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 Vega: 11-01 (89), 10-31 (88), 10-30 (87), 11-02 (87), 11-03 (86) — by astronomy; check the weather when the night is within four days.

2034-10-23astronomy score per night — click a bar for that night2034-11-21

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-10-23 Mon	45	—	unknown	20:05–21:50 (good, 1.75 h)	87.1° 17:50	10.16	83%	73.8°
2034-10-24 Tue	47	—	unknown	20:00–21:50 (good, 1.83 h)	87.1° 17:45	10.2	90%	81.0°
2034-10-25 Wed	50	—	unknown	20:00–22:10 (good, 2.17 h)	87.1° 17:45	10.24	96%	88.9°
2034-10-26 Thu	56	—	unknown	20:00–22:40 (good, 2.67 h)	87.1° 17:40	10.28	99%	96.9°
2034-10-27 Fri	63	—	unknown	20:00–23:05 (good, 3.08 h)	87.1° 17:35	10.32	100%	104.8°
2034-10-28 Sat	71	—	unknown	19:55–23:10 (good, 3.25 h)	87.1° 17:30	10.35	97%	111.9°
2034-10-29 Sun	85	—	unknown	18:55–22:15 (good, 3.33 h)	87.1° 16:25	10.39	91%	117.6°
2034-10-30 Mon	87	—	unknown	18:55–22:15 (good, 3.33 h)	87.1° 16:25	10.43	84%	121.5°
2034-10-31 Tue	88	—	unknown	18:55–22:10 (good, 3.25 h)	87.1° 16:20	10.47	74%	123.0°
2034-11-01 Wed	89	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.5	63%	122.3°
2034-11-02 Thu	87	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.54	52%	119.5°
2034-11-03 Fri	86	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:10	10.58	42%	115.2°
2034-11-04 Sat	84	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:05	10.61	32%	109.8°
2034-11-05 Sun	82	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.64	23%	103.7°
2034-11-06 Mon	82	—	unknown	18:45–21:55 (good, 3.17 h)	87.1° 15:55	10.68	15%	97.2°
2034-11-07 Tue	80	—	unknown	18:45–21:50 (good, 3.08 h)	87.1° 15:50	10.71	9%	90.5°
2034-11-08 Wed	78	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:50	10.75	4%	84.0°
2034-11-09 Thu	77	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:45	10.78	1%	77.6°
2034-11-10 Fri	75	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.81	0%	71.8°
2034-11-11 Sat	73	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:35	10.84	1%	66.6°
2034-11-12 Sun	73	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.87	3%	62.3°
2034-11-13 Mon	69	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:30	10.9	7%	59.1°
2034-11-14 Tue	64	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.93	13%	57.4°
2034-11-15 Wed	59	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.96	20%	57.2°
2034-11-16 Thu	52	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:15	10.99	28%	58.6°
2034-11-17 Fri	46	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:10	11.02	38%	61.6°
2034-11-18 Sat	40	—	unknown	18:40–20:45 (good, 2.08 h)	87.1° 15:10	11.04	47%	66.0°
2034-11-19 Sun	36	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 15:05	11.07	58%	71.6°
2034-11-20 Mon	33	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 15:00	11.1	68%	78.2°
2034-11-21 Tue	32	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:55	11.12	78%	85.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-10-23&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.