← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-04-05 Sat | 40 | — | unknown | 03:25–05:20 (good, 1.92 h) | 87.2° 09:25 | 7.85 | 100% | 113.6° |
| 2042-04-06 Sun | 40 | — | unknown | 03:25–05:20 (good, 1.92 h) | 87.3° 09:20 | 7.8 | 98% | 109.6° |
| 2042-04-07 Mon | 38 | — | unknown | 03:25–05:15 (good, 1.83 h) | 87.3° 09:15 | 7.74 | 95% | 104.8° |
| 2042-04-08 Tue | 38 | — | unknown | 03:20–05:15 (good, 1.92 h) | 87.3° 09:10 | 7.69 | 90% | 99.4° |
| 2042-04-09 Wed | 39 | — | unknown | 03:15–05:15 (good, 2.0 h) | 87.2° 09:05 | 7.63 | 83% | 93.6° |
| 2042-04-10 Thu | 39 | — | unknown | 03:10–05:10 (good, 2.0 h) | 87.2° 09:05 | 7.57 | 75% | 87.6° |
| 2042-04-11 Fri | 41 | — | unknown | 03:05–05:10 (good, 2.08 h) | 87.3° 09:00 | 7.52 | 66% | 81.6° |
| 2042-04-12 Sat | 48 | — | unknown | 02:40–05:10 (good, 2.5 h) | 87.3° 08:55 | 7.46 | 56% | 75.7° |
| 2042-04-13 Sun | 54 | — | unknown | 02:35–05:05 (good, 2.5 h) | 87.3° 08:50 | 7.4 | 45% | 70.4° |
| 2042-04-14 Mon | 60 | — | unknown | 02:30–05:05 (good, 2.58 h) | 87.2° 08:45 | 7.34 | 34% | 65.9° |
| 2042-04-15 Tue | 64 | — | unknown | 02:30–05:00 (good, 2.5 h) | 87.3° 08:45 | 7.29 | 24% | 62.6° |
| 2042-04-16 Wed | 65 | — | unknown | 02:25–05:00 (good, 2.58 h) | 87.3° 08:40 | 7.23 | 14% | 61.2° |
| 2042-04-17 Thu | 67 | — | unknown | 02:20–05:00 (good, 2.67 h) | 87.3° 08:35 | 7.17 | 7% | 61.8° |
| 2042-04-18 Fri | 68 | — | unknown | 02:15–04:55 (good, 2.67 h) | 87.3° 08:30 | 7.11 | 2% | 64.4° |
| 2042-04-19 Sat | 68 | — | unknown | 02:15–04:55 (good, 2.67 h) | 87.2° 08:30 | 7.05 | 0% | 68.9° |
| 2042-04-20 Sun | 69 | — | unknown | 02:10–04:50 (good, 2.67 h) | 87.3° 08:25 | 7.0 | 1% | 74.7° |
| 2042-04-21 Mon | 71 | — | unknown | 02:05–04:50 (good, 2.75 h) | 87.3° 08:20 | 6.94 | 5% | 81.2° |
| 2042-04-22 Tue | 72 | — | unknown | 02:00–04:50 (good, 2.83 h) | 87.3° 08:15 | 6.88 | 11% | 88.1° |
| 2042-04-23 Wed | 72 | — | unknown | 01:55–04:45 (good, 2.83 h) | 87.2° 08:10 | 6.82 | 19% | 94.8° |
| 2042-04-24 Thu | 73 | — | unknown | 01:55–04:45 (good, 2.83 h) | 87.2° 08:10 | 6.76 | 28% | 101.0° |
| 2042-04-25 Fri | 72 | — | unknown | 01:55–04:40 (good, 2.75 h) | 87.3° 08:05 | 6.71 | 38% | 106.7° |
| 2042-04-26 Sat | 73 | — | unknown | 01:50–04:40 (good, 2.83 h) | 87.3° 08:00 | 6.65 | 48% | 111.4° |
| 2042-04-27 Sun | 74 | — | unknown | 01:50–04:40 (good, 2.83 h) | 87.3° 07:55 | 6.59 | 58% | 115.1° |
| 2042-04-28 Mon | 73 | — | unknown | 01:45–04:35 (good, 2.83 h) | 87.2° 07:50 | 6.53 | 68% | 117.6° |
| 2042-04-29 Tue | 73 | — | unknown | 01:45–04:35 (good, 2.83 h) | 87.3° 07:50 | 6.47 | 76% | 118.8° |
| 2042-04-30 Wed | 68 | — | unknown | 01:40–04:35 (good, 2.92 h) | 87.3° 07:45 | 6.41 | 84% | 118.6° |
| 2042-05-01 Thu | 66 | — | unknown | 01:40–04:30 (good, 2.83 h) | 87.3° 07:40 | 6.36 | 90% | 117.2° |
| 2042-05-02 Fri | 64 | — | unknown | 01:40–04:30 (good, 2.83 h) | 87.3° 07:35 | 6.3 | 95% | 114.5° |
| 2042-05-03 Sat | 60 | — | unknown | 01:40–04:25 (good, 2.75 h) | 87.2° 07:35 | 6.24 | 98% | 110.7° |
| 2042-05-04 Sun | 57 | — | unknown | 01:40–04:25 (good, 2.75 h) | 87.3° 07:30 | 6.18 | 100% | 106.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-04-05&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.