← 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. |
|---|---|---|---|---|---|---|---|---|
| 2037-04-25 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° |
| 2037-05-16 Sat | 5 | — | unknown | 04:20–04:50 (marginal, 0.5 h) | 89.8° 10:25 | 5.51 | 3% | 59.1° |
| 2037-05-17 Sun | 6 | — | unknown | 04:15–04:50 (marginal, 0.58 h) | 89.8° 10:20 | 5.46 | 8% | 68.7° |
| 2037-05-18 Mon | 7 | — | unknown | 04:15–04:50 (marginal, 0.58 h) | 89.6° 10:15 | 5.4 | 15% | 79.0° |
| 2037-05-19 Tue | 7 | — | unknown | 04:10–04:45 (marginal, 0.58 h) | 89.5° 10:15 | 5.35 | 24% | 89.8° |
| 2037-05-20 Wed | 8 | — | unknown | 04:05–04:45 (marginal, 0.67 h) | 89.7° 10:10 | 5.3 | 34% | 100.6° |
| 2037-05-21 Thu | 9 | — | unknown | 03:30–04:45 (marginal, 1.25 h) | 89.8° 10:05 | 5.25 | 45% | 111.3° |
| 2037-05-22 Fri | 9 | — | unknown | 03:25–04:45 (marginal, 1.33 h) | 89.7° 10:00 | 5.21 | 56% | 121.5° |
| 2037-05-23 Sat | 10 | — | unknown | 03:20–04:40 (marginal, 1.33 h) | 89.6° 09:55 | 5.16 | 68% | 130.5° |
| 2037-05-24 Sun | 11 | — | unknown | 03:50–03:55 (good, 0.08 h) | 89.6° 09:55 | 5.11 | 78% | 137.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-04-25&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.