← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-01-19 Sun | 0 | — | unknown | — | 71.1° 12:30 | 11.14 | 15% | 63.9° |
| 2031-01-20 Mon | 0 | — | unknown | — | 71.1° 12:25 | 11.11 | 7% | 53.5° |
| 2031-01-21 Tue | 0 | — | unknown | — | 71.1° 12:20 | 11.09 | 2% | 44.7° |
| 2031-01-22 Wed | 0 | — | unknown | — | 71.1° 12:15 | 11.06 | 0% | 39.0° |
| 2031-01-23 Thu | 0 | — | unknown | — | 71.1° 12:15 | 11.03 | 1% | 37.7° |
| 2031-01-24 Fri | 0 | — | unknown | — | 71.1° 12:10 | 11.01 | 4% | 41.2° |
| 2031-01-25 Sat | 0 | — | unknown | — | 71.1° 12:05 | 10.98 | 10% | 48.0° |
| 2031-01-26 Sun | 0 | — | unknown | — | 71.1° 12:00 | 10.95 | 18% | 56.7° |
| 2031-01-27 Mon | 1 | — | unknown | — | 71.1° 11:55 | 10.92 | 27% | 66.3° |
| 2031-01-28 Tue | 1 | — | unknown | — | 71.1° 11:50 | 10.89 | 36% | 76.1° |
| 2031-01-29 Wed | 1 | — | unknown | — | 71.1° 11:45 | 10.86 | 46% | 85.9° |
| 2031-01-30 Thu | 1 | — | unknown | — | 71.1° 11:40 | 10.83 | 56% | 95.6° |
| 2031-01-31 Fri | 1 | — | unknown | — | 71.1° 11:40 | 10.8 | 65% | 105.0° |
| 2031-02-01 Sat | 1 | — | unknown | — | 71.1° 11:35 | 10.76 | 74% | 114.0° |
| 2031-02-02 Sun | 1 | — | unknown | — | 71.1° 11:30 | 10.73 | 82% | 122.5° |
| 2031-02-03 Mon | 2 | — | unknown | 05:55–06:00 (marginal, 0.08 h) | 71.1° 11:25 | 10.7 | 88% | 130.2° |
| 2031-02-04 Tue | 2 | — | unknown | 06:20–06:30 (marginal, 0.17 h) | 71.1° 11:20 | 10.66 | 94% | 136.6° |
| 2031-02-05 Wed | 2 | — | unknown | 05:50–05:55 (marginal, 0.08 h) | 71.1° 11:20 | 10.63 | 97% | 140.9° |
| 2031-02-06 Thu | 3 | — | unknown | 05:45–05:55 (marginal, 0.17 h) | 71.1° 11:15 | 10.59 | 100% | 142.4° |
| 2031-02-07 Fri | 3 | — | unknown | 05:40–05:55 (marginal, 0.25 h) | 71.1° 11:10 | 10.56 | 100% | 140.5° |
| 2031-02-08 Sat | 4 | — | unknown | 05:40–05:55 (marginal, 0.25 h) | 71.1° 11:05 | 10.52 | 98% | 135.5° |
| 2031-02-09 Sun | 4 | — | unknown | 05:35–05:50 (marginal, 0.25 h) | 71.1° 11:00 | 10.48 | 94% | 128.3° |
| 2031-02-10 Mon | 4 | — | unknown | 05:30–05:50 (marginal, 0.33 h) | 71.1° 11:00 | 10.45 | 88% | 119.6° |
| 2031-02-11 Tue | 5 | — | unknown | 05:25–05:50 (marginal, 0.42 h) | 71.1° 10:55 | 10.41 | 81% | 109.8° |
| 2031-02-12 Wed | 5 | — | unknown | 05:20–05:50 (marginal, 0.5 h) | 71.1° 10:50 | 10.37 | 72% | 99.5° |
| 2031-02-13 Thu | 5 | — | unknown | 05:20–05:45 (marginal, 0.42 h) | 71.1° 10:45 | 10.33 | 61% | 88.8° |
| 2031-02-14 Fri | 6 | — | unknown | 05:15–05:45 (marginal, 0.5 h) | 71.1° 10:40 | 10.29 | 50% | 77.9° |
| 2031-02-15 Sat | 7 | — | unknown | 05:10–05:45 (marginal, 0.58 h) | 71.1° 10:40 | 10.25 | 39% | 67.1° |
| 2031-02-16 Sun | 8 | — | unknown | 05:05–06:15 (marginal, 1.17 h) | 71.1° 10:35 | 10.21 | 28% | 56.8° |
| 2031-02-17 Mon | 9 | — | unknown | 05:35–05:40 (good, 0.08 h) | 71.1° 10:30 | 10.17 | 18% | 47.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-01-19&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.