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.

2032-05-30astronomy score per night — click a bar for that night2032-06-28

night of	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-30 Sun	—	unknown	—	72.5° 12:35	4.85	61%	91.8°
2032-05-31 Mon	—	unknown	—	72.5° 12:30	4.81	49%	77.7°
2032-06-01 Tue	—	unknown	—	72.5° 12:30	4.78	38%	63.8°
2032-06-02 Wed	—	unknown	—	72.5° 12:25	4.74	28%	50.0°
2032-06-03 Thu	—	unknown	—	72.5° 12:20	4.71	18%	36.4°
2032-06-04 Fri	—	unknown	—	72.5° 12:15	4.68	11%	23.2°
2032-06-05 Sat	—	unknown	—	72.5° 12:10	4.65	5%	10.8°
2032-06-06 Sun	—	unknown	—	72.5° 12:10	4.62	1%	7.1°
2032-06-07 Mon	—	unknown	—	72.5° 12:00	4.59	0%	17.9°
2032-06-08 Tue	—	unknown	—	72.5° 12:00	4.57	1%	30.1°
2032-06-09 Wed	—	unknown	—	72.5° 11:50	4.54	4%	42.3°
2032-06-10 Thu	—	unknown	—	72.5° 11:50	4.52	8%	54.4°
2032-06-11 Fri	—	unknown	—	72.5° 11:45	4.5	14%	66.4°
2032-06-12 Sat	—	unknown	—	72.5° 11:40	4.49	22%	78.2°
2032-06-13 Sun	—	unknown	—	72.5° 11:35	4.47	30%	90.0°
2032-06-14 Mon	—	unknown	—	72.5° 11:35	4.46	39%	101.8°
2032-06-15 Tue	—	unknown	—	72.5° 11:30	4.45	48%	113.6°
2032-06-16 Wed	—	unknown	—	72.5° 11:25	4.44	58%	125.6°
2032-06-17 Thu	—	unknown	—	72.5° 11:20	4.43	67%	137.8°
2032-06-18 Fri	—	unknown	—	72.5° 11:15	4.43	76%	150.3°
2032-06-19 Sat	—	unknown	—	72.5° 11:15	4.42	85%	162.8°
2032-06-20 Sun	—	unknown	—	72.5° 11:10	4.42	92%	173.5°
2032-06-21 Mon	—	unknown	—	72.5° 11:05	4.42	97%	167.4°
2032-06-22 Tue	—	unknown	—	72.5° 11:00	4.43	100%	154.0°
2032-06-23 Wed	—	unknown	—	72.5° 10:55	4.43	100%	139.7°
2032-06-24 Thu	—	unknown	—	72.5° 10:55	4.44	97%	125.1°
2032-06-25 Fri	—	unknown	—	72.5° 10:50	4.45	91%	110.5°
2032-06-26 Sat	—	unknown	—	72.5° 10:45	4.46	84%	95.8°
2032-06-27 Sun	—	unknown	—	72.5° 10:40	4.48	74%	81.3°
2032-06-28 Mon	—	unknown	—	72.5° 10:40	4.49	63%	67.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-30&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.