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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.

2040-10-01astronomy score per night — click a bar for that night2040-10-30
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2040-10-01 Mon 0 — unknown — 50.1° 13:10 9.21 18% 45.7°
2040-10-02 Tue 0 — unknown — 50.1° 13:05 9.26 11% 33.6°
2040-10-03 Wed 0 — unknown — 50.1° 13:00 9.3 6% 21.4°
2040-10-04 Thu 0 — unknown — 50.1° 12:55 9.35 2% 8.9°
2040-10-05 Fri 0 — unknown — 50.1° 12:55 9.4 0% 3.9°
2040-10-06 Sat 0 — unknown — 50.1° 12:50 9.44 1% 16.9°
2040-10-07 Sun 0 — unknown — 50.1° 12:45 9.49 3% 30.1°
2040-10-08 Mon 0 — unknown — 50.1° 12:40 9.54 8% 43.5°
2040-10-09 Tue 0 — unknown — 50.1° 12:40 9.58 15% 57.1°
2040-10-10 Wed 0 — unknown — 50.1° 12:35 9.63 24% 70.9°
2040-10-11 Thu 0 — unknown — 50.1° 12:30 9.67 34% 84.8°
2040-10-12 Fri 0 — unknown — 50.1° 12:25 9.72 45% 98.8°
2040-10-13 Sat 0 — unknown — 50.1° 12:20 9.76 56% 113.0°
2040-10-14 Sun 0 — unknown — 50.1° 12:20 9.8 68% 127.2°
2040-10-15 Mon 0 — unknown — 50.1° 12:15 9.85 78% 141.4°
2040-10-16 Tue 0 — unknown — 50.1° 12:10 9.89 87% 155.7°
2040-10-17 Wed 0 — unknown — 50.1° 12:05 9.93 93% 169.8°
2040-10-18 Thu 0 — unknown — 50.1° 12:00 9.98 98% 176.0°
2040-10-19 Fri 0 — unknown — 50.1° 11:55 10.02 100% 162.2°
2040-10-20 Sat 0 — unknown — 50.1° 11:50 10.06 99% 148.7°
2040-10-21 Sun 0 — unknown — 50.1° 11:45 10.1 97% 135.4°
2040-10-22 Mon 0 — unknown — 50.1° 11:45 10.14 92% 122.4°
2040-10-23 Tue 0 — unknown — 50.1° 11:40 10.18 86% 109.8°
2040-10-24 Wed 0 — unknown — 50.1° 11:35 10.22 78% 97.5°
2040-10-25 Thu 0 — unknown — 50.1° 11:30 10.26 69% 85.4°
2040-10-26 Fri 0 — unknown — 50.1° 11:25 10.3 60% 73.4°
2040-10-27 Sat 0 — unknown — 50.1° 10:25 10.34 51% 61.6°
2040-10-28 Sun 0 — unknown — 50.1° 10:20 10.38 42% 49.8°
2040-10-29 Mon 0 — unknown — 50.1° 10:15 10.41 32% 37.9°
2040-10-30 Tue 0 — unknown — 50.1° 10:10 10.45 24% 25.8°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-10-01&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.