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 3C 273: 12-11 (56), 12-10 (55), 12-09 (53), 12-08 (50), 12-07 (47) — by astronomy; check the weather when the night is within four days.

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

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-11-12 Sun	7	—	unknown	05:05–06:05 (marginal, 1.0 h)	50.2° 09:20	10.87	3%	64.7°
2034-11-13 Mon	8	—	unknown	05:30–05:35 (good, 0.08 h)	50.2° 09:20	10.9	7%	76.5°
2034-11-14 Tue	10	—	unknown	05:25–05:35 (good, 0.17 h)	50.2° 09:15	10.93	13%	88.4°
2034-11-15 Wed	11	—	unknown	05:25–05:35 (good, 0.17 h)	50.2° 09:10	10.96	20%	100.3°
2034-11-16 Thu	14	—	unknown	05:20–05:40 (good, 0.33 h)	50.2° 09:05	10.99	28%	112.4°
2034-11-17 Fri	15	—	unknown	05:15–05:40 (good, 0.42 h)	50.2° 09:00	11.02	38%	124.7°
2034-11-18 Sat	17	—	unknown	05:10–05:40 (good, 0.5 h)	50.2° 09:00	11.04	47%	137.3°
2034-11-19 Sun	19	—	unknown	05:10–05:40 (good, 0.5 h)	50.2° 08:55	11.07	58%	150.2°
2034-11-20 Mon	20	—	unknown	05:05–05:40 (good, 0.58 h)	50.2° 08:50	11.1	68%	163.4°
2034-11-21 Tue	22	—	unknown	05:00–05:45 (good, 0.75 h)	50.2° 08:45	11.12	78%	175.8°
2034-11-22 Wed	23	—	unknown	04:55–05:45 (good, 0.83 h)	50.2° 08:45	11.15	87%	167.5°
2034-11-23 Thu	24	—	unknown	05:00–05:45 (good, 0.75 h)	50.2° 08:40	11.17	94%	152.9°
2034-11-24 Fri	22	—	unknown	04:55–05:45 (good, 0.83 h)	50.2° 08:35	11.19	98%	137.9°
2034-11-25 Sat	22	—	unknown	04:55–05:45 (good, 0.83 h)	50.2° 08:30	11.21	100%	122.7°
2034-11-26 Sun	20	—	unknown	05:00–05:50 (good, 0.83 h)	50.2° 08:25	11.24	98%	107.4°
2034-11-27 Mon	16	—	unknown	05:40–05:50 (good, 0.17 h)	50.2° 08:25	11.26	94%	92.3°
2034-11-28 Tue	14	—	unknown	04:15–05:50 (marginal, 1.58 h)	50.2° 08:20	11.28	87%	77.5°
2034-11-29 Wed	12	—	unknown	04:15–05:50 (marginal, 1.58 h)	50.2° 08:15	11.3	78%	63.2°
2034-11-30 Thu	12	—	unknown	04:10–05:50 (marginal, 1.67 h)	50.2° 08:10	11.31	68%	49.3°
2034-12-01 Fri	14	—	unknown	04:05–05:55 (marginal, 1.83 h)	50.2° 08:05	11.33	58%	35.9°
2034-12-02 Sat	18	—	unknown	03:55–05:55 (marginal, 2.0 h)	50.2° 08:05	11.35	48%	23.0°
2034-12-03 Sun	24	—	unknown	04:40–05:55 (good, 1.25 h)	50.2° 08:00	11.36	38%	10.7°
2034-12-04 Mon	30	—	unknown	04:25–05:55 (good, 1.5 h)	50.2° 07:55	11.38	28%	4.0°
2034-12-05 Tue	36	—	unknown	04:15–05:55 (good, 1.67 h)	50.2° 07:50	11.39	20%	14.7°
2034-12-06 Wed	41	—	unknown	04:00–05:55 (good, 1.92 h)	50.2° 07:50	11.41	13%	26.4°
2034-12-07 Thu	47	—	unknown	03:55–06:00 (good, 2.08 h)	50.2° 07:45	11.42	8%	38.2°
2034-12-08 Fri	50	—	unknown	03:55–06:00 (good, 2.08 h)	50.2° 07:40	11.43	3%	50.0°
2034-12-09 Sat	53	—	unknown	03:50–06:00 (good, 2.17 h)	50.2° 07:35	11.44	1%	61.8°
2034-12-10 Sun	55	—	unknown	03:45–06:00 (good, 2.25 h)	50.2° 07:30	11.45	0%	73.6°
2034-12-11 Mon	56	—	unknown	03:40–06:00 (good, 2.33 h)	50.2° 07:30	11.46	1%	85.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-11-12&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.