← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-04-27 Fri | 0 | — | unknown | — | 79.2° 12:35 | 6.56 | 99% | 154.1° |
| 2040-04-28 Sat | 0 | — | unknown | — | 79.2° 12:30 | 6.5 | 96% | 144.6° |
| 2040-04-29 Sun | 0 | — | unknown | — | 79.2° 12:25 | 6.44 | 90% | 132.7° |
| 2040-04-30 Mon | 0 | — | unknown | — | 79.2° 12:20 | 6.39 | 81% | 119.8° |
| 2040-05-01 Tue | 0 | — | unknown | — | 79.2° 12:15 | 6.33 | 71% | 106.6° |
| 2040-05-02 Wed | 0 | — | unknown | — | 79.2° 12:15 | 6.27 | 60% | 93.4° |
| 2040-05-03 Thu | 0 | — | unknown | — | 79.2° 12:10 | 6.21 | 49% | 80.4° |
| 2040-05-04 Fri | 0 | — | unknown | — | 79.2° 12:05 | 6.16 | 38% | 67.6° |
| 2040-05-05 Sat | 0 | — | unknown | — | 79.2° 12:00 | 6.1 | 27% | 55.2° |
| 2040-05-06 Sun | 0 | — | unknown | — | 79.2° 11:55 | 6.04 | 18% | 43.5° |
| 2040-05-07 Mon | 0 | — | unknown | — | 79.2° 11:50 | 5.98 | 11% | 33.0° |
| 2040-05-08 Tue | 0 | — | unknown | — | 79.2° 11:45 | 5.93 | 5% | 25.0° |
| 2040-05-09 Wed | 0 | — | unknown | — | 79.2° 11:40 | 5.87 | 2% | 22.0° |
| 2040-05-10 Thu | 0 | — | unknown | — | 79.2° 11:40 | 5.82 | 0% | 25.5° |
| 2040-05-11 Fri | 0 | — | unknown | — | 79.2° 11:35 | 5.76 | 1% | 33.4° |
| 2040-05-12 Sat | 0 | — | unknown | — | 79.2° 11:30 | 5.71 | 3% | 43.1° |
| 2040-05-13 Sun | 0 | — | unknown | — | 79.2° 11:25 | 5.65 | 7% | 53.5° |
| 2040-05-14 Mon | 0 | — | unknown | — | 79.2° 11:20 | 5.6 | 13% | 64.2° |
| 2040-05-15 Tue | 0 | — | unknown | — | 79.2° 11:20 | 5.55 | 20% | 75.1° |
| 2040-05-16 Wed | 0 | — | unknown | — | 79.2° 11:15 | 5.49 | 28% | 86.0° |
| 2040-05-17 Thu | 0 | — | unknown | — | 79.2° 11:10 | 5.44 | 37% | 97.0° |
| 2040-05-18 Fri | 0 | — | unknown | — | 79.2° 11:05 | 5.39 | 46% | 108.1° |
| 2040-05-19 Sat | 0 | — | unknown | — | 79.2° 11:05 | 5.34 | 56% | 119.2° |
| 2040-05-20 Sun | 0 | — | unknown | — | 79.2° 11:00 | 5.29 | 66% | 130.3° |
| 2040-05-21 Mon | 0 | — | unknown | — | 79.2° 10:55 | 5.24 | 75% | 141.1° |
| 2040-05-22 Tue | 0 | — | unknown | — | 79.2° 10:50 | 5.19 | 84% | 150.8° |
| 2040-05-23 Wed | 0 | — | unknown | — | 79.2° 10:45 | 5.15 | 91% | 157.2° |
| 2040-05-24 Thu | 0 | — | unknown | — | 79.2° 10:45 | 5.1 | 97% | 156.7° |
| 2040-05-25 Fri | 0 | — | unknown | — | 79.2° 10:40 | 5.05 | 100% | 148.9° |
| 2040-05-26 Sat | 0 | — | unknown | — | 79.2° 10:35 | 5.01 | 100% | 137.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-04-27&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.