← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-04-04 Sun | 0 | — | unknown | — | 79.1° 14:05 | 7.93 | 5% | 45.3° |
| 2027-04-05 Mon | 0 | — | unknown | — | 79.1° 14:00 | 7.87 | 1% | 33.5° |
| 2027-04-06 Tue | 0 | — | unknown | — | 79.1° 14:00 | 7.82 | 0% | 22.5° |
| 2027-04-07 Wed | 0 | — | unknown | — | 79.1° 13:55 | 7.76 | 1% | 15.0° |
| 2027-04-08 Thu | 0 | — | unknown | — | 79.1° 13:50 | 7.71 | 5% | 17.3° |
| 2027-04-09 Fri | 0 | — | unknown | — | 79.1° 13:45 | 7.65 | 10% | 27.3° |
| 2027-04-10 Sat | 0 | — | unknown | — | 79.1° 13:45 | 7.59 | 18% | 39.7° |
| 2027-04-11 Sun | 0 | — | unknown | — | 79.1° 13:40 | 7.54 | 28% | 52.9° |
| 2027-04-12 Mon | 0 | — | unknown | — | 79.1° 13:35 | 7.48 | 38% | 66.4° |
| 2027-04-13 Tue | 0 | — | unknown | — | 79.1° 13:30 | 7.42 | 50% | 80.0° |
| 2027-04-14 Wed | 0 | — | unknown | — | 79.1° 13:25 | 7.36 | 61% | 93.7° |
| 2027-04-15 Thu | 0 | — | unknown | — | 79.1° 13:25 | 7.31 | 72% | 107.4° |
| 2027-04-16 Fri | 0 | — | unknown | — | 79.1° 13:20 | 7.25 | 81% | 120.9° |
| 2027-04-17 Sat | 0 | — | unknown | — | 79.1° 13:15 | 7.19 | 89% | 134.2° |
| 2027-04-18 Sun | 0 | — | unknown | — | 79.1° 13:10 | 7.13 | 95% | 146.9° |
| 2027-04-19 Mon | 0 | — | unknown | — | 79.1° 13:05 | 7.08 | 99% | 158.2° |
| 2027-04-20 Tue | 0 | — | unknown | — | 79.1° 13:05 | 7.02 | 100% | 165.2° |
| 2027-04-21 Wed | 0 | — | unknown | — | 79.1° 13:00 | 6.96 | 99% | 162.4° |
| 2027-04-22 Thu | 0 | — | unknown | — | 79.1° 12:55 | 6.9 | 96% | 153.0° |
| 2027-04-23 Fri | 0 | — | unknown | — | 79.1° 12:50 | 6.84 | 90% | 141.9° |
| 2027-04-24 Sat | 0 | — | unknown | — | 79.1° 12:50 | 6.78 | 84% | 130.5° |
| 2027-04-25 Sun | 0 | — | unknown | — | 79.1° 12:45 | 6.73 | 76% | 118.9° |
| 2027-04-26 Mon | 0 | — | unknown | — | 79.1° 12:40 | 6.67 | 68% | 107.4° |
| 2027-04-27 Tue | 0 | — | unknown | — | 79.1° 12:35 | 6.61 | 59% | 96.0° |
| 2027-04-28 Wed | 0 | — | unknown | — | 79.1° 12:30 | 6.55 | 49% | 84.5° |
| 2027-04-29 Thu | 0 | — | unknown | — | 79.1° 12:30 | 6.49 | 40% | 73.0° |
| 2027-04-30 Fri | 0 | — | unknown | — | 79.1° 12:25 | 6.43 | 31% | 61.3° |
| 2027-05-01 Sat | 0 | — | unknown | — | 79.1° 12:20 | 6.38 | 22% | 49.6° |
| 2027-05-02 Sun | 0 | — | unknown | — | 79.1° 12:15 | 6.32 | 14% | 37.8° |
| 2027-05-03 Mon | 0 | — | unknown | — | 79.1° 12:10 | 6.26 | 8% | 26.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-04-04&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.