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Rozhen Observation Calendar

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.

2041-10-04astronomy score per night — click a bar for that night2041-11-02
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2041-10-04 Fri 0 — unknown — 50.1° 13:00 9.34 70% 119.5°
2041-10-05 Sat 0 — unknown — 50.1° 12:55 9.39 80% 133.9°
2041-10-06 Sun 0 — unknown — 50.1° 12:50 9.43 88% 148.6°
2041-10-07 Mon 0 — unknown — 50.1° 12:45 9.48 95% 163.5°
2041-10-08 Tue 0 — unknown — 50.1° 12:45 9.53 99% 177.5°
2041-10-09 Wed 0 — unknown — 50.1° 12:40 9.57 100% 166.2°
2041-10-10 Thu 0 — unknown — 50.1° 12:35 9.62 98% 151.5°
2041-10-11 Fri 0 — unknown — 50.1° 12:30 9.66 94% 137.0°
2041-10-12 Sat 0 — unknown — 50.1° 12:25 9.71 87% 123.0°
2041-10-13 Sun 0 — unknown — 50.1° 12:25 9.75 78% 109.4°
2041-10-14 Mon 0 — unknown — 50.1° 12:20 9.79 69% 96.2°
2041-10-15 Tue 0 — unknown — 50.1° 12:15 9.84 60% 83.5°
2041-10-16 Wed 0 — unknown — 50.1° 12:10 9.88 50% 71.2°
2041-10-17 Thu 0 — unknown — 50.1° 12:05 9.92 40% 59.1°
2041-10-18 Fri 0 — unknown — 50.1° 12:00 9.97 31% 47.1°
2041-10-19 Sat 0 — unknown — 50.1° 11:55 10.01 22% 35.3°
2041-10-20 Sun 0 — unknown — 50.1° 11:50 10.05 15% 23.6°
2041-10-21 Mon 0 — unknown — 50.1° 11:50 10.09 9% 11.8°
2041-10-22 Tue 0 — unknown — 50.1° 11:45 10.13 4% 2.1°
2041-10-23 Wed 0 — unknown — 50.1° 11:40 10.17 1% 12.6°
2041-10-24 Thu 0 — unknown — 50.1° 11:35 10.21 0% 24.7°
2041-10-25 Fri 0 — unknown — 50.1° 11:30 10.25 1% 37.1°
2041-10-26 Sat 0 — unknown — 50.1° 10:30 10.29 3% 49.7°
2041-10-27 Sun 0 — unknown — 50.1° 10:25 10.33 8% 62.5°
2041-10-28 Mon 0 — unknown — 50.1° 10:20 10.37 15% 75.5°
2041-10-29 Tue 0 — unknown — 50.1° 10:15 10.4 23% 88.7°
2041-10-30 Wed 0 — unknown — 50.1° 10:10 10.44 33% 102.1°
2041-10-31 Thu 0 — unknown — 50.1° 10:10 10.48 44% 115.7°
2041-11-01 Fri 0 — unknown — 50.1° 10:05 10.51 55% 129.6°
2041-11-02 Sat 0 — unknown — 50.1° 10:00 10.55 66% 143.8°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-10-04&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One 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.