° |
| 2031-04-26 Sat | 75 | — | unknown | 01:45–04:40 (good, 2.92 h) | 87.2° 08:00 | 6.67 | 24% | 106.2° |
| 2031-04-27 Sun | 77 | — | unknown | 01:40–04:40 (good, 3.0 h) | 87.2° 07:55 | 6.61 | 32% | 112.6° |
| 2031-04-28 Mon | 76 | — | unknown | 01:40–04:35 (good, 2.92 h) | 87.2° 07:55 | 6.55 | 42% | 118.3° |
| 2031-04-29 Tue | 77 | — | unknown | 01:40–04:35 (good, 2.92 h) | 87.2° 07:50 | 6.49 | 51% | 122.9° |
| 2031-04-30 Wed | 78 | — | unknown | 01:35–04:35 (good, 3.0 h) | 87.2° 07:45 | 6.43 | 61% | 126.2° |
| 2031-05-01 Thu | 77 | — | unknown | 01:35–04:30 (good, 2.92 h) | 87.2° 07:40 | 6.38 | 70% | 127.6° |
| 2031-05-02 Fri | 78 | — | unknown | 01:30–04:30 (good, 3.0 h) | 87.2° 07:35 | 6.32 | 79% | 127.0° |
| 2031-05-03 Sat | 77 | — | unknown | 01:30–04:30 (good, 3.0 h) | 87.2° 07:35 | 6.26 | 87% | 124.2° |
| 2031-05-04 Sun | 69 | — | unknown | 01:30–04:25 (good, 2.92 h) | 87.2° 07:30 | 6.2 | 94% | 119.3° |
| 2031-05-05 Mon | 65 | — | unknown | 01:30–04:25 (good, 2.92 h) | 87.2° 07:25 | 6.14 | 98% | 112.8° |
| 2031-05-06 Tue | 59 | — | unknown | 01:30–04:25 (good, 2.92 h) | 87.2° 07:20 | 6.09 | 100% | 104.9° |
| 2031-05-07 Wed | 52 | — | unknown | 01:35–04:20 (good, 2.75 h) | 87.2° 07:20 | 6.03 | 99% | 96.3° |
| 2031-05-08 Thu | 48 | — | unknown | 01:45–04:20 (good, 2.58 h) | 87.2° 07:15 | 5.97 | 96% | 87.3° |
| 2031-05-09 Fri | 45 | — | unknown | 01:50–04:15 (good, 2.42 h) | 87.2° 07:10 | 5.92 | 89% | 78.4° |
| 2031-05-10 Sat | 46 | — | unknown | 01:25–04:15 (good, 2.83 h) | 87.2° 07:05 | 5.86 | 81% | 70.1° |
| 2031-05-11 Sun | 51 | — | unknown | 01:15–04:15 (good, 3.0 h) | 87.2° 07:00 | 5.81 | 71% | 62.8° |
| 2031-05-12 Mon | 64 | — | unknown | 00:45–04:10 (good, 3.42 h) | 87.2° 07:00 | 5.75 | 60% | 57.1° |
| 2031-05-13 Tue | 73 | — | unknown | 00:40–04:10 (good, 3.5 h) | 87.2° 06:55 | 5.7 | 48% | 53.5° |
| 2031-05-14 Wed | 81 | — | unknown | 00:35–04:10 (good, 3.58 h) | 87.2° 06:50 | 5.64 | 38% | 52.3° |
| 2031-05-15 Thu | 88 | — | unknown | 00:30–04:05 (good, 3.58 h) | 87.2° 06:45 | 5.59 | 27% | 53.6° |
| 2031-05-16 Fri | 95 | — | unknown | 00:25–04:05 (good, 3.67 h) | 87.2° 06:40 | 5.54 | 18% | 56.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-04-17&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.