← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-01-10 Sat | 14 | 0 | 0 | — | 87.1° 11:35 | 11.32 | 47% | 89.1° |
| 2026-01-11 Sun | 16 | 0 | 0 | — | 87.1° 11:30 | 11.31 | 38% | 84.3° |
| 2026-01-12 Mon | 18 | 99 | 18 | 05:40–06:10 (good, 0.5 h) | 87.1° 11:25 | 11.29 | 29% | 79.7° |
| 2026-01-13 Tue | 20 | 13 | 3 | — | 87.1° 11:25 | 11.27 | 21% | 75.4° |
| 2026-01-14 Wed | 21 | 100 | 21 | 05:25–06:10 (good, 0.75 h) | 87.1° 11:20 | 11.25 | 14% | 71.8° |
| 2026-01-15 Thu | 24 | 72 | 17 | 06:00–06:10 (good, 0.17 h) | 87.1° 11:15 | 11.23 | 8% | 68.8° |
| 2026-01-16 Fri | 25 | 0 | 0 | — | 87.1° 11:10 | 11.2 | 4% | 66.8° |
| 2026-01-17 Sat | 26 | 0 | 0 | — | 87.1° 11:10 | 11.18 | 1% | 65.8° |
| 2026-01-18 Sun | 27 | 0 | 0 | — | 87.1° 11:05 | 11.16 | 0% | 66.0° |
| 2026-01-19 Mon | 29 | 100 | 29 | 05:05–06:10 (good, 1.08 h) | 87.1° 11:00 | 11.13 | 1% | 67.4° |
| 2026-01-20 Tue | 30 | 0 | 0 | — | 87.1° 10:55 | 11.11 | 5% | 70.0° |
| 2026-01-21 Wed | 31 | 0 | 0 | — | 87.1° 10:50 | 11.08 | 10% | 73.6° |
| 2026-01-22 Thu | 32 | 0 | 0 | — | 87.1° 10:50 | 11.06 | 17% | 78.1° |
| 2026-01-23 Fri | 33 | 26 | 9 | 04:50–05:00 (marginal, 0.17 h) | 87.1° 10:45 | 11.03 | 26% | 83.2° |
| 2026-01-24 Sat | 34 | 0 | 0 | — | 87.1° 10:40 | 11.0 | 36% | 88.7° |
| 2026-01-25 Sun | 36 | 0 | 0 | — | 87.1° 10:35 | 10.97 | 47% | 94.4° |
| 2026-01-26 Mon | 37 | 0 | 0 | — | 87.1° 10:30 | 10.94 | 58% | 99.9° |
| 2026-01-27 Tue | 38 | 21 | 8 | 06:00–06:05 (marginal, 0.08 h) | 87.1° 10:30 | 10.91 | 69% | 105.0° |
| 2026-01-28 Wed | 39 | 0 | 0 | — | 87.1° 10:25 | 10.88 | 80% | 109.3° |
| 2026-01-29 Thu | 37 | 0 | 0 | — | 87.1° 10:20 | 10.85 | 88% | 112.4° |
| 2026-01-30 Fri | 33 | 0 | 0 | — | 87.1° 10:15 | 10.82 | 95% | 114.0° |
| 2026-01-31 Sat | 33 | 0 | 0 | — | 87.1° 10:15 | 10.79 | 99% | 114.1° |
| 2026-02-01 Sun | 31 | 0 | 0 | — | 87.1° 10:10 | 10.76 | 100% | 112.5° |
| 2026-02-02 Mon | 31 | 0 | 0 | — | 87.1° 10:05 | 10.72 | 99% | 109.6° |
| 2026-02-03 Tue | 30 | 0 | 0 | — | 87.1° 10:00 | 10.69 | 95% | 105.7° |
| 2026-02-04 Wed | 30 | 0 | 0 | — | 87.1° 09:55 | 10.66 | 89% | 101.1° |
| 2026-02-05 Thu | 30 | 0 | 0 | — | 87.1° 09:55 | 10.62 | 82% | 96.1° |
| 2026-02-06 Fri | 31 | 0 | 0 | — | 87.1° 09:50 | 10.59 | 74% | 91.0° |
| 2026-02-07 Sat | 33 | 0 | 0 | — | 87.1° 09:45 | 10.55 | 65% | 86.0° |
| 2026-02-08 Sun | 36 | 0 | 0 | — | 87.1° 09:40 | 10.51 | 56% | 81.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-01-10&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.