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: 12-01 (37), 11-30 (36), 11-29 (35), 11-28 (34), 12-02 (34) — by astronomy; check the weather when the night is within four days.

2036-11-09astronomy score per night — click a bar for that night2036-12-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-11-09 Sun	2	—	unknown	05:25–05:30 (marginal, 0.08 h)	50.2° 09:30	10.79	63%	62.9°
2036-11-10 Mon	2	—	unknown	05:20–05:35 (marginal, 0.25 h)	50.2° 09:30	10.83	52%	48.7°
2036-11-11 Tue	3	—	unknown	05:10–05:35 (marginal, 0.42 h)	50.2° 09:25	10.86	40%	34.6°
2036-11-12 Wed	5	—	unknown	05:05–05:35 (marginal, 0.5 h)	50.2° 09:20	10.89	29%	20.5°
2036-11-13 Thu	7	—	unknown	05:00–05:35 (marginal, 0.58 h)	50.2° 09:15	10.92	20%	6.4°
2036-11-14 Fri	9	—	unknown	05:30–05:35 (good, 0.08 h)	50.2° 09:10	10.95	12%	7.7°
2036-11-15 Sat	12	—	unknown	05:25–05:40 (good, 0.25 h)	50.2° 09:10	10.98	5%	21.7°
2036-11-16 Sun	14	—	unknown	05:20–05:40 (good, 0.33 h)	50.2° 09:05	11.0	2%	35.4°
2036-11-17 Mon	16	—	unknown	05:15–05:40 (good, 0.42 h)	50.2° 09:00	11.03	0%	49.0°
2036-11-18 Tue	18	—	unknown	05:10–05:40 (good, 0.5 h)	50.2° 08:55	11.06	1%	62.2°
2036-11-19 Wed	20	—	unknown	05:05–05:40 (good, 0.58 h)	50.2° 08:55	11.08	4%	75.2°
2036-11-20 Thu	21	—	unknown	05:00–05:45 (good, 0.75 h)	50.2° 08:50	11.11	9%	87.9°
2036-11-21 Fri	22	—	unknown	05:00–05:45 (good, 0.75 h)	50.2° 08:45	11.13	15%	100.3°
2036-11-22 Sat	24	—	unknown	04:55–05:45 (good, 0.83 h)	50.2° 08:40	11.16	23%	112.5°
2036-11-23 Sun	26	—	unknown	04:50–05:45 (good, 0.92 h)	50.2° 08:35	11.18	32%	124.4°
2036-11-24 Mon	27	—	unknown	04:45–05:45 (good, 1.0 h)	50.2° 08:35	11.2	40%	136.3°
2036-11-25 Tue	29	—	unknown	04:40–05:50 (good, 1.17 h)	50.2° 08:30	11.23	50%	148.1°
2036-11-26 Wed	31	—	unknown	04:40–05:50 (good, 1.17 h)	50.2° 08:25	11.25	59%	160.0°
2036-11-27 Thu	33	—	unknown	04:35–05:50 (good, 1.25 h)	50.2° 08:20	11.27	68%	172.0°
2036-11-28 Fri	34	—	unknown	04:30–05:50 (good, 1.33 h)	50.2° 08:15	11.29	77%	175.6°
2036-11-29 Sat	35	—	unknown	04:25–05:50 (good, 1.42 h)	50.2° 08:15	11.31	85%	163.1°
2036-11-30 Sun	36	—	unknown	04:30–05:50 (good, 1.33 h)	50.2° 08:10	11.32	92%	150.2°
2036-12-01 Mon	37	—	unknown	04:30–05:55 (good, 1.42 h)	50.2° 08:05	11.34	96%	137.0°
2036-12-02 Tue	34	—	unknown	04:25–05:55 (good, 1.5 h)	50.2° 08:00	11.36	99%	123.4°
2036-12-03 Wed	30	—	unknown	04:30–05:55 (good, 1.42 h)	50.2° 07:55	11.37	100%	109.4°
2036-12-04 Thu	24	—	unknown	05:00–05:55 (good, 0.92 h)	50.2° 07:55	11.39	98%	95.2°
2036-12-05 Fri	19	—	unknown	03:45–05:55 (marginal, 2.17 h)	50.2° 07:50	11.4	93%	80.9°
2036-12-06 Sat	16	—	unknown	03:50–05:55 (marginal, 2.08 h)	50.2° 07:45	11.41	86%	66.4°
2036-12-07 Sun	15	—	unknown	03:50–06:00 (marginal, 2.17 h)	50.2° 07:40	11.43	77%	52.0°
2036-12-08 Mon	15	—	unknown	03:45–06:00 (marginal, 2.25 h)	50.2° 07:40	11.44	66%	37.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-11-09&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.