← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-01-13 Tue | 100 | 7 | 7 | 23:00–23:40 (marginal, 0.67 h) | 79.1° 18:25 | 11.27 | 21% | 150.7° |
| 2026-01-14 Wed | 100 | 99 | 99 | 18:55–23:50 (good, 4.92 h) | 79.1° 18:20 | 11.25 | 14% | 140.3° |
| 2026-01-15 Thu | 100 | 87 | 87 | 18:55–23:00 (good, 4.08 h) | 79.1° 18:15 | 11.23 | 8% | 129.2° |
| 2026-01-16 Fri | 100 | 0 | 0 | — | 79.1° 18:10 | 11.2 | 4% | 117.7° |
| 2026-01-17 Sat | 100 | 88 | 88 | 19:00–23:35 (good, 4.58 h) | 79.1° 18:10 | 11.18 | 1% | 106.0° |
| 2026-01-18 Sun | 100 | 0 | 0 | — | 79.1° 18:05 | 11.16 | 0% | 94.0° |
| 2026-01-19 Mon | 100 | 92 | 92 | 19:00–23:30 (good, 4.5 h) | 79.1° 18:00 | 11.13 | 1% | 81.8° |
| 2026-01-20 Tue | 100 | 81 | 81 | 19:00–22:45 (good, 3.75 h) | 79.1° 17:55 | 11.11 | 5% | 69.5° |
| 2026-01-21 Wed | 100 | 0 | 0 | — | 79.1° 17:50 | 11.08 | 10% | 57.0° |
| 2026-01-22 Thu | 93 | 0 | 0 | — | 79.1° 17:50 | 11.06 | 17% | 44.6° |
| 2026-01-23 Fri | 83 | 53 | 44 | 19:05–21:00 (good, 1.92 h) | 79.1° 17:45 | 11.03 | 26% | 32.4° |
| 2026-01-24 Sat | 65 | 9 | 6 | — | 79.1° 17:40 | 11.0 | 36% | 21.4° |
| 2026-01-25 Sun | 49 | 0 | 0 | — | 79.1° 17:35 | 10.97 | 47% | 15.2° |
| 2026-01-26 Mon | 34 | 0 | 0 | — | 79.1° 17:35 | 10.94 | 58% | 19.6° |
| 2026-01-27 Tue | 22 | 16 | 4 | — | 79.1° 17:30 | 10.91 | 69% | 30.5° |
| 2026-01-28 Wed | 21 | 0 | 0 | — | 79.1° 17:25 | 10.88 | 80% | 43.5° |
| 2026-01-29 Thu | 24 | 0 | 0 | — | 79.1° 17:20 | 10.85 | 88% | 57.1° |
| 2026-01-30 Fri | 31 | 0 | 0 | — | 79.1° 17:15 | 10.82 | 95% | 71.0° |
| 2026-01-31 Sat | 41 | 0 | 0 | — | 79.1° 17:15 | 10.79 | 99% | 84.9° |
| 2026-02-01 Sun | 54 | 0 | 0 | — | 79.1° 17:10 | 10.76 | 100% | 98.7° |
| 2026-02-02 Mon | 66 | 0 | 0 | — | 79.1° 17:05 | 10.72 | 99% | 112.2° |
| 2026-02-03 Tue | 80 | 10 | 8 | 18:45–19:00 (marginal, 0.25 h) | 79.1° 17:00 | 10.69 | 95% | 125.2° |
| 2026-02-04 Wed | 81 | 0 | 0 | — | 79.1° 16:55 | 10.66 | 89% | 137.7° |
| 2026-02-05 Thu | 80 | 0 | 0 | — | 79.1° 16:55 | 10.62 | 82% | 149.2° |
| 2026-02-06 Fri | 79 | 0 | 0 | — | 79.1° 16:50 | 10.59 | 74% | 159.1° |
| 2026-02-07 Sat | 76 | 90 | 69 | 19:20–22:10 (good, 2.83 h) | 79.1° 16:45 | 10.55 | 65% | 164.7° |
| 2026-02-08 Sun | 74 | 38 | 28 | 19:20–20:00 (good, 0.67 h) | 79.1° 16:40 | 10.51 | 56% | 162.1° |
| 2026-02-09 Mon | 71 | 0 | 0 | — | 79.1° 16:40 | 10.48 | 46% | 153.9° |
| 2026-02-10 Tue | 69 | 0 | 0 | — | 79.1° 16:35 | 10.44 | 37% | 143.8° |
| 2026-02-11 Wed | 66 | 0 | 0 | — | 79.1° 16:30 | 10.4 | 28% | 132.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-01-13&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.