← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-02-27 Mon | 26 | — | unknown | 19:45–20:50 (good, 1.08 h) | 79.2° 15:30 | 9.75 | 100% | 120.2° |
| 2040-02-28 Tue | 26 | — | unknown | 19:45–20:45 (good, 1.0 h) | 79.2° 15:25 | 9.71 | 99% | 131.5° |
| 2040-02-29 Wed | 28 | — | unknown | 19:45–20:45 (good, 1.0 h) | 79.2° 15:20 | 9.66 | 96% | 142.3° |
| 2040-03-01 Thu | 29 | — | unknown | 19:45–20:50 (good, 1.08 h) | 79.2° 15:15 | 9.62 | 91% | 151.6° |
| 2040-03-02 Fri | 26 | — | unknown | 19:50–20:45 (good, 0.92 h) | 79.2° 15:15 | 9.57 | 84% | 157.4° |
| 2040-03-03 Sat | 25 | — | unknown | 19:50–20:40 (good, 0.83 h) | 79.2° 15:10 | 9.53 | 75% | 156.3° |
| 2040-03-04 Sun | 23 | — | unknown | 19:50–20:40 (good, 0.83 h) | 79.2° 15:05 | 9.48 | 65% | 148.9° |
| 2040-03-05 Mon | 22 | — | unknown | 19:50–20:35 (good, 0.75 h) | 79.2° 15:00 | 9.43 | 54% | 138.2° |
| 2040-03-06 Tue | 20 | — | unknown | 19:55–20:30 (good, 0.58 h) | 79.2° 15:00 | 9.39 | 43% | 126.1° |
| 2040-03-07 Wed | 18 | — | unknown | 19:55–20:25 (good, 0.5 h) | 79.2° 14:55 | 9.34 | 32% | 113.3° |
| 2040-03-08 Thu | 16 | — | unknown | 19:55–20:20 (good, 0.42 h) | 79.2° 14:50 | 9.29 | 22% | 100.2° |
| 2040-03-09 Fri | 14 | — | unknown | 19:55–20:20 (good, 0.42 h) | 79.2° 14:45 | 9.24 | 13% | 86.8° |
| 2040-03-10 Sat | 13 | — | unknown | 19:55–20:15 (good, 0.33 h) | 79.2° 14:40 | 9.19 | 6% | 73.5° |
| 2040-03-11 Sun | 11 | — | unknown | 20:00–20:10 (good, 0.17 h) | 79.2° 14:40 | 9.15 | 2% | 60.4° |
| 2040-03-12 Mon | 9 | — | unknown | 20:00–20:05 (good, 0.08 h) | 79.2° 14:35 | 9.1 | 0% | 48.0° |
| 2040-03-13 Tue | 8 | — | unknown | 20:00–20:05 (good, 0.08 h) | 79.2° 14:30 | 9.05 | 1% | 36.5° |
| 2040-03-14 Wed | 6 | — | unknown | 20:00–20:25 (marginal, 0.42 h) | 79.2° 14:25 | 9.0 | 4% | 27.2° |
| 2040-03-15 Thu | 5 | — | unknown | 20:05–20:25 (marginal, 0.33 h) | 79.2° 14:20 | 8.95 | 10% | 22.3° |
| 2040-03-16 Fri | 4 | — | unknown | 20:05–20:20 (marginal, 0.25 h) | 79.2° 14:20 | 8.9 | 16% | 24.0° |
| 2040-03-17 Sat | 2 | — | unknown | 20:05–20:15 (marginal, 0.17 h) | 79.2° 14:15 | 8.84 | 24% | 30.8° |
| 2040-03-18 Sun | 2 | — | unknown | 20:05–20:10 (marginal, 0.08 h) | 79.2° 14:10 | 8.79 | 33% | 40.0° |
| 2040-03-19 Mon | 1 | — | unknown | — | 79.2° 14:05 | 8.74 | 42% | 50.2° |
| 2040-03-20 Tue | 1 | — | unknown | — | 79.2° 14:05 | 8.69 | 52% | 60.7° |
| 2040-03-21 Wed | 0 | — | unknown | — | 79.2° 14:00 | 8.64 | 61% | 71.5° |
| 2040-03-22 Thu | 0 | — | unknown | — | 79.2° 13:55 | 8.59 | 70% | 82.5° |
| 2040-03-23 Fri | 0 | — | unknown | — | 79.2° 13:50 | 8.53 | 78% | 93.6° |
| 2040-03-24 Sat | 0 | — | unknown | — | 79.2° 13:45 | 8.48 | 86% | 104.9° |
| 2040-03-25 Sun | 0 | — | unknown | — | 79.2° 14:45 | 8.43 | 92% | 116.3° |
| 2040-03-26 Mon | 0 | — | unknown | — | 79.2° 14:40 | 8.37 | 97% | 127.7° |
| 2040-03-27 Tue | 0 | — | unknown | — | 79.2° 14:35 | 8.32 | 99% | 138.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-02-27&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.