← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-03-17 Mon | 33 | — | unknown | 03:35–05:00 (good, 1.42 h) | 87.3° 09:40 | 8.89 | 31% | 66.5° |
| 2031-03-18 Tue | 36 | — | unknown | 03:20–04:55 (good, 1.58 h) | 87.3° 09:35 | 8.84 | 21% | 60.1° |
| 2031-03-19 Wed | 41 | — | unknown | 03:15–04:55 (good, 1.67 h) | 87.3° 09:30 | 8.78 | 13% | 55.3° |
| 2031-03-20 Thu | 43 | — | unknown | 03:10–04:55 (good, 1.75 h) | 87.3° 09:25 | 8.73 | 6% | 52.7° |
| 2031-03-21 Fri | 43 | — | unknown | 03:10–04:50 (good, 1.67 h) | 87.3° 09:25 | 8.68 | 2% | 52.8° |
| 2031-03-22 Sat | 44 | — | unknown | 03:05–04:50 (good, 1.75 h) | 87.3° 09:20 | 8.63 | 0% | 55.3° |
| 2031-03-23 Sun | 44 | — | unknown | 03:00–04:45 (good, 1.75 h) | 87.3° 09:15 | 8.58 | 1% | 59.8° |
| 2031-03-24 Mon | 46 | — | unknown | 02:55–04:45 (good, 1.83 h) | 87.3° 09:10 | 8.52 | 4% | 65.7° |
| 2031-03-25 Tue | 47 | — | unknown | 02:50–04:45 (good, 1.92 h) | 87.3° 09:05 | 8.47 | 8% | 72.4° |
| 2031-03-26 Wed | 47 | — | unknown | 02:50–04:40 (good, 1.83 h) | 87.3° 09:05 | 8.42 | 15% | 79.7° |
| 2031-03-27 Thu | 48 | — | unknown | 02:45–04:40 (good, 1.92 h) | 87.3° 09:00 | 8.36 | 22% | 87.1° |
| 2031-03-28 Fri | 49 | — | unknown | 02:40–04:40 (good, 2.0 h) | 87.3° 08:55 | 8.31 | 31% | 94.4° |
| 2031-03-29 Sat | 50 | — | unknown | 02:35–05:35 (good, 2.0 h) | 87.3° 09:50 | 8.26 | 40% | 101.5° |
| 2031-03-30 Sun | 51 | — | unknown | 03:30–05:35 (good, 2.08 h) | 87.3° 09:45 | 8.2 | 49% | 108.3° |
| 2031-03-31 Mon | 50 | — | unknown | 03:30–05:30 (good, 2.0 h) | 87.3° 09:45 | 8.15 | 59% | 114.5° |
| 2031-04-01 Tue | 51 | — | unknown | 03:30–05:30 (good, 2.0 h) | 87.3° 09:40 | 8.09 | 68% | 119.9° |
| 2031-04-02 Wed | 51 | — | unknown | 03:30–05:30 (good, 2.0 h) | 87.3° 09:35 | 8.04 | 76% | 124.2° |
| 2031-04-03 Thu | 51 | — | unknown | 03:25–05:25 (good, 2.0 h) | 87.3° 09:30 | 7.98 | 84% | 126.9° |
| 2031-04-04 Fri | 51 | — | unknown | 03:25–05:25 (good, 2.0 h) | 87.3° 09:30 | 7.93 | 91% | 127.6° |
| 2031-04-05 Sat | 45 | — | unknown | 03:20–05:20 (good, 2.0 h) | 87.3° 09:25 | 7.87 | 96% | 126.1° |
| 2031-04-06 Sun | 46 | — | unknown | 03:20–05:20 (good, 2.0 h) | 87.3° 09:20 | 7.82 | 99% | 122.4° |
| 2031-04-07 Mon | 45 | — | unknown | 03:15–05:20 (good, 2.08 h) | 87.3° 09:15 | 7.76 | 100% | 116.8° |
| 2031-04-08 Tue | 41 | — | unknown | 03:20–05:15 (good, 1.92 h) | 87.3° 09:10 | 7.7 | 98% | 109.8° |
| 2031-04-09 Wed | 38 | — | unknown | 03:20–05:15 (good, 1.92 h) | 87.3° 09:10 | 7.65 | 94% | 101.7° |
| 2031-04-10 Thu | 36 | — | unknown | 03:15–05:10 (good, 1.92 h) | 87.3° 09:05 | 7.59 | 87% | 93.1° |
| 2031-04-11 Fri | 36 | — | unknown | 03:15–05:10 (good, 1.92 h) | 87.3° 09:00 | 7.53 | 78% | 84.4° |
| 2031-04-12 Sat | 38 | — | unknown | 03:05–05:10 (good, 2.08 h) | 87.3° 08:55 | 7.48 | 68% | 75.9° |
| 2031-04-13 Sun | 41 | — | unknown | 02:55–05:05 (good, 2.17 h) | 87.3° 08:50 | 7.42 | 57% | 68.0° |
| 2031-04-14 Mon | 46 | — | unknown | 02:35–05:05 (good, 2.5 h) | 87.3° 08:50 | 7.36 | 46% | 61.3° |
| 2031-04-15 Tue | 54 | — | unknown | 02:30–05:00 (good, 2.5 h) | 87.3° 08:45 | 7.31 | 34% | 56.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-03-17&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.