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: 11-17 (100), 11-18 (100), 11-19 (100), 11-20 (100), 11-21 (100) — by astronomy; check the weather when the night is within four days.

2035-11-10astronomy score per night — click a bar for that night2035-12-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-11-10 Sat	61	—	unknown	18:45–21:45 (good, 3.0 h)	87.3° 18:05	10.8	75%	59.3°
2035-11-11 Sun	55	—	unknown	18:45–20:00 (good, 1.25 h)	87.3° 18:00	10.83	84%	62.5°
2035-11-12 Mon	53	—	unknown	18:40–19:40 (good, 1.0 h)	87.3° 17:55	10.86	91%	67.3°
2035-11-13 Tue	56	—	unknown	18:40–20:30 (good, 1.83 h)	87.3° 17:50	10.89	96%	73.4°
2035-11-14 Wed	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.3° 17:45	10.92	99%	80.5°
2035-11-15 Thu	74	—	unknown	18:40–21:55 (good, 3.25 h)	87.3° 17:45	10.95	100%	88.2°
2035-11-16 Fri	83	—	unknown	18:40–22:50 (good, 4.17 h)	87.3° 17:40	10.98	97%	96.0°
2035-11-17 Sat	100	—	unknown	18:40–23:25 (good, 4.75 h)	87.3° 17:35	11.01	92%	103.6°
2035-11-18 Sun	100	—	unknown	18:40–23:35 (good, 4.92 h)	87.3° 17:30	11.04	84%	110.5°
2035-11-19 Mon	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.3° 17:25	11.06	75%	116.1°
2035-11-20 Tue	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.3° 17:25	11.09	64%	120.1°
2035-11-21 Wed	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.3° 17:20	11.11	53%	122.0°
2035-11-22 Thu	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.3° 17:15	11.14	42%	121.8°
2035-11-23 Fri	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.3° 17:10	11.16	32%	119.8°
2035-11-24 Sat	100	—	unknown	18:35–23:25 (good, 4.83 h)	87.3° 17:10	11.19	22%	116.1°
2035-11-25 Sun	100	—	unknown	18:35–23:25 (good, 4.83 h)	87.3° 17:05	11.21	15%	111.2°
2035-11-26 Mon	100	—	unknown	18:35–23:20 (good, 4.75 h)	87.3° 17:00	11.23	8%	105.4°
2035-11-27 Tue	100	—	unknown	18:35–23:15 (good, 4.67 h)	87.3° 16:55	11.25	4%	99.2°
2035-11-28 Wed	100	—	unknown	18:35–23:10 (good, 4.58 h)	87.3° 16:50	11.27	1%	92.7°
2035-11-29 Thu	100	—	unknown	18:35–23:10 (good, 4.58 h)	87.3° 16:50	11.29	0%	86.2°
2035-11-30 Fri	100	—	unknown	18:35–23:05 (good, 4.5 h)	87.3° 16:45	11.31	1%	80.0°
2035-12-01 Sat	100	—	unknown	18:35–23:00 (good, 4.42 h)	87.3° 16:40	11.33	4%	74.1°
2035-12-02 Sun	100	—	unknown	18:35–22:55 (good, 4.33 h)	87.3° 16:35	11.34	9%	68.8°
2035-12-03 Mon	95	—	unknown	18:35–22:50 (good, 4.25 h)	87.3° 16:30	11.36	15%	64.3°
2035-12-04 Tue	92	—	unknown	18:35–22:50 (good, 4.25 h)	87.3° 16:30	11.38	22%	60.9°
2035-12-05 Wed	87	—	unknown	18:35–22:45 (good, 4.17 h)	87.3° 16:25	11.39	30%	58.7°
2035-12-06 Thu	75	—	unknown	18:35–22:25 (good, 3.83 h)	87.3° 16:20	11.4	39%	58.0°
2035-12-07 Fri	63	—	unknown	18:35–22:15 (good, 3.67 h)	87.3° 16:15	11.42	49%	58.9°
2035-12-08 Sat	54	—	unknown	18:35–22:00 (good, 3.42 h)	87.3° 16:15	11.43	59%	61.4°
2035-12-09 Sun	47	—	unknown	18:35–20:35 (good, 2.0 h)	87.3° 16:10	11.44	69%	65.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-11-10&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.