← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-02-18 Sat | 25 | — | unknown | 19:35–20:50 (good, 1.25 h) | 89.6° 15:15 | 10.14 | 41% | 40.5° |
| 2040-02-19 Sun | 20 | — | unknown | 19:35–21:50 (marginal, 2.25 h) | 89.8° 15:10 | 10.1 | 50% | 46.4° |
| 2040-02-20 Mon | 17 | — | unknown | 19:35–21:40 (marginal, 2.08 h) | 89.8° 15:05 | 10.06 | 60% | 53.9° |
| 2040-02-21 Tue | 15 | — | unknown | 19:35–21:30 (marginal, 1.92 h) | 89.6° 15:00 | 10.02 | 69% | 62.3° |
| 2040-02-22 Wed | 15 | — | unknown | 19:35–21:25 (marginal, 1.83 h) | 89.5° 15:00 | 9.97 | 77% | 71.3° |
| 2040-02-23 Thu | 15 | — | unknown | 19:40–21:25 (marginal, 1.75 h) | 89.7° 14:55 | 9.93 | 84% | 80.6° |
| 2040-02-24 Fri | 16 | — | unknown | 19:40–21:25 (marginal, 1.75 h) | 89.8° 14:50 | 9.89 | 91% | 90.2° |
| 2040-02-25 Sat | 18 | — | unknown | 19:40–20:20 (good, 0.67 h) | 89.7° 14:45 | 9.84 | 96% | 99.9° |
| 2040-02-26 Sun | 21 | — | unknown | 19:40–20:30 (good, 0.83 h) | 89.6° 14:40 | 9.8 | 99% | 109.6° |
| 2040-02-27 Mon | 22 | — | unknown | 19:45–20:35 (good, 0.83 h) | 89.6° 14:40 | 9.75 | 100% | 119.1° |
| 2040-02-28 Tue | 22 | — | unknown | 19:45–20:30 (good, 0.75 h) | 89.7° 14:35 | 9.71 | 99% | 128.0° |
| 2040-02-29 Wed | 24 | — | unknown | 19:45–20:30 (good, 0.75 h) | 89.8° 14:30 | 9.66 | 96% | 135.7° |
| 2040-03-01 Thu | 24 | — | unknown | 19:45–20:35 (good, 0.83 h) | 89.7° 14:25 | 9.62 | 91% | 141.3° |
| 2040-03-02 Fri | 22 | — | unknown | 19:50–20:30 (good, 0.67 h) | 89.5° 14:20 | 9.57 | 84% | 143.5° |
| 2040-03-03 Sat | 21 | — | unknown | 19:50–20:25 (good, 0.58 h) | 89.6° 14:20 | 9.53 | 75% | 141.6° |
| 2040-03-04 Sun | 19 | — | unknown | 19:50–20:25 (good, 0.58 h) | 89.8° 14:15 | 9.48 | 65% | 135.9° |
| 2040-03-05 Mon | 17 | — | unknown | 19:50–20:20 (good, 0.5 h) | 89.8° 14:10 | 9.43 | 54% | 127.6° |
| 2040-03-06 Tue | 14 | — | unknown | 19:55–20:15 (good, 0.33 h) | 89.6° 14:05 | 9.39 | 43% | 117.7° |
| 2040-03-07 Wed | 13 | — | unknown | 19:55–20:10 (good, 0.25 h) | 89.5° 14:05 | 9.34 | 32% | 106.8° |
| 2040-03-08 Thu | 11 | — | unknown | 19:55–20:10 (good, 0.25 h) | 89.7° 14:00 | 9.29 | 22% | 95.4° |
| 2040-03-09 Fri | 10 | — | unknown | 19:55–20:05 (good, 0.17 h) | 89.8° 13:55 | 9.24 | 13% | 83.8° |
| 2040-03-10 Sat | 9 | — | unknown | 19:55–20:00 (good, 0.08 h) | 89.7° 13:50 | 9.19 | 6% | 72.4° |
| 2040-03-11 Sun | 7 | — | unknown | 20:00–20:30 (marginal, 0.5 h) | 89.6° 13:45 | 9.15 | 2% | 61.5° |
| 2040-03-12 Mon | 6 | — | unknown | 20:00–20:25 (marginal, 0.42 h) | 89.6° 13:45 | 9.1 | 0% | 51.6° |
| 2040-03-13 Tue | 5 | — | unknown | 20:00–20:20 (marginal, 0.33 h) | 89.7° 13:40 | 9.05 | 1% | 43.5° |
| 2040-03-14 Wed | 4 | — | unknown | 20:00–20:15 (marginal, 0.25 h) | 89.8° 13:35 | 9.0 | 4% | 38.1° |
| 2040-03-15 Thu | 3 | — | unknown | 20:05–20:15 (marginal, 0.17 h) | 89.7° 13:30 | 8.95 | 10% | 36.4° |
| 2040-03-16 Fri | 2 | — | unknown | 20:05–20:10 (marginal, 0.08 h) | 89.5° 13:25 | 8.9 | 16% | 38.6° |
| 2040-03-17 Sat | 1 | — | unknown | — | 89.6° 13:25 | 8.84 | 24% | 43.8° |
| 2040-03-18 Sun | 1 | — | unknown | — | 89.8° 13:20 | 8.79 | 33% | 50.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-02-18&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.