← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-02-21 Thu | 38 | — | unknown | 19:35–21:10 (good, 1.58 h) | 89.7° 15:00 | 9.98 | 71% | 144.3° |
| 2041-02-22 Fri | 36 | — | unknown | 19:40–21:05 (good, 1.42 h) | 89.8° 14:55 | 9.94 | 61% | 140.1° |
| 2041-02-23 Sat | 35 | — | unknown | 19:40–21:00 (good, 1.33 h) | 89.7° 14:50 | 9.9 | 51% | 133.0° |
| 2041-02-24 Sun | 33 | — | unknown | 19:40–20:55 (good, 1.25 h) | 89.6° 14:45 | 9.85 | 40% | 123.9° |
| 2041-02-25 Mon | 31 | — | unknown | 19:40–20:50 (good, 1.17 h) | 89.6° 14:45 | 9.81 | 29% | 113.3° |
| 2041-02-26 Tue | 29 | — | unknown | 19:45–20:50 (good, 1.08 h) | 89.7° 14:40 | 9.77 | 20% | 101.9° |
| 2041-02-27 Wed | 27 | — | unknown | 19:45–20:45 (good, 1.0 h) | 89.8° 14:35 | 9.72 | 11% | 89.8° |
| 2041-02-28 Thu | 26 | — | unknown | 19:45–20:40 (good, 0.92 h) | 89.7° 14:30 | 9.68 | 5% | 77.5° |
| 2041-03-01 Fri | 25 | — | unknown | 19:45–20:35 (good, 0.83 h) | 89.5° 14:25 | 9.63 | 1% | 65.5° |
| 2041-03-02 Sat | 22 | — | unknown | 19:50–20:30 (good, 0.67 h) | 89.6° 14:25 | 9.58 | 0% | 54.1° |
| 2041-03-03 Sun | 21 | — | unknown | 19:50–20:30 (good, 0.67 h) | 89.8° 14:20 | 9.54 | 3% | 44.4° |
| 2041-03-04 Mon | 18 | — | unknown | 19:50–20:20 (good, 0.5 h) | 89.8° 14:15 | 9.49 | 8% | 37.5° |
| 2041-03-05 Tue | 15 | — | unknown | 19:50–20:15 (good, 0.42 h) | 89.6° 14:10 | 9.45 | 15% | 34.9° |
| 2041-03-06 Wed | 12 | — | unknown | 19:50–20:00 (good, 0.17 h) | 89.5° 14:10 | 9.4 | 23% | 37.0° |
| 2041-03-07 Thu | 8 | — | unknown | 19:55–20:45 (marginal, 0.83 h) | 89.7° 14:05 | 9.35 | 33% | 42.8° |
| 2041-03-08 Fri | 6 | — | unknown | 19:55–20:40 (marginal, 0.75 h) | 89.8° 14:00 | 9.3 | 43% | 50.6° |
| 2041-03-09 Sat | 5 | — | unknown | 19:55–20:35 (marginal, 0.67 h) | 89.7° 13:55 | 9.25 | 53% | 59.5° |
| 2041-03-10 Sun | 4 | — | unknown | 19:55–20:25 (marginal, 0.5 h) | 89.6° 13:50 | 9.21 | 62% | 69.0° |
| 2041-03-11 Mon | 3 | — | unknown | 20:00–20:25 (marginal, 0.42 h) | 89.6° 13:50 | 9.16 | 71% | 78.6° |
| 2041-03-12 Tue | 3 | — | unknown | 20:00–20:20 (marginal, 0.33 h) | 89.7° 13:45 | 9.11 | 80% | 88.3° |
| 2041-03-13 Wed | 3 | — | unknown | 20:00–20:20 (marginal, 0.33 h) | 89.8° 13:40 | 9.06 | 86% | 98.0° |
| 2041-03-14 Thu | 3 | — | unknown | 20:00–20:20 (marginal, 0.33 h) | 89.7° 13:35 | 9.01 | 92% | 107.5° |
| 2041-03-15 Fri | 2 | — | unknown | 20:05–20:15 (marginal, 0.17 h) | 89.5° 13:30 | 8.96 | 96% | 116.8° |
| 2041-03-16 Sat | 2 | — | unknown | 20:05–20:10 (marginal, 0.08 h) | 89.6° 13:30 | 8.91 | 99% | 125.7° |
| 2041-03-17 Sun | 1 | — | unknown | — | 89.8° 13:25 | 8.86 | 100% | 133.8° |
| 2041-03-18 Mon | 1 | — | unknown | — | 89.8° 13:20 | 8.81 | 99% | 140.3° |
| 2041-03-19 Tue | 1 | — | unknown | — | 89.7° 13:15 | 8.75 | 96% | 144.4° |
| 2041-03-20 Wed | 1 | — | unknown | — | 89.5° 13:15 | 8.7 | 91% | 144.9° |
| 2041-03-21 Thu | 1 | — | unknown | — | 89.7° 13:10 | 8.65 | 84% | 141.6° |
| 2041-03-22 Fri | 0 | — | unknown | — | 89.8° 13:05 | 8.6 | 76% | 135.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-02-21&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.