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: 11-11 (100), 11-12 (100), 11-13 (100), 11-14 (100), 11-15 (100) — by astronomy; check the weather when the night is within four days.

2034-11-11astronomy score per night — click a bar for that night2034-12-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-11-11 Sat	100	—	unknown	19:40–05:35 (good, 9.92 h)	72.5° 00:45	10.84	1%	171.2°
2034-11-12 Sun	100	—	unknown	19:35–05:35 (good, 10.0 h)	72.5° 00:40	10.87	3%	165.7°
2034-11-13 Mon	100	—	unknown	19:30–05:35 (good, 10.08 h)	72.5° 00:35	10.9	7%	155.3°
2034-11-14 Tue	100	—	unknown	19:30–05:35 (good, 10.08 h)	72.5° 00:35	10.93	13%	144.0°
2034-11-15 Wed	100	—	unknown	19:25–05:35 (good, 10.17 h)	72.5° 00:30	10.96	20%	132.4°
2034-11-16 Thu	100	—	unknown	19:20–05:35 (good, 10.25 h)	72.5° 00:25	10.99	28%	120.5°
2034-11-17 Fri	100	—	unknown	19:20–05:30 (good, 10.17 h)	72.5° 00:20	11.02	38%	108.3°
2034-11-18 Sat	100	—	unknown	19:25–05:30 (good, 10.08 h)	72.5° 00:15	11.04	47%	95.9°
2034-11-19 Sun	100	—	unknown	19:30–05:25 (good, 9.92 h)	72.5° 00:15	11.07	58%	83.0°
2034-11-20 Mon	100	—	unknown	20:10–05:20 (good, 9.17 h)	72.5° 00:10	11.1	68%	69.8°
2034-11-21 Tue	96	—	unknown	22:15–05:15 (good, 7.0 h)	72.5° 00:05	11.12	78%	56.1°
2034-11-22 Wed	87	—	unknown	03:30–05:15 (good, 1.75 h)	72.5° 00:00	11.15	87%	42.0°
2034-11-23 Thu	64	—	unknown	05:00–05:10 (good, 0.17 h)	72.5° 00:00	11.17	94%	27.8°
2034-11-24 Fri	33	—	unknown	01:15–05:10 (marginal, 3.92 h)	72.5° 23:55	11.19	98%	14.3°
2034-11-25 Sat	28	—	unknown	18:50–21:30 (marginal, 2.67 h)	72.5° 23:50	11.21	100%	9.6°
2034-11-26 Sun	34	—	unknown	18:35–22:50 (marginal, 4.25 h)	72.5° 23:45	11.24	98%	21.1°
2034-11-27 Mon	72	—	unknown	18:35–18:55 (good, 0.33 h)	72.5° 23:40	11.26	94%	35.3°
2034-11-28 Tue	87	—	unknown	18:35–22:15 (good, 3.67 h)	72.5° 23:40	11.28	87%	49.8°
2034-11-29 Wed	96	—	unknown	18:35–01:55 (good, 7.33 h)	72.5° 23:35	11.3	78%	63.9°
2034-11-30 Thu	100	—	unknown	18:35–03:40 (good, 9.08 h)	72.5° 23:30	11.31	68%	77.6°
2034-12-01 Fri	100	—	unknown	18:35–04:20 (good, 9.75 h)	72.5° 23:25	11.33	58%	90.9°
2034-12-02 Sat	100	—	unknown	18:35–04:25 (good, 9.83 h)	72.5° 23:20	11.35	48%	103.7°
2034-12-03 Sun	100	—	unknown	18:35–04:25 (good, 9.83 h)	72.5° 23:20	11.36	38%	116.2°
2034-12-04 Mon	100	—	unknown	18:35–04:25 (good, 9.83 h)	72.5° 23:15	11.38	28%	128.3°
2034-12-05 Tue	100	—	unknown	18:35–04:20 (good, 9.75 h)	72.5° 23:10	11.39	20%	140.1°
2034-12-06 Wed	100	—	unknown	18:35–04:15 (good, 9.67 h)	72.5° 23:05	11.41	13%	151.6°
2034-12-07 Thu	100	—	unknown	18:35–04:15 (good, 9.67 h)	72.5° 23:05	11.42	8%	162.5°
2034-12-08 Fri	100	—	unknown	18:35–04:10 (good, 9.58 h)	72.5° 23:00	11.43	3%	170.6°
2034-12-09 Sat	100	—	unknown	18:35–04:05 (good, 9.5 h)	72.5° 22:55	11.44	1%	167.8°
2034-12-10 Sun	100	—	unknown	18:35–04:00 (good, 9.42 h)	72.5° 22:50	11.45	0%	158.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-11-11&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.