← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-01-17 Sun | 0 | — | unknown | — | 71.1° 12:35 | 11.19 | 72% | 97.6° |
| 2027-01-18 Mon | 0 | — | unknown | — | 71.1° 12:30 | 11.16 | 82% | 107.9° |
| 2027-01-19 Tue | 0 | — | unknown | — | 71.1° 12:30 | 11.14 | 90% | 117.8° |
| 2027-01-20 Wed | 0 | — | unknown | — | 71.1° 12:25 | 11.11 | 96% | 126.6° |
| 2027-01-21 Thu | 0 | — | unknown | — | 71.1° 12:20 | 11.09 | 100% | 133.4° |
| 2027-01-22 Fri | 0 | — | unknown | — | 71.1° 12:15 | 11.06 | 100% | 136.7° |
| 2027-01-23 Sat | 0 | — | unknown | — | 71.1° 12:15 | 11.04 | 97% | 136.0° |
| 2027-01-24 Sun | 0 | — | unknown | — | 71.1° 12:10 | 11.01 | 92% | 131.5° |
| 2027-01-25 Mon | 0 | — | unknown | — | 71.1° 12:05 | 10.98 | 84% | 124.5° |
| 2027-01-26 Tue | 0 | — | unknown | — | 71.1° 12:00 | 10.95 | 75% | 116.0° |
| 2027-01-27 Wed | 0 | — | unknown | — | 71.1° 11:55 | 10.92 | 65% | 107.0° |
| 2027-01-28 Thu | 1 | — | unknown | — | 71.1° 11:50 | 10.89 | 55% | 97.8° |
| 2027-01-29 Fri | 1 | — | unknown | — | 71.1° 11:45 | 10.86 | 45% | 88.7° |
| 2027-01-30 Sat | 1 | — | unknown | — | 71.1° 11:40 | 10.83 | 36% | 79.8° |
| 2027-01-31 Sun | 1 | — | unknown | — | 71.1° 11:35 | 10.8 | 27% | 71.2° |
| 2027-02-01 Mon | 1 | — | unknown | — | 71.1° 11:35 | 10.77 | 19% | 63.3° |
| 2027-02-02 Tue | 1 | — | unknown | — | 71.1° 11:30 | 10.73 | 12% | 56.1° |
| 2027-02-03 Wed | 2 | — | unknown | 05:55–06:00 (marginal, 0.08 h) | 71.1° 11:25 | 10.7 | 7% | 50.0° |
| 2027-02-04 Thu | 2 | — | unknown | 06:20–06:30 (marginal, 0.17 h) | 71.1° 11:20 | 10.66 | 3% | 45.5° |
| 2027-02-05 Fri | 3 | — | unknown | 06:15–06:30 (marginal, 0.25 h) | 71.1° 11:20 | 10.63 | 0% | 43.2° |
| 2027-02-06 Sat | 3 | — | unknown | 06:15–06:30 (marginal, 0.25 h) | 71.1° 11:15 | 10.59 | 0% | 43.5° |
| 2027-02-07 Sun | 4 | — | unknown | 05:40–05:55 (marginal, 0.25 h) | 71.1° 11:10 | 10.56 | 2% | 46.5° |
| 2027-02-08 Mon | 4 | — | unknown | 05:40–05:55 (marginal, 0.25 h) | 71.1° 11:05 | 10.52 | 5% | 51.6° |
| 2027-02-09 Tue | 5 | — | unknown | 06:00–06:25 (marginal, 0.42 h) | 71.1° 11:00 | 10.49 | 10% | 58.5° |
| 2027-02-10 Wed | 6 | — | unknown | 05:55–06:25 (marginal, 0.5 h) | 71.1° 11:00 | 10.45 | 17% | 66.5° |
| 2027-02-11 Thu | 6 | — | unknown | 05:25–05:50 (marginal, 0.42 h) | 71.1° 10:55 | 10.41 | 25% | 75.4° |
| 2027-02-12 Fri | 7 | — | unknown | 05:20–06:20 (marginal, 1.0 h) | 71.1° 10:50 | 10.37 | 35% | 84.9° |
| 2027-02-13 Sat | 7 | — | unknown | 05:20–06:20 (marginal, 1.0 h) | 71.1° 10:45 | 10.33 | 46% | 94.7° |
| 2027-02-14 Sun | 8 | — | unknown | 05:40–05:45 (good, 0.08 h) | 71.1° 10:40 | 10.3 | 57% | 104.6° |
| 2027-02-15 Mon | 9 | — | unknown | 05:35–05:45 (good, 0.17 h) | 71.1° 10:40 | 10.26 | 68% | 114.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-01-17&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.