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: 12-09 (54), 12-08 (52), 12-07 (50), 12-06 (47), 12-05 (46) — by astronomy; check the weather when the night is within four days.

2032-11-10astronomy score per night — click a bar for that night2032-12-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-11-10 Wed	5	—	unknown	05:15–05:35 (marginal, 0.33 h)	50.2° 09:30	10.83	55%	137.9°
2032-11-11 Thu	6	—	unknown	05:10–06:05 (marginal, 0.92 h)	50.2° 09:25	10.86	66%	151.8°
2032-11-12 Fri	8	—	unknown	05:05–06:05 (marginal, 1.0 h)	50.2° 09:20	10.89	77%	165.2°
2032-11-13 Sat	9	—	unknown	05:30–05:35 (good, 0.08 h)	50.2° 09:15	10.92	86%	172.9°
2032-11-14 Sun	11	—	unknown	05:25–05:35 (good, 0.17 h)	50.2° 09:10	10.95	93%	162.9°
2032-11-15 Mon	11	—	unknown	05:30–05:40 (good, 0.17 h)	50.2° 09:10	10.97	98%	149.3°
2032-11-16 Tue	11	—	unknown	05:25–05:40 (good, 0.25 h)	50.2° 09:05	11.0	100%	135.4°
2032-11-17 Wed	13	—	unknown	05:25–05:40 (good, 0.25 h)	50.2° 09:00	11.03	99%	121.7°
2032-11-18 Thu	12	—	unknown	05:30–05:40 (good, 0.17 h)	50.2° 08:55	11.06	97%	108.2°
2032-11-19 Fri	11	—	unknown	04:40–05:40 (marginal, 1.0 h)	50.2° 08:50	11.08	92%	95.1°
2032-11-20 Sat	10	—	unknown	04:40–05:45 (marginal, 1.08 h)	50.2° 08:50	11.11	85%	82.3°
2032-11-21 Sun	9	—	unknown	04:40–05:45 (marginal, 1.08 h)	50.2° 08:45	11.13	78%	69.9°
2032-11-22 Mon	9	—	unknown	04:40–05:45 (marginal, 1.08 h)	50.2° 08:40	11.16	69%	57.8°
2032-11-23 Tue	10	—	unknown	04:30–05:45 (marginal, 1.25 h)	50.2° 08:35	11.18	60%	45.9°
2032-11-24 Wed	12	—	unknown	04:25–05:45 (marginal, 1.33 h)	50.2° 08:35	11.2	50%	34.2°
2032-11-25 Thu	15	—	unknown	05:40–05:50 (good, 0.17 h)	50.2° 08:30	11.22	41%	22.8°
2032-11-26 Fri	20	—	unknown	05:00–05:50 (good, 0.83 h)	50.2° 08:25	11.25	32%	12.0°
2032-11-27 Sat	24	—	unknown	04:45–05:50 (good, 1.08 h)	50.2° 08:20	11.27	23%	7.2°
2032-11-28 Sun	29	—	unknown	04:35–05:50 (good, 1.25 h)	50.2° 08:15	11.29	16%	15.8°
2032-11-29 Mon	33	—	unknown	04:25–05:50 (good, 1.42 h)	50.2° 08:15	11.3	9%	27.5°
2032-11-30 Tue	37	—	unknown	04:20–05:50 (good, 1.5 h)	50.2° 08:10	11.32	4%	39.9°
2032-12-01 Wed	39	—	unknown	04:20–05:55 (good, 1.58 h)	50.2° 08:05	11.34	1%	52.7°
2032-12-02 Thu	41	—	unknown	04:15–05:55 (good, 1.67 h)	50.2° 08:00	11.36	0%	65.9°
2032-12-03 Fri	43	—	unknown	04:10–05:55 (good, 1.75 h)	50.2° 07:55	11.37	2%	79.4°
2032-12-04 Sat	44	—	unknown	04:05–05:55 (good, 1.83 h)	50.2° 07:55	11.39	5%	93.1°
2032-12-05 Sun	46	—	unknown	04:05–05:55 (good, 1.83 h)	50.2° 07:50	11.4	11%	107.0°
2032-12-06 Mon	47	—	unknown	04:00–05:55 (good, 1.92 h)	50.2° 07:45	11.41	20%	120.9°
2032-12-07 Tue	50	—	unknown	03:55–06:00 (good, 2.08 h)	50.2° 07:40	11.43	29%	134.9°
2032-12-08 Wed	52	—	unknown	03:50–06:00 (good, 2.17 h)	50.2° 07:40	11.44	40%	148.8°
2032-12-09 Thu	54	—	unknown	03:45–06:00 (good, 2.25 h)	50.2° 07:35	11.45	52%	162.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-11-10&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.