← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-04-13 Fri | 0 | — | unknown | — | 89.5° 12:35 | 7.37 | 6% | 41.4° |
| 2040-04-14 Sat | 0 | — | unknown | — | 89.6° 12:35 | 7.32 | 11% | 48.1° |
| 2040-04-15 Sun | 0 | — | unknown | — | 89.8° 12:30 | 7.26 | 18% | 56.1° |
| 2040-04-16 Mon | 0 | — | unknown | — | 89.8° 12:25 | 7.2 | 26% | 64.8° |
| 2040-04-17 Tue | 0 | — | unknown | — | 89.7° 12:20 | 7.14 | 35% | 74.0° |
| 2040-04-18 Wed | 0 | — | unknown | — | 89.5° 12:20 | 7.08 | 44% | 83.4° |
| 2040-04-19 Thu | 0 | — | unknown | — | 89.7° 12:15 | 7.03 | 54% | 93.0° |
| 2040-04-20 Fri | 0 | — | unknown | — | 89.8° 12:10 | 6.97 | 63% | 102.6° |
| 2040-04-21 Sat | 0 | — | unknown | — | 89.7° 12:05 | 6.91 | 72% | 112.2° |
| 2040-04-22 Sun | 0 | — | unknown | — | 89.6° 12:00 | 6.85 | 81% | 121.5° |
| 2040-04-23 Mon | 0 | — | unknown | — | 89.7° 11:55 | 6.79 | 88% | 130.2° |
| 2040-04-24 Tue | 0 | — | unknown | — | 89.8° 11:50 | 6.74 | 94% | 137.6° |
| 2040-04-25 Wed | 0 | — | unknown | — | 89.7° 11:45 | 6.68 | 98% | 142.5° |
| 2040-04-26 Thu | 1 | — | unknown | — | 89.5° 11:40 | 6.62 | 100% | 143.5° |
| 2040-04-27 Fri | 1 | — | unknown | — | 89.6° 11:40 | 6.56 | 99% | 140.0° |
| 2040-04-28 Sat | 1 | — | unknown | — | 89.8° 11:35 | 6.5 | 96% | 132.7° |
| 2040-04-29 Sun | 1 | — | unknown | — | 89.8° 11:30 | 6.44 | 90% | 123.2° |
| 2040-04-30 Mon | 1 | — | unknown | — | 89.7° 11:25 | 6.39 | 81% | 112.5° |
| 2040-05-01 Tue | 1 | — | unknown | — | 89.5° 11:25 | 6.33 | 71% | 101.2° |
| 2040-05-02 Wed | 1 | — | unknown | — | 89.7° 11:20 | 6.27 | 60% | 89.7° |
| 2040-05-03 Thu | 1 | — | unknown | — | 89.8° 11:15 | 6.21 | 49% | 78.4° |
| 2040-05-04 Fri | 1 | — | unknown | — | 89.8° 11:10 | 6.16 | 38% | 67.5° |
| 2040-05-05 Sat | 1 | — | unknown | — | 89.6° 11:05 | 6.1 | 27% | 57.3° |
| 2040-05-06 Sun | 2 | — | unknown | — | 89.6° 11:05 | 6.04 | 18% | 48.3° |
| 2040-05-07 Mon | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.7° 11:00 | 5.98 | 11% | 41.3° |
| 2040-05-08 Tue | 2 | — | unknown | 04:50–05:00 (marginal, 0.17 h) | 89.8° 10:55 | 5.93 | 5% | 37.1° |
| 2040-05-09 Wed | 2 | — | unknown | 04:45–05:00 (marginal, 0.25 h) | 89.7° 10:50 | 5.87 | 2% | 36.6° |
| 2040-05-10 Thu | 3 | — | unknown | 04:45–04:55 (marginal, 0.17 h) | 89.6° 10:45 | 5.82 | 0% | 39.8° |
| 2040-05-11 Fri | 4 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.6° 10:45 | 5.76 | 1% | 45.7° |
| 2040-05-12 Sat | 4 | — | unknown | 04:35–04:55 (marginal, 0.33 h) | 89.8° 10:40 | 5.71 | 3% | 53.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-04-13&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.