← 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. |
|---|---|---|---|---|---|---|---|---|
| 2037-04-16 Thu | 0 | — | unknown | — | 89.7° 12:25 | 7.22 | 2% | 40.5° |
| 2037-04-17 Fri | 0 | — | unknown | — | 89.5° 12:20 | 7.16 | 5% | 45.5° |
| 2037-04-18 Sat | 0 | — | unknown | — | 89.6° 12:20 | 7.1 | 11% | 52.8° |
| 2037-04-19 Sun | 0 | — | unknown | — | 89.8° 12:15 | 7.04 | 18% | 61.5° |
| 2037-04-20 Mon | 0 | — | unknown | — | 89.8° 12:10 | 6.98 | 27% | 71.2° |
| 2037-04-21 Tue | 0 | — | unknown | — | 89.6° 12:05 | 6.93 | 37% | 81.6° |
| 2037-04-22 Wed | 0 | — | unknown | — | 89.7° 12:00 | 6.87 | 48% | 92.3° |
| 2037-04-23 Thu | 0 | — | unknown | — | 89.8° 11:55 | 6.81 | 59% | 103.2° |
| 2037-04-24 Fri | 0 | — | unknown | — | 89.7° 11:50 | 6.75 | 70% | 114.0° |
| 2037-04-25 Sat | 0 | — | unknown | — | 89.6° 11:45 | 6.69 | 80% | 124.2° |
| 2037-04-26 Sun | 1 | — | unknown | — | 89.6° 11:45 | 6.64 | 89% | 133.0° |
| 2037-04-27 Mon | 1 | — | unknown | — | 89.7° 11:40 | 6.58 | 95% | 139.3° |
| 2037-04-28 Tue | 1 | — | unknown | — | 89.8° 11:35 | 6.52 | 99% | 141.7° |
| 2037-04-29 Wed | 1 | — | unknown | — | 89.7° 11:30 | 6.46 | 100% | 139.5° |
| 2037-04-30 Thu | 1 | — | unknown | — | 89.5° 11:25 | 6.4 | 98% | 133.6° |
| 2037-05-01 Fri | 1 | — | unknown | — | 89.6° 11:25 | 6.34 | 94% | 125.4° |
| 2037-05-02 Sat | 1 | — | unknown | — | 89.8° 11:20 | 6.29 | 88% | 116.1° |
| 2037-05-03 Sun | 1 | — | unknown | — | 89.8° 11:15 | 6.23 | 80% | 106.4° |
| 2037-05-04 Mon | 1 | — | unknown | — | 89.6° 11:10 | 6.17 | 72% | 96.5° |
| 2037-05-05 Tue | 1 | — | unknown | — | 89.5° 11:10 | 6.11 | 62% | 86.9° |
| 2037-05-06 Wed | 1 | — | unknown | — | 89.7° 11:05 | 6.06 | 53% | 77.4° |
| 2037-05-07 Thu | 1 | — | unknown | — | 89.8° 11:00 | 6.0 | 43% | 68.3° |
| 2037-05-08 Fri | 2 | — | unknown | — | 89.7° 10:55 | 5.94 | 34% | 59.8° |
| 2037-05-09 Sat | 2 | — | unknown | — | 89.6° 10:50 | 5.89 | 25% | 52.0° |
| 2037-05-10 Sun | 3 | — | unknown | 04:50–05:00 (marginal, 0.17 h) | 89.6° 10:50 | 5.83 | 18% | 45.4° |
| 2037-05-11 Mon | 4 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.7° 10:45 | 5.78 | 11% | 40.6° |
| 2037-05-12 Tue | 4 | — | unknown | 04:35–04:55 (marginal, 0.33 h) | 89.8° 10:40 | 5.72 | 6% | 38.4° |
| 2037-05-13 Wed | 4 | — | unknown | 04:30–04:55 (marginal, 0.42 h) | 89.7° 10:35 | 5.67 | 2% | 39.5° |
| 2037-05-14 Thu | 5 | — | unknown | 04:30–04:55 (marginal, 0.42 h) | 89.5° 10:30 | 5.61 | 0% | 43.8° |
| 2037-05-15 Fri | 5 | — | unknown | 04:25–04:50 (marginal, 0.42 h) | 89.6° 10:30 | 5.56 | 1% | 50.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-04-16&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.