← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-07-21 Tue | 0 | 17 | 0 | — | 50.2° 17:55 | 5.27 | 55% | 30.1° |
| 2026-07-22 Wed | 0 | 78 | 0 | — | 50.2° 17:50 | 5.32 | 64% | 41.9° |
| 2026-07-23 Thu | 0 | 0 | 0 | — | 50.2° 17:45 | 5.37 | 73% | 53.7° |
| 2026-07-24 Fri | 0 | 0 | 0 | — | 50.2° 17:40 | 5.42 | 81% | 65.4° |
| 2026-07-25 Sat | 0 | 92 | 0 | — | 50.2° 17:40 | 5.47 | 88% | 77.1° |
| 2026-07-26 Sun | 0 | 94 | 0 | — | 50.2° 17:35 | 5.52 | 93% | 88.8° |
| 2026-07-27 Mon | 0 | 97 | 0 | — | 50.2° 17:30 | 5.58 | 97% | 100.6° |
| 2026-07-28 Tue | 0 | 90 | 0 | — | 50.2° 17:25 | 5.63 | 100% | 112.6° |
| 2026-07-29 Wed | 0 | 91 | 0 | — | 50.2° 17:25 | 5.68 | 100% | 124.6° |
| 2026-07-30 Thu | 0 | 100 | 0 | — | 50.2° 17:20 | 5.74 | 98% | 136.8° |
| 2026-07-31 Fri | 0 | 98 | 0 | — | 50.2° 17:15 | 5.79 | 95% | 149.0° |
| 2026-08-01 Sat | 0 | 100 | 0 | — | 50.2° 17:10 | 5.85 | 89% | 161.1° |
| 2026-08-02 Sun | 0 | 94 | 0 | — | 50.2° 17:05 | 5.9 | 82% | 171.0° |
| 2026-08-03 Mon | 0 | 98 | 0 | — | 50.2° 17:05 | 5.96 | 73% | 168.2° |
| 2026-08-04 Tue | 0 | 92 | 0 | — | 50.2° 17:00 | 6.01 | 63% | 156.4° |
| 2026-08-05 Wed | 0 | 62 | 0 | — | 50.2° 16:55 | 6.07 | 52% | 143.2° |
| 2026-08-06 Thu | 0 | 90 | 0 | — | 50.2° 16:50 | 6.13 | 40% | 129.5° |
| 2026-08-07 Fri | 0 | 0 | 0 | — | 50.2° 16:45 | 6.18 | 30% | 115.4° |
| 2026-08-08 Sat | 0 | 0 | 0 | — | 50.2° 16:45 | 6.24 | 19% | 101.1° |
| 2026-08-09 Sun | 0 | 0 | 0 | — | 50.2° 16:40 | 6.3 | 11% | 86.5° |
| 2026-08-10 Mon | 0 | 0 | 0 | — | 50.2° 16:35 | 6.35 | 5% | 71.9° |
| 2026-08-11 Tue | 0 | 0 | 0 | — | 50.2° 16:30 | 6.41 | 1% | 57.4° |
| 2026-08-12 Wed | 0 | 0 | 0 | — | 50.2° 16:25 | 6.47 | 0% | 43.1° |
| 2026-08-13 Thu | 0 | 0 | 0 | — | 50.2° 16:25 | 6.53 | 2% | 29.2° |
| 2026-08-14 Fri | 0 | 0 | 0 | — | 50.2° 16:20 | 6.58 | 6% | 16.3° |
| 2026-08-15 Sat | 0 | 0 | 0 | — | 50.2° 16:15 | 6.64 | 12% | 7.9° |
| 2026-08-16 Sun | 0 | 0 | 0 | — | 50.2° 16:10 | 6.7 | 20% | 14.6° |
| 2026-08-17 Mon | 0 | 0 | 0 | — | 50.2° 16:10 | 6.76 | 29% | 26.2° |
| 2026-08-18 Tue | 0 | 0 | 0 | — | 50.2° 16:05 | 6.81 | 39% | 38.1° |
| 2026-08-19 Wed | 0 | 0 | 0 | — | 50.2° 16:00 | 6.87 | 48% | 50.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-07-21&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.