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: 12-13 (60), 12-12 (58), 12-11 (57), 12-10 (55), 12-09 (53) — by astronomy; check the weather when the night is within four days.

2029-11-14astronomy score per night — click a bar for that night2029-12-13

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-11-14 Wed	10	—	unknown	05:25–05:35 (good, 0.17 h)	50.2° 09:15	10.94	68%	156.5°
2029-11-15 Thu	11	—	unknown	05:20–05:35 (good, 0.25 h)	50.2° 09:10	10.97	77%	166.5°
2029-11-16 Fri	14	—	unknown	05:20–05:40 (good, 0.33 h)	50.2° 09:05	11.0	84%	169.7°
2029-11-17 Sat	16	—	unknown	05:15–05:40 (good, 0.42 h)	50.2° 09:00	11.02	91%	162.5°
2029-11-18 Sun	17	—	unknown	05:20–05:40 (good, 0.33 h)	50.2° 08:55	11.05	95%	152.0°
2029-11-19 Mon	16	—	unknown	05:15–05:40 (good, 0.42 h)	50.2° 08:55	11.08	98%	140.7°
2029-11-20 Tue	17	—	unknown	05:15–05:45 (good, 0.5 h)	50.2° 08:50	11.1	100%	129.2°
2029-11-21 Wed	17	—	unknown	05:10–05:45 (good, 0.58 h)	50.2° 08:45	11.13	100%	117.5°
2029-11-22 Thu	15	—	unknown	05:20–05:45 (good, 0.42 h)	50.2° 08:40	11.15	97%	105.7°
2029-11-23 Fri	13	—	unknown	04:25–06:20 (marginal, 1.92 h)	50.2° 08:40	11.17	93%	93.7°
2029-11-24 Sat	12	—	unknown	04:30–05:45 (marginal, 1.25 h)	50.2° 08:35	11.2	87%	81.5°
2029-11-25 Sun	11	—	unknown	04:30–05:45 (marginal, 1.25 h)	50.2° 08:30	11.22	80%	69.2°
2029-11-26 Mon	11	—	unknown	04:25–05:50 (marginal, 1.42 h)	50.2° 08:25	11.24	71%	56.7°
2029-11-27 Tue	12	—	unknown	04:20–05:50 (marginal, 1.5 h)	50.2° 08:20	11.26	61%	44.1°
2029-11-28 Wed	14	—	unknown	04:10–05:50 (marginal, 1.67 h)	50.2° 08:20	11.28	51%	31.3°
2029-11-29 Thu	19	—	unknown	05:00–05:50 (good, 0.83 h)	50.2° 08:15	11.3	40%	18.9°
2029-11-30 Fri	25	—	unknown	04:40–05:50 (good, 1.17 h)	50.2° 08:10	11.32	29%	10.2°
2029-12-01 Sat	32	—	unknown	04:25–05:55 (good, 1.5 h)	50.2° 08:05	11.34	19%	15.8°
2029-12-02 Sun	38	—	unknown	04:15–05:55 (good, 1.67 h)	50.2° 08:00	11.35	11%	28.8°
2029-12-03 Mon	42	—	unknown	04:10–05:55 (good, 1.75 h)	50.2° 08:00	11.37	4%	43.1°
2029-12-04 Tue	44	—	unknown	04:05–05:55 (good, 1.83 h)	50.2° 07:55	11.38	1%	57.8°
2029-12-05 Wed	46	—	unknown	04:05–05:55 (good, 1.83 h)	50.2° 07:50	11.4	0%	72.5°
2029-12-06 Thu	47	—	unknown	04:00–05:55 (good, 1.92 h)	50.2° 07:45	11.41	2%	87.1°
2029-12-07 Fri	50	—	unknown	03:55–06:00 (good, 2.08 h)	50.2° 07:45	11.42	7%	101.4°
2029-12-08 Sat	51	—	unknown	03:50–06:00 (good, 2.17 h)	50.2° 07:40	11.44	14%	115.2°
2029-12-09 Sun	53	—	unknown	03:50–06:00 (good, 2.17 h)	50.2° 07:35	11.45	23%	128.4°
2029-12-10 Mon	55	—	unknown	03:45–06:00 (good, 2.25 h)	50.2° 07:30	11.46	32%	141.1°
2029-12-11 Tue	57	—	unknown	03:40–06:00 (good, 2.33 h)	50.2° 07:25	11.47	42%	153.1°
2029-12-12 Wed	58	—	unknown	03:35–06:00 (good, 2.42 h)	50.2° 07:25	11.47	52%	163.9°
2029-12-13 Thu	60	—	unknown	03:30–06:05 (good, 2.58 h)	50.2° 07:20	11.48	61%	170.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-11-14&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.