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.

Best nights for Seven Sisters: 07-07 (1) — by astronomy; check the weather when the night is within four days.

2046-06-08astronomy score per night — click a bar for that night2046-07-07

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-06-08 Fri	0	—	unknown	—	72.6° 12:00	4.58	21%	73.0°
2046-06-09 Sat	0	—	unknown	—	72.6° 11:55	4.55	31%	87.1°
2046-06-10 Sun	0	—	unknown	—	72.6° 11:50	4.53	42%	101.2°
2046-06-11 Mon	0	—	unknown	—	72.6° 11:45	4.51	53%	115.4°
2046-06-12 Tue	0	—	unknown	—	72.6° 11:45	4.49	65%	129.6°
2046-06-13 Wed	0	—	unknown	—	72.6° 11:40	4.48	75%	143.8°
2046-06-14 Thu	0	—	unknown	—	72.6° 11:35	4.46	84%	157.9°
2046-06-15 Fri	0	—	unknown	—	72.6° 11:30	4.45	92%	171.9°
2046-06-16 Sat	0	—	unknown	—	72.6° 11:25	4.44	97%	174.2°
2046-06-17 Sun	0	—	unknown	—	72.6° 11:25	4.43	99%	160.6°
2046-06-18 Mon	0	—	unknown	—	72.6° 11:20	4.43	100%	147.2°
2046-06-19 Tue	0	—	unknown	—	72.6° 11:15	4.42	98%	134.1°
2046-06-20 Wed	0	—	unknown	—	72.6° 11:10	4.42	94%	121.3°
2046-06-21 Thu	0	—	unknown	—	72.6° 11:05	4.42	88%	108.7°
2046-06-22 Fri	0	—	unknown	—	72.6° 11:05	4.43	81%	96.5°
2046-06-23 Sat	0	—	unknown	—	72.6° 11:00	4.43	73%	84.4°
2046-06-24 Sun	0	—	unknown	—	72.6° 10:55	4.44	64%	72.5°
2046-06-25 Mon	0	—	unknown	—	72.6° 10:50	4.45	55%	60.6°
2046-06-26 Tue	0	—	unknown	—	72.6° 10:50	4.46	45%	48.8°
2046-06-27 Wed	0	—	unknown	—	72.6° 10:45	4.47	36%	36.8°
2046-06-28 Thu	0	—	unknown	—	72.6° 10:40	4.48	27%	24.7°
2046-06-29 Fri	0	—	unknown	—	72.6° 10:35	4.5	19%	12.3°
2046-06-30 Sat	0	—	unknown	—	72.6° 10:30	4.52	11%	0.8°
2046-07-01 Sun	0	—	unknown	—	72.6° 10:30	4.54	6%	13.5°
2046-07-02 Mon	0	—	unknown	—	72.6° 10:25	4.56	2%	26.9°
2046-07-03 Tue	0	—	unknown	—	72.6° 10:20	4.59	0%	40.6°
2046-07-04 Wed	0	—	unknown	—	72.6° 10:15	4.61	1%	54.7°
2046-07-05 Thu	0	—	unknown	—	72.6° 10:10	4.64	4%	68.9°
2046-07-06 Fri	0	—	unknown	—	72.6° 10:10	4.67	11%	83.3°
2046-07-07 Sat	1	—	unknown	—	72.6° 10:05	4.7	19%	97.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-06-08&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.