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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.

2044-09-10astronomy score per night — click a bar for that night2044-10-09
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2044-09-10 Sat 0 — unknown — 50.1° 14:30 8.14 87% 153.7°
2044-09-11 Sun 0 — unknown — 50.1° 14:30 8.19 79% 140.5°
2044-09-12 Mon 0 — unknown — 50.1° 14:25 8.25 69% 126.9°
2044-09-13 Tue 0 — unknown — 50.1° 14:20 8.3 58% 113.1°
2044-09-14 Wed 0 — unknown — 50.1° 14:15 8.35 47% 99.2°
2044-09-15 Thu 0 — unknown — 50.1° 14:10 8.41 36% 85.1°
2044-09-16 Fri 0 — unknown — 50.1° 14:10 8.46 25% 70.9°
2044-09-17 Sat 0 — unknown — 50.1° 14:05 8.51 16% 56.7°
2044-09-18 Sun 0 — unknown — 50.1° 14:00 8.56 8% 42.5°
2044-09-19 Mon 0 — unknown — 50.1° 13:55 8.61 3% 28.5°
2044-09-20 Tue 0 — unknown — 50.1° 13:55 8.67 0% 15.3°
2044-09-21 Wed 0 — unknown — 50.1° 13:50 8.72 0% 6.9°
2044-09-22 Thu 0 — unknown — 50.1° 13:45 8.77 3% 15.4°
2044-09-23 Fri 0 — unknown — 50.1° 13:40 8.82 7% 27.8°
2044-09-24 Sat 0 — unknown — 50.1° 13:35 8.87 13% 40.3°
2044-09-25 Sun 0 — unknown — 50.1° 13:35 8.92 21% 52.7°
2044-09-26 Mon 0 — unknown — 50.1° 13:30 8.97 29% 64.8°
2044-09-27 Tue 0 — unknown — 50.1° 13:25 9.02 38% 76.7°
2044-09-28 Wed 0 — unknown — 50.1° 13:20 9.07 48% 88.5°
2044-09-29 Thu 0 — unknown — 50.1° 13:15 9.11 57% 100.3°
2044-09-30 Fri 0 — unknown — 50.1° 13:15 9.16 66% 112.1°
2044-10-01 Sat 0 — unknown — 50.1° 13:10 9.21 75% 123.9°
2044-10-02 Sun 0 — unknown — 50.1° 13:05 9.26 83% 135.9°
2044-10-03 Mon 0 — unknown — 50.1° 13:00 9.31 90% 148.1°
2044-10-04 Tue 0 — unknown — 50.1° 12:55 9.35 95% 160.3°
2044-10-05 Wed 0 — unknown — 50.1° 12:55 9.4 99% 171.1°
2044-10-06 Thu 0 — unknown — 50.1° 12:50 9.45 100% 169.6°
2044-10-07 Fri 0 — unknown — 50.1° 12:45 9.49 99% 157.6°
2044-10-08 Sat 0 — unknown — 50.1° 12:40 9.54 96% 144.2°
2044-10-09 Sun 0 — unknown — 50.1° 12:40 9.58 90% 130.5°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-09-10&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.