← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-01-12 Mon | 35 | 88 | 31 | 19:00–20:15 (good, 1.25 h) | 87.2° 13:55 | 11.29 | 29% | 105.6° |
| 2026-01-13 Tue | 34 | 0 | 0 | — | 87.3° 13:50 | 11.27 | 21% | 99.6° |
| 2026-01-14 Wed | 32 | 98 | 31 | 18:55–20:05 (good, 1.17 h) | 87.3° 13:45 | 11.25 | 14% | 93.3° |
| 2026-01-15 Thu | 30 | 100 | 30 | 18:55–20:00 (good, 1.08 h) | 87.3° 13:40 | 11.23 | 8% | 86.9° |
| 2026-01-16 Fri | 29 | 0 | 0 | — | 87.2° 13:35 | 11.2 | 4% | 80.4° |
| 2026-01-17 Sat | 27 | 85 | 23 | 19:00–19:40 (good, 0.67 h) | 87.2° 13:35 | 11.18 | 1% | 74.2° |
| 2026-01-18 Sun | 26 | 0 | 0 | — | 87.3° 13:30 | 11.16 | 0% | 68.5° |
| 2026-01-19 Mon | 25 | 96 | 24 | 19:00–19:45 (good, 0.75 h) | 87.3° 13:25 | 11.13 | 1% | 63.6° |
| 2026-01-20 Tue | 23 | 91 | 21 | 19:00–19:40 (good, 0.67 h) | 87.2° 13:20 | 11.11 | 5% | 59.8° |
| 2026-01-21 Wed | 21 | 0 | 0 | — | 87.2° 13:15 | 11.08 | 10% | 57.6° |
| 2026-01-22 Thu | 18 | 1 | 0 | — | 87.2° 13:15 | 11.06 | 17% | 57.2° |
| 2026-01-23 Fri | 15 | 84 | 13 | 19:05–19:15 (good, 0.17 h) | 87.3° 13:10 | 11.03 | 26% | 58.9° |
| 2026-01-24 Sat | 12 | 0 | 0 | — | 87.3° 13:05 | 11.0 | 36% | 62.4° |
| 2026-01-25 Sun | 10 | 0 | 0 | — | 87.2° 13:00 | 10.97 | 47% | 67.5° |
| 2026-01-26 Mon | 8 | 0 | 0 | — | 87.2° 13:00 | 10.94 | 58% | 73.9° |
| 2026-01-27 Tue | 7 | 31 | 2 | — | 87.3° 12:55 | 10.91 | 69% | 81.1° |
| 2026-01-28 Wed | 7 | 0 | 0 | — | 87.3° 12:50 | 10.88 | 80% | 88.9° |
| 2026-01-29 Thu | 7 | 0 | 0 | — | 87.3° 12:45 | 10.85 | 88% | 96.7° |
| 2026-01-30 Fri | 6 | 0 | 0 | — | 87.2° 12:40 | 10.82 | 95% | 104.3° |
| 2026-01-31 Sat | 6 | 0 | 0 | — | 87.2° 12:40 | 10.79 | 99% | 111.1° |
| 2026-02-01 Sun | 7 | 0 | 0 | — | 87.3° 12:35 | 10.76 | 100% | 116.7° |
| 2026-02-02 Mon | 7 | 0 | 0 | — | 87.3° 12:30 | 10.72 | 99% | 120.6° |
| 2026-02-03 Tue | 8 | 18 | 1 | — | 87.3° 12:25 | 10.69 | 95% | 122.7° |
| 2026-02-04 Wed | 7 | 0 | 0 | — | 87.2° 12:20 | 10.66 | 89% | 122.7° |
| 2026-02-05 Thu | 8 | 0 | 0 | — | 87.2° 12:20 | 10.62 | 82% | 120.8° |
| 2026-02-06 Fri | 8 | 0 | 0 | — | 87.3° 12:15 | 10.59 | 74% | 117.4° |
| 2026-02-07 Sat | 9 | 14 | 1 | — | 87.3° 12:10 | 10.55 | 65% | 112.9° |
| 2026-02-08 Sun | 9 | 11 | 1 | — | 87.2° 12:05 | 10.51 | 56% | 107.6° |
| 2026-02-09 Mon | 9 | 0 | 0 | — | 87.3° 12:00 | 10.48 | 46% | 101.7° |
| 2026-02-10 Tue | 10 | 0 | 0 | — | 87.3° 11:55 | 10.44 | 37% | 95.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-01-12&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.