← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-04-18 Fri | 62 | — | unknown | 02:35–04:55 (good, 2.33 h) | 71.1° 07:35 | 7.11 | 2% | 71.8° |
| 2042-04-19 Sat | 63 | — | unknown | 02:30–04:55 (good, 2.42 h) | 71.1° 07:30 | 7.05 | 0% | 81.7° |
| 2042-04-20 Sun | 63 | — | unknown | 02:25–04:50 (good, 2.42 h) | 71.1° 07:25 | 7.0 | 1% | 91.9° |
| 2042-04-21 Mon | 65 | — | unknown | 02:20–04:50 (good, 2.5 h) | 71.1° 07:20 | 6.94 | 5% | 101.8° |
| 2042-04-22 Tue | 66 | — | unknown | 02:15–04:50 (good, 2.58 h) | 71.1° 07:20 | 6.88 | 11% | 111.0° |
| 2042-04-23 Wed | 66 | — | unknown | 02:15–04:45 (good, 2.5 h) | 71.1° 07:15 | 6.82 | 19% | 119.1° |
| 2042-04-24 Thu | 68 | — | unknown | 02:10–04:45 (good, 2.58 h) | 71.1° 07:10 | 6.76 | 28% | 125.6° |
| 2042-04-25 Fri | 67 | — | unknown | 02:10–04:40 (good, 2.5 h) | 71.1° 07:05 | 6.71 | 38% | 130.2° |
| 2042-04-26 Sat | 68 | — | unknown | 02:05–04:40 (good, 2.58 h) | 71.1° 07:00 | 6.65 | 48% | 132.5° |
| 2042-04-27 Sun | 69 | — | unknown | 02:00–04:40 (good, 2.67 h) | 71.1° 07:00 | 6.59 | 58% | 132.2° |
| 2042-04-28 Mon | 68 | — | unknown | 02:00–04:35 (good, 2.58 h) | 71.1° 06:55 | 6.53 | 68% | 129.7° |
| 2042-04-29 Tue | 69 | — | unknown | 01:55–04:35 (good, 2.67 h) | 71.1° 06:50 | 6.47 | 76% | 125.4° |
| 2042-04-30 Wed | 64 | — | unknown | 01:55–04:35 (good, 2.67 h) | 71.1° 06:45 | 6.41 | 84% | 119.6° |
| 2042-05-01 Thu | 59 | — | unknown | 01:55–04:30 (good, 2.58 h) | 71.1° 06:45 | 6.36 | 90% | 112.9° |
| 2042-05-02 Fri | 54 | — | unknown | 01:55–04:30 (good, 2.58 h) | 71.1° 06:40 | 6.3 | 95% | 105.5° |
| 2042-05-03 Sat | 49 | — | unknown | 02:00–04:25 (good, 2.42 h) | 71.1° 06:35 | 6.24 | 98% | 97.6° |
| 2042-05-04 Sun | 44 | — | unknown | 02:20–04:25 (good, 2.08 h) | 71.1° 06:30 | 6.18 | 100% | 89.5° |
| 2042-05-05 Mon | 40 | — | unknown | 02:50–04:25 (good, 1.58 h) | 71.1° 06:25 | 6.13 | 100% | 81.2° |
| 2042-05-06 Tue | 37 | — | unknown | 03:10–04:20 (good, 1.17 h) | 71.1° 06:25 | 6.07 | 97% | 73.1° |
| 2042-05-07 Wed | 36 | — | unknown | 03:15–04:20 (good, 1.08 h) | 71.1° 06:20 | 6.01 | 93% | 65.4° |
| 2042-05-08 Thu | 37 | — | unknown | 03:05–04:20 (good, 1.25 h) | 71.1° 06:15 | 5.96 | 87% | 58.4° |
| 2042-05-09 Fri | 40 | — | unknown | 02:10–04:15 (good, 2.08 h) | 71.1° 06:10 | 5.9 | 79% | 52.6° |
| 2042-05-10 Sat | 57 | — | unknown | 01:05–04:15 (good, 3.17 h) | 71.1° 06:05 | 5.84 | 70% | 48.7° |
| 2042-05-11 Sun | 66 | — | unknown | 01:00–04:15 (good, 3.25 h) | 71.1° 06:05 | 5.79 | 60% | 47.3° |
| 2042-05-12 Mon | 74 | — | unknown | 01:00–04:10 (good, 3.17 h) | 71.1° 06:00 | 5.73 | 49% | 48.8° |
| 2042-05-13 Tue | 83 | — | unknown | 00:55–04:10 (good, 3.25 h) | 71.1° 05:55 | 5.68 | 37% | 53.2° |
| 2042-05-14 Wed | 87 | — | unknown | 00:50–04:10 (good, 3.33 h) | 71.1° 05:50 | 5.62 | 27% | 59.9° |
| 2042-05-15 Thu | 90 | — | unknown | 00:45–04:05 (good, 3.33 h) | 71.1° 05:50 | 5.57 | 17% | 68.2° |
| 2042-05-16 Fri | 92 | — | unknown | 00:40–04:05 (good, 3.42 h) | 71.1° 05:45 | 5.52 | 9% | 77.6° |
| 2042-05-17 Sat | 94 | — | unknown | 00:40–04:05 (good, 3.42 h) | 71.1° 05:40 | 5.47 | 3% | 87.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-04-18&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.