← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-04-19 Mon | 46 | — | unknown | 02:45–04:55 (good, 2.17 h) | 71.1° 07:30 | 7.08 | 99% | 108.9° |
| 2027-04-20 Tue | 41 | — | unknown | 02:50–04:55 (good, 2.08 h) | 71.1° 07:25 | 7.02 | 100% | 99.3° |
| 2027-04-21 Wed | 37 | — | unknown | 03:00–04:50 (good, 1.83 h) | 71.1° 07:25 | 6.96 | 99% | 89.7° |
| 2027-04-22 Thu | 34 | — | unknown | 03:25–04:50 (good, 1.42 h) | 71.1° 07:20 | 6.9 | 96% | 80.3° |
| 2027-04-23 Fri | 32 | — | unknown | 03:35–04:45 (good, 1.17 h) | 71.1° 07:15 | 6.84 | 90% | 71.3° |
| 2027-04-24 Sat | 32 | — | unknown | 03:35–04:45 (good, 1.17 h) | 71.1° 07:10 | 6.78 | 84% | 63.0° |
| 2027-04-25 Sun | 33 | — | unknown | 03:10–04:45 (good, 1.58 h) | 71.1° 07:05 | 6.73 | 76% | 55.6° |
| 2027-04-26 Mon | 36 | — | unknown | 02:25–04:40 (good, 2.25 h) | 71.1° 07:05 | 6.67 | 68% | 49.4° |
| 2027-04-27 Tue | 49 | — | unknown | 02:00–04:40 (good, 2.67 h) | 71.1° 07:00 | 6.61 | 59% | 45.0° |
| 2027-04-28 Wed | 54 | — | unknown | 01:55–04:35 (good, 2.67 h) | 71.1° 06:55 | 6.55 | 49% | 42.9° |
| 2027-04-29 Thu | 60 | — | unknown | 01:50–04:35 (good, 2.75 h) | 71.1° 06:50 | 6.49 | 40% | 43.3° |
| 2027-04-30 Fri | 66 | — | unknown | 01:45–04:35 (good, 2.83 h) | 71.1° 06:50 | 6.43 | 31% | 46.3° |
| 2027-05-01 Sat | 71 | — | unknown | 01:40–04:30 (good, 2.83 h) | 71.1° 06:45 | 6.38 | 22% | 51.6° |
| 2027-05-02 Sun | 76 | — | unknown | 01:40–04:30 (good, 2.83 h) | 71.1° 06:40 | 6.32 | 14% | 58.6° |
| 2027-05-03 Mon | 78 | — | unknown | 01:35–04:30 (good, 2.92 h) | 71.1° 06:35 | 6.26 | 8% | 67.0° |
| 2027-05-04 Tue | 77 | — | unknown | 01:30–04:25 (good, 2.92 h) | 71.1° 06:30 | 6.2 | 3% | 76.4° |
| 2027-05-05 Wed | 79 | — | unknown | 01:25–04:25 (good, 3.0 h) | 71.1° 06:30 | 6.15 | 0% | 86.3° |
| 2027-05-06 Thu | 81 | — | unknown | 01:25–04:25 (good, 3.0 h) | 71.1° 06:25 | 6.09 | 0% | 96.6° |
| 2027-05-07 Fri | 82 | — | unknown | 01:20–04:20 (good, 3.0 h) | 71.1° 06:20 | 6.03 | 3% | 106.9° |
| 2027-05-08 Sat | 82 | — | unknown | 01:15–04:20 (good, 3.08 h) | 71.1° 06:15 | 5.98 | 8% | 116.8° |
| 2027-05-09 Sun | 83 | — | unknown | 01:10–04:15 (good, 3.08 h) | 71.1° 06:10 | 5.92 | 16% | 125.6° |
| 2027-05-10 Mon | 85 | — | unknown | 01:05–04:15 (good, 3.17 h) | 71.1° 06:10 | 5.86 | 25% | 132.5° |
| 2027-05-11 Tue | 86 | — | unknown | 01:05–04:15 (good, 3.17 h) | 71.1° 06:05 | 5.81 | 36% | 136.7° |
| 2027-05-12 Wed | 86 | — | unknown | 01:05–04:10 (good, 3.08 h) | 71.1° 06:00 | 5.75 | 47% | 137.2° |
| 2027-05-13 Thu | 86 | — | unknown | 01:00–04:10 (good, 3.17 h) | 71.1° 05:55 | 5.7 | 58% | 134.1° |
| 2027-05-14 Fri | 87 | — | unknown | 01:00–04:10 (good, 3.17 h) | 71.1° 05:50 | 5.64 | 69% | 128.2° |
| 2027-05-15 Sat | 85 | — | unknown | 00:55–04:05 (good, 3.17 h) | 71.1° 05:50 | 5.59 | 79% | 120.4° |
| 2027-05-16 Sun | 83 | — | unknown | 00:55–04:05 (good, 3.17 h) | 71.1° 05:45 | 5.54 | 87% | 111.6° |
| 2027-05-17 Mon | 68 | — | unknown | 01:00–04:05 (good, 3.08 h) | 71.1° 05:40 | 5.48 | 93% | 102.2° |
| 2027-05-18 Tue | 60 | — | unknown | 01:00–04:05 (good, 3.08 h) | 71.1° 05:35 | 5.43 | 97% | 92.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-04-19&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.