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 HD 189733: 10-23 (100), 10-24 (100), 10-25 (100), 10-26 (100), 10-27 (100) — by astronomy; check the weather when the night is within four days.

2032-10-23astronomy score per night — click a bar for that night2032-11-21

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-10-23 Sat	100	—	unknown	20:05–00:10 (good, 4.08 h)	71.1° 19:15	10.18	71%	132.8°
2032-10-24 Sun	100	—	unknown	20:00–00:10 (good, 4.17 h)	71.1° 19:10	10.22	62%	139.0°
2032-10-25 Mon	100	—	unknown	20:00–00:10 (good, 4.17 h)	71.1° 19:05	10.26	52%	142.5°
2032-10-26 Tue	100	—	unknown	20:00–00:05 (good, 4.08 h)	71.1° 19:00	10.3	42%	142.8°
2032-10-27 Wed	100	—	unknown	20:00–00:05 (good, 4.08 h)	71.1° 18:55	10.34	33%	140.0°
2032-10-28 Thu	100	—	unknown	19:55–00:00 (good, 4.08 h)	71.1° 18:55	10.37	24%	134.6°
2032-10-29 Fri	100	—	unknown	19:55–23:55 (good, 4.0 h)	71.1° 18:50	10.41	17%	127.5°
2032-10-30 Sat	100	—	unknown	19:55–23:50 (good, 3.92 h)	71.1° 18:45	10.45	10%	119.2°
2032-10-31 Sun	100	—	unknown	18:55–22:45 (good, 3.83 h)	71.1° 17:40	10.49	5%	110.2°
2032-11-01 Mon	100	—	unknown	18:50–22:45 (good, 3.92 h)	71.1° 17:35	10.52	2%	100.6°
2032-11-02 Tue	99	—	unknown	18:50–22:40 (good, 3.83 h)	71.1° 17:35	10.56	0%	90.6°
2032-11-03 Wed	99	—	unknown	18:50–22:35 (good, 3.75 h)	71.1° 17:30	10.59	0%	80.5°
2032-11-04 Thu	97	—	unknown	18:50–22:30 (good, 3.67 h)	71.1° 17:25	10.63	3%	70.4°
2032-11-05 Fri	95	—	unknown	18:50–22:30 (good, 3.67 h)	71.1° 17:20	10.66	8%	60.5°
2032-11-06 Sat	89	—	unknown	18:45–22:25 (good, 3.67 h)	71.1° 17:20	10.7	14%	51.4°
2032-11-07 Sun	79	—	unknown	18:45–22:20 (good, 3.58 h)	71.1° 17:15	10.73	23%	43.6°
2032-11-08 Mon	67	—	unknown	18:45–22:15 (good, 3.5 h)	71.1° 17:10	10.76	33%	38.4°
2032-11-09 Tue	53	—	unknown	18:45–21:55 (good, 3.17 h)	71.1° 17:05	10.79	44%	37.0°
2032-11-10 Wed	42	—	unknown	18:45–21:00 (good, 2.25 h)	71.1° 17:00	10.83	55%	40.0°
2032-11-11 Thu	35	—	unknown	18:40–19:25 (good, 0.75 h)	71.1° 17:00	10.86	66%	46.7°
2032-11-12 Fri	32	—	unknown	18:40–18:50 (good, 0.17 h)	71.1° 16:55	10.89	77%	55.7°
2032-11-13 Sat	32	—	unknown	18:40–19:00 (good, 0.33 h)	71.1° 16:50	10.92	86%	66.1°
2032-11-14 Sun	35	—	unknown	18:40–19:30 (good, 0.83 h)	71.1° 16:45	10.95	93%	77.2°
2032-11-15 Mon	41	—	unknown	18:40–20:15 (good, 1.58 h)	71.1° 16:40	10.97	98%	88.6°
2032-11-16 Tue	49	—	unknown	18:40–21:10 (good, 2.5 h)	71.1° 16:40	11.0	100%	99.9°
2032-11-17 Wed	57	—	unknown	18:40–21:20 (good, 2.67 h)	71.1° 16:35	11.03	99%	110.7°
2032-11-18 Thu	65	—	unknown	18:35–21:25 (good, 2.83 h)	71.1° 16:30	11.06	97%	120.8°
2032-11-19 Fri	72	—	unknown	18:35–21:25 (good, 2.83 h)	71.1° 16:25	11.08	92%	129.7°
2032-11-20 Sat	72	—	unknown	18:35–21:20 (good, 2.75 h)	71.1° 16:25	11.11	85%	136.8°
2032-11-21 Sun	72	—	unknown	18:35–21:20 (good, 2.75 h)	71.1° 16:20	11.13	78%	141.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-23&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.