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: 12-05 (45), 12-04 (44), 12-03 (42), 12-02 (40), 12-01 (38) — by astronomy; check the weather when the night is within four days.

2046-11-06astronomy score per night — click a bar for that night2046-12-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-11-06 Tue	1	—	unknown	—	50.1° 09:45	10.68	63%	143.6°
2046-11-07 Wed	2	—	unknown	05:25–05:30 (marginal, 0.08 h)	50.1° 09:40	10.72	72%	154.9°
2046-11-08 Thu	3	—	unknown	05:50–06:05 (marginal, 0.25 h)	50.1° 09:40	10.75	80%	165.2°
2046-11-09 Fri	4	—	unknown	05:45–06:05 (marginal, 0.33 h)	50.1° 09:35	10.78	87%	170.6°
2046-11-10 Sat	4	—	unknown	05:15–05:30 (marginal, 0.25 h)	50.1° 09:30	10.81	93%	164.7°
2046-11-11 Sun	5	—	unknown	05:10–05:35 (marginal, 0.42 h)	50.1° 09:25	10.84	97%	154.2°
2046-11-12 Mon	6	—	unknown	05:05–05:35 (marginal, 0.5 h)	50.1° 09:20	10.87	99%	142.8°
2046-11-13 Tue	6	—	unknown	05:05–05:35 (marginal, 0.5 h)	50.1° 09:20	10.91	100%	131.0°
2046-11-14 Wed	7	—	unknown	05:00–05:35 (marginal, 0.58 h)	50.1° 09:15	10.93	98%	118.9°
2046-11-15 Thu	7	—	unknown	04:55–05:35 (marginal, 0.67 h)	50.1° 09:10	10.96	95%	106.6°
2046-11-16 Fri	7	—	unknown	04:55–05:40 (marginal, 0.75 h)	50.1° 09:05	10.99	90%	94.1°
2046-11-17 Sat	6	—	unknown	04:55–05:40 (marginal, 0.75 h)	50.1° 09:05	11.02	83%	81.3°
2046-11-18 Sun	6	—	unknown	04:55–05:40 (marginal, 0.75 h)	50.1° 09:00	11.05	74%	68.4°
2046-11-19 Mon	7	—	unknown	04:50–05:40 (marginal, 0.83 h)	50.1° 08:55	11.07	64%	55.3°
2046-11-20 Tue	8	—	unknown	04:45–05:40 (marginal, 0.92 h)	50.1° 08:50	11.1	54%	42.0°
2046-11-21 Wed	11	—	unknown	04:35–05:45 (marginal, 1.17 h)	50.1° 08:45	11.12	43%	28.7°
2046-11-22 Thu	15	—	unknown	05:20–05:45 (good, 0.42 h)	50.1° 08:45	11.15	32%	16.1°
2046-11-23 Fri	19	—	unknown	05:05–05:45 (good, 0.67 h)	50.1° 08:40	11.17	21%	9.6°
2046-11-24 Sat	23	—	unknown	04:55–05:45 (good, 0.83 h)	50.1° 08:35	11.19	12%	18.6°
2046-11-25 Sun	28	—	unknown	04:45–05:45 (good, 1.0 h)	50.1° 08:30	11.22	6%	32.1°
2046-11-26 Mon	30	—	unknown	04:40–05:50 (good, 1.17 h)	50.1° 08:25	11.24	2%	46.4°
2046-11-27 Tue	31	—	unknown	04:35–05:50 (good, 1.25 h)	50.1° 08:25	11.26	0%	60.7°
2046-11-28 Wed	33	—	unknown	04:35–05:50 (good, 1.25 h)	50.1° 08:20	11.28	1%	74.8°
2046-11-29 Thu	35	—	unknown	04:30–05:50 (good, 1.33 h)	50.1° 08:15	11.3	5%	88.7°
2046-11-30 Fri	36	—	unknown	04:25–05:50 (good, 1.42 h)	50.1° 08:10	11.32	11%	102.1°
2046-12-01 Sat	38	—	unknown	04:20–05:55 (good, 1.58 h)	50.1° 08:10	11.33	19%	115.1°
2046-12-02 Sun	40	—	unknown	04:15–05:55 (good, 1.67 h)	50.1° 08:05	11.35	27%	127.7°
2046-12-03 Mon	42	—	unknown	04:15–05:55 (good, 1.67 h)	50.1° 08:00	11.37	36%	139.8°
2046-12-04 Tue	44	—	unknown	04:10–05:55 (good, 1.75 h)	50.1° 07:55	11.38	46%	151.4°
2046-12-05 Wed	45	—	unknown	04:05–05:55 (good, 1.83 h)	50.1° 07:50	11.4	56%	162.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-11-06&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.