← 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. |
|---|---|---|---|---|---|---|---|---|
| 2037-04-19 Sun | 63 | — | unknown | 02:30–04:55 (good, 2.42 h) | 71.1° 07:30 | 7.04 | 18% | 122.0° |
| 2037-04-20 Mon | 64 | — | unknown | 02:25–04:50 (good, 2.42 h) | 71.1° 07:25 | 6.98 | 27% | 129.3° |
| 2037-04-21 Tue | 65 | — | unknown | 02:20–04:50 (good, 2.5 h) | 71.1° 07:20 | 6.93 | 37% | 134.8° |
| 2037-04-22 Wed | 66 | — | unknown | 02:20–04:50 (good, 2.5 h) | 71.1° 07:15 | 6.87 | 48% | 137.4° |
| 2037-04-23 Thu | 65 | — | unknown | 02:15–04:45 (good, 2.5 h) | 71.1° 07:15 | 6.81 | 59% | 136.5° |
| 2037-04-24 Fri | 66 | — | unknown | 02:15–04:45 (good, 2.5 h) | 71.1° 07:10 | 6.75 | 70% | 132.1° |
| 2037-04-25 Sat | 59 | — | unknown | 02:10–04:40 (good, 2.5 h) | 71.1° 07:05 | 6.69 | 80% | 124.9° |
| 2037-04-26 Sun | 56 | — | unknown | 02:10–04:40 (good, 2.5 h) | 71.1° 07:00 | 6.64 | 89% | 115.9° |
| 2037-04-27 Mon | 50 | — | unknown | 02:15–04:40 (good, 2.42 h) | 71.1° 06:55 | 6.58 | 95% | 105.7° |
| 2037-04-28 Tue | 42 | — | unknown | 02:30–04:35 (good, 2.08 h) | 71.1° 06:55 | 6.52 | 99% | 95.1° |
| 2037-04-29 Wed | 36 | — | unknown | 03:15–04:35 (good, 1.33 h) | 71.1° 06:50 | 6.46 | 100% | 84.4° |
| 2037-04-30 Thu | 32 | — | unknown | 03:55–04:35 (good, 0.67 h) | 71.1° 06:45 | 6.4 | 98% | 74.1° |
| 2037-05-01 Fri | 29 | — | unknown | 04:25–04:30 (good, 0.08 h) | 71.1° 06:40 | 6.34 | 94% | 64.5° |
| 2037-05-02 Sat | 29 | — | unknown | 01:15–04:30 (marginal, 3.25 h) | 71.1° 06:40 | 6.29 | 88% | 56.1° |
| 2037-05-03 Sun | 31 | — | unknown | 04:15–04:25 (good, 0.17 h) | 71.1° 06:35 | 6.23 | 80% | 49.3° |
| 2037-05-04 Mon | 36 | — | unknown | 02:40–04:25 (good, 1.75 h) | 71.1° 06:30 | 6.17 | 72% | 44.6° |
| 2037-05-05 Tue | 52 | — | unknown | 01:25–04:25 (good, 3.0 h) | 71.1° 06:25 | 6.11 | 62% | 42.6° |
| 2037-05-06 Wed | 61 | — | unknown | 01:20–04:20 (good, 3.0 h) | 71.1° 06:20 | 6.06 | 53% | 43.4° |
| 2037-05-07 Thu | 70 | — | unknown | 01:15–04:20 (good, 3.08 h) | 71.1° 06:20 | 6.0 | 43% | 46.7° |
| 2037-05-08 Fri | 77 | — | unknown | 01:15–04:20 (good, 3.08 h) | 71.1° 06:15 | 5.94 | 34% | 52.0° |
| 2037-05-09 Sat | 83 | — | unknown | 01:10–04:15 (good, 3.08 h) | 71.1° 06:10 | 5.89 | 25% | 58.7° |
| 2037-05-10 Sun | 85 | — | unknown | 01:05–04:15 (good, 3.17 h) | 71.1° 06:05 | 5.83 | 18% | 66.4° |
| 2037-05-11 Mon | 87 | — | unknown | 01:00–04:15 (good, 3.25 h) | 71.1° 06:00 | 5.78 | 11% | 74.8° |
| 2037-05-12 Tue | 88 | — | unknown | 00:55–04:10 (good, 3.25 h) | 71.1° 06:00 | 5.72 | 6% | 83.6° |
| 2037-05-13 Wed | 90 | — | unknown | 00:55–04:10 (good, 3.25 h) | 71.1° 05:55 | 5.67 | 2% | 92.7° |
| 2037-05-14 Thu | 91 | — | unknown | 00:50–04:10 (good, 3.33 h) | 71.1° 05:50 | 5.61 | 0% | 102.0° |
| 2037-05-15 Fri | 90 | — | unknown | 00:45–04:05 (good, 3.33 h) | 71.1° 05:45 | 5.56 | 1% | 111.1° |
| 2037-05-16 Sat | 92 | — | unknown | 00:40–04:05 (good, 3.42 h) | 71.1° 05:45 | 5.51 | 3% | 119.8° |
| 2037-05-17 Sun | 94 | — | unknown | 00:40–04:05 (good, 3.42 h) | 71.1° 05:40 | 5.46 | 8% | 127.5° |
| 2037-05-18 Mon | 95 | — | unknown | 00:35–04:00 (good, 3.42 h) | 71.1° 05:35 | 5.4 | 15% | 133.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-04-19&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.