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.

2032-05-13astronomy score per night — click a bar for that night2032-06-11

night of	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-13 Thu	—	unknown	—	72.5° 13:40	5.66	19%	46.4°
2032-05-14 Fri	—	unknown	—	72.5° 13:40	5.6	27%	58.4°
2032-05-15 Sat	—	unknown	—	72.5° 13:35	5.55	36%	70.3°
2032-05-16 Sun	—	unknown	—	72.5° 13:30	5.5	46%	82.1°
2032-05-17 Mon	—	unknown	—	72.5° 13:25	5.44	55%	93.8°
2032-05-18 Tue	—	unknown	—	72.5° 13:25	5.39	64%	105.7°
2032-05-19 Wed	—	unknown	—	72.5° 13:20	5.34	73%	117.7°
2032-05-20 Thu	—	unknown	—	72.5° 13:15	5.29	82%	129.9°
2032-05-21 Fri	—	unknown	—	72.5° 13:10	5.24	89%	142.4°
2032-05-22 Sat	—	unknown	—	72.5° 13:05	5.2	94%	155.1°
2032-05-23 Sun	—	unknown	—	72.5° 13:05	5.15	98%	167.6°
2032-05-24 Mon	—	unknown	—	72.5° 13:00	5.1	100%	173.5°
2032-05-25 Tue	—	unknown	—	72.5° 12:55	5.06	99%	162.4°
2032-05-26 Wed	—	unknown	—	72.5° 12:50	5.01	96%	148.7°
2032-05-27 Thu	—	unknown	—	72.5° 12:45	4.97	90%	134.6°
2032-05-28 Fri	—	unknown	—	72.5° 12:45	4.93	82%	120.3°
2032-05-29 Sat	—	unknown	—	72.5° 12:40	4.89	72%	106.1°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-13&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.