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: 11-03 (100), 11-04 (100), 11-05 (100), 11-06 (100), 11-07 (100) — by astronomy; check the weather when the night is within four days.

2034-10-27astronomy score per night — click a bar for that night2034-11-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-10-27 Fri	27	—	unknown	03:45–06:15 (marginal, 2.5 h)	72.5° 02:45	10.32	100%	21.2°
2034-10-28 Sat	25	—	unknown	21:40–00:35 (marginal, 2.92 h)	72.5° 02:40	10.35	97%	9.7°
2034-10-29 Sun	35	—	unknown	20:20–05:20 (marginal, 9.0 h)	72.5° 01:35	10.39	91%	14.0°
2034-10-30 Mon	50	—	unknown	20:00–05:20 (marginal, 9.33 h)	72.5° 01:30	10.43	84%	27.1°
2034-10-31 Tue	83	—	unknown	20:20–00:05 (good, 3.75 h)	72.5° 01:30	10.47	74%	41.1°
2034-11-01 Wed	91	—	unknown	20:20–04:10 (good, 7.83 h)	72.5° 01:25	10.5	63%	54.9°
2034-11-02 Thu	99	—	unknown	20:15–05:25 (good, 9.17 h)	72.5° 01:20	10.54	52%	68.4°
2034-11-03 Fri	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.5° 01:15	10.58	42%	81.6°
2034-11-04 Sat	100	—	unknown	20:05–05:25 (good, 9.33 h)	72.5° 01:10	10.61	32%	94.4°
2034-11-05 Sun	100	—	unknown	20:05–05:25 (good, 9.33 h)	72.5° 01:10	10.64	23%	106.9°
2034-11-06 Mon	100	—	unknown	20:00–05:30 (good, 9.5 h)	72.5° 01:05	10.68	15%	119.1°
2034-11-07 Tue	100	—	unknown	19:55–05:30 (good, 9.58 h)	72.5° 01:00	10.71	9%	131.1°
2034-11-08 Wed	100	—	unknown	19:50–05:30 (good, 9.67 h)	72.5° 00:55	10.75	4%	142.9°
2034-11-09 Thu	100	—	unknown	19:45–05:30 (good, 9.75 h)	72.5° 00:55	10.78	1%	154.4°
2034-11-10 Fri	100	—	unknown	19:45–05:30 (good, 9.75 h)	72.5° 00:50	10.81	0%	164.9°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-10-27&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.