← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-06-18 Thu | 0 | 0 | 0 | — | 72.5° 11:20 | 4.43 | 20% | 80.8° |
| 2026-06-19 Fri | 0 | 0 | 0 | — | 72.5° 11:15 | 4.42 | 30% | 94.7° |
| 2026-06-20 Sat | 0 | 0 | 0 | — | 72.5° 11:10 | 4.42 | 40% | 108.1° |
| 2026-06-21 Sun | 0 | 0 | 0 | — | 72.5° 11:05 | 4.42 | 50% | 121.1° |
| 2026-06-22 Mon | 0 | 0 | 0 | — | 72.5° 11:05 | 4.42 | 60% | 133.7° |
| 2026-06-23 Tue | 0 | 0 | 0 | — | 72.5° 11:00 | 4.43 | 70% | 146.1° |
| 2026-06-24 Wed | 0 | 0 | 0 | — | 72.5° 10:55 | 4.43 | 78% | 158.2° |
| 2026-06-25 Thu | 0 | 0 | 0 | — | 72.5° 10:50 | 4.44 | 86% | 170.2° |
| 2026-06-26 Fri | 0 | 0 | 0 | — | 72.5° 10:45 | 4.45 | 92% | 177.7° |
| 2026-06-27 Sat | 0 | 0 | 0 | — | 72.5° 10:45 | 4.47 | 96% | 166.1° |
| 2026-06-28 Sun | 0 | 100 | 0 | — | 72.5° 10:40 | 4.48 | 99% | 154.2° |
| 2026-06-29 Mon | 0 | 96 | 0 | — | 72.5° 10:35 | 4.5 | 100% | 142.4° |
| 2026-06-30 Tue | 0 | 80 | 0 | — | 72.5° 10:30 | 4.52 | 99% | 130.5° |
| 2026-07-01 Wed | 0 | 33 | 0 | — | 72.5° 10:30 | 4.54 | 96% | 118.4° |
| 2026-07-02 Thu | 0 | 86 | 0 | — | 72.5° 10:25 | 4.56 | 92% | 106.3° |
| 2026-07-03 Fri | 0 | 61 | 0 | — | 72.5° 10:20 | 4.58 | 86% | 94.0° |
| 2026-07-04 Sat | 0 | 94 | 0 | — | 72.5° 10:15 | 4.61 | 78% | 81.5° |
| 2026-07-05 Sun | 0 | 96 | 0 | — | 72.5° 10:10 | 4.64 | 70% | 68.7° |
| 2026-07-06 Mon | 0 | 95 | 0 | — | 72.5° 10:10 | 4.67 | 59% | 55.7° |
| 2026-07-07 Tue | 0 | 99 | 0 | — | 72.5° 10:05 | 4.7 | 49% | 42.3° |
| 2026-07-08 Wed | 0 | 0 | 0 | — | 72.5° 10:00 | 4.73 | 38% | 28.6° |
| 2026-07-09 Thu | 1 | 96 | 1 | — | 72.5° 09:55 | 4.76 | 27% | 14.4° |
| 2026-07-10 Fri | 1 | 100 | 1 | — | 72.5° 09:50 | 4.8 | 17% | 1.0° |
| 2026-07-11 Sat | 1 | 100 | 1 | — | 72.5° 09:50 | 4.84 | 9% | 14.9° |
| 2026-07-12 Sun | 2 | 99 | 2 | 04:40–04:45 (marginal, 0.08 h) | 72.5° 09:45 | 4.87 | 3% | 30.0° |
| 2026-07-13 Mon | 2 | 92 | 2 | — | 72.5° 09:40 | 4.91 | 0% | 45.0° |
| 2026-07-14 Tue | 2 | 99 | 2 | 04:30–04:45 (marginal, 0.25 h) | 72.5° 09:35 | 4.96 | 0% | 60.0° |
| 2026-07-15 Wed | 3 | 94 | 3 | 04:30–04:50 (marginal, 0.33 h) | 72.5° 09:35 | 5.0 | 3% | 74.8° |
| 2026-07-16 Thu | 4 | 83 | 3 | 04:30–04:50 (marginal, 0.33 h) | 72.5° 09:30 | 5.04 | 9% | 89.2° |
| 2026-07-17 Fri | 5 | 99 | 5 | 04:20–04:50 (marginal, 0.5 h) | 72.5° 09:25 | 5.08 | 16% | 103.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-06-18&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.