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: 11-14 (11), 11-15 (11), 11-13 (9), 11-12 (8), 11-11 (6) — by astronomy; check the weather when the night is within four days.

2032-10-17astronomy score per night — click a bar for that night2032-11-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-10-17 Sun	0	—	unknown	—	50.2° 12:05	9.93	99%	170.3°
2032-10-18 Mon	0	—	unknown	—	50.2° 12:00	9.97	100%	157.5°
2032-10-19 Tue	0	—	unknown	—	50.2° 11:55	10.01	98%	143.5°
2032-10-20 Wed	0	—	unknown	—	50.2° 11:50	10.06	94%	129.6°
2032-10-21 Thu	0	—	unknown	—	50.2° 11:45	10.1	88%	116.0°
2032-10-22 Fri	0	—	unknown	—	50.2° 11:45	10.14	80%	102.8°
2032-10-23 Sat	0	—	unknown	—	50.2° 11:40	10.18	71%	90.1°
2032-10-24 Sun	0	—	unknown	—	50.2° 11:35	10.22	62%	77.7°
2032-10-25 Mon	0	—	unknown	—	50.2° 11:30	10.26	52%	65.6°
2032-10-26 Tue	0	—	unknown	—	50.2° 11:25	10.3	42%	53.7°
2032-10-27 Wed	0	—	unknown	—	50.2° 11:25	10.34	33%	42.0°
2032-10-28 Thu	0	—	unknown	—	50.2° 11:20	10.37	24%	30.4°
2032-10-29 Fri	0	—	unknown	—	50.2° 11:15	10.41	17%	19.1°
2032-10-30 Sat	0	—	unknown	—	50.2° 10:10	10.45	10%	9.1°
2032-10-31 Sun	0	—	unknown	—	50.2° 10:05	10.49	5%	9.3°
2032-11-01 Mon	0	—	unknown	—	50.2° 10:05	10.52	2%	19.7°
2032-11-02 Tue	1	—	unknown	—	50.2° 10:00	10.56	0%	31.7°
2032-11-03 Wed	1	—	unknown	—	50.2° 09:55	10.59	0%	44.2°
2032-11-04 Thu	1	—	unknown	—	50.2° 09:50	10.63	3%	56.9°
2032-11-05 Fri	1	—	unknown	—	50.2° 09:45	10.66	8%	70.0°
2032-11-06 Sat	1	—	unknown	05:55–06:00 (marginal, 0.08 h)	50.2° 09:45	10.7	14%	83.2°
2032-11-07 Sun	3	—	unknown	05:25–05:30 (marginal, 0.08 h)	50.2° 09:40	10.73	23%	96.7°
2032-11-08 Mon	3	—	unknown	05:50–06:05 (marginal, 0.25 h)	50.2° 09:35	10.76	33%	110.3°
2032-11-09 Tue	4	—	unknown	05:15–05:30 (marginal, 0.25 h)	50.2° 09:30	10.79	44%	124.0°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-17&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.