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 V1057 Cyg: 10-29 (100), 10-30 (100), 10-31 (100), 11-01 (100), 11-02 (100) — by astronomy; check the weather when the night is within four days.

2034-10-29astronomy score per night — click a bar for that night2034-11-27

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-10-29 Sun	100	—	unknown	18:55–00:10 (good, 5.25 h)	87.3° 18:50	10.39	91%	94.7°
2034-10-30 Mon	100	—	unknown	18:55–00:40 (good, 5.75 h)	87.3° 18:45	10.43	84%	102.8°
2034-10-31 Tue	100	—	unknown	18:55–00:45 (good, 5.83 h)	87.3° 18:40	10.47	74%	110.1°
2034-11-01 Wed	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:35	10.5	63%	116.2°
2034-11-02 Thu	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:35	10.54	52%	120.7°
2034-11-03 Fri	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:30	10.58	42%	123.4°
2034-11-04 Sat	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:25	10.61	32%	124.1°
2034-11-05 Sun	100	—	unknown	18:50–00:40 (good, 5.83 h)	87.3° 18:20	10.64	23%	122.8°
2034-11-06 Mon	100	—	unknown	18:45–00:35 (good, 5.83 h)	87.3° 18:15	10.68	15%	119.9°
2034-11-07 Tue	100	—	unknown	18:45–00:35 (good, 5.83 h)	87.3° 18:15	10.71	9%	115.7°
2034-11-08 Wed	100	—	unknown	18:45–00:30 (good, 5.75 h)	87.3° 18:10	10.75	4%	110.5°
2034-11-09 Thu	100	—	unknown	18:45–00:25 (good, 5.67 h)	87.3° 18:05	10.78	1%	104.6°
2034-11-10 Fri	100	—	unknown	18:45–00:20 (good, 5.58 h)	87.3° 18:00	10.81	0%	98.2°
2034-11-11 Sat	100	—	unknown	18:45–00:20 (good, 5.58 h)	87.3° 18:00	10.84	1%	91.6°
2034-11-12 Sun	100	—	unknown	18:40–00:15 (good, 5.58 h)	87.3° 17:55	10.87	3%	85.0°
2034-11-13 Mon	100	—	unknown	18:40–00:10 (good, 5.5 h)	87.3° 17:50	10.9	7%	78.6°
2034-11-14 Tue	100	—	unknown	18:40–00:05 (good, 5.42 h)	87.3° 17:45	10.93	13%	72.5°
2034-11-15 Wed	99	—	unknown	18:40–00:00 (good, 5.33 h)	87.3° 17:40	10.96	20%	66.9°
2034-11-16 Thu	93	—	unknown	18:40–00:00 (good, 5.33 h)	87.3° 17:40	10.99	28%	62.2°
2034-11-17 Fri	86	—	unknown	18:40–23:55 (good, 5.25 h)	87.3° 17:35	11.02	38%	58.6°
2034-11-18 Sat	79	—	unknown	18:40–23:50 (good, 5.17 h)	87.3° 17:30	11.04	47%	56.5°
2034-11-19 Sun	71	—	unknown	18:35–23:20 (good, 4.75 h)	87.3° 17:25	11.07	58%	56.2°
2034-11-20 Mon	59	—	unknown	18:35–21:50 (good, 3.25 h)	87.3° 17:20	11.1	68%	57.9°
2034-11-21 Tue	51	—	unknown	18:35–20:20 (good, 1.75 h)	87.3° 17:20	11.12	78%	61.7°
2034-11-22 Wed	49	—	unknown	18:35–19:45 (good, 1.17 h)	87.3° 17:15	11.15	87%	67.3°
2034-11-23 Thu	50	—	unknown	18:35–20:10 (good, 1.58 h)	87.3° 17:10	11.17	94%	74.3°
2034-11-24 Fri	57	—	unknown	18:35–20:45 (good, 2.17 h)	87.3° 17:05	11.19	98%	82.3°
2034-11-25 Sat	67	—	unknown	18:35–21:35 (good, 3.0 h)	87.3° 17:05	11.21	100%	90.8°
2034-11-26 Sun	80	—	unknown	18:35–22:30 (good, 3.92 h)	87.3° 17:00	11.24	98%	99.3°
2034-11-27 Mon	100	—	unknown	18:35–22:50 (good, 4.25 h)	87.3° 16:55	11.26	94%	107.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-10-29&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.