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: 11-19 (62), 11-17 (61), 11-18 (61), 11-20 (61), 11-21 (59) — by astronomy; check the weather when the night is within four days.

2035-11-16astronomy score per night — click a bar for that night2035-12-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-11-16 Fri	54	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:15	10.98	97%	118.3°
2035-11-17 Sat	61	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:15	11.01	92%	121.3°
2035-11-18 Sun	61	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:10	11.04	84%	122.0°
2035-11-19 Mon	62	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.06	75%	120.4°
2035-11-20 Tue	61	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.09	64%	116.8°
2035-11-21 Wed	59	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 15:00	11.11	53%	111.6°
2035-11-22 Thu	57	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.14	42%	105.5°
2035-11-23 Fri	56	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:50	11.16	32%	98.8°
2035-11-24 Sat	54	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:45	11.19	22%	91.9°
2035-11-25 Sun	53	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.21	15%	85.1°
2035-11-26 Mon	52	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:40	11.23	8%	78.5°
2035-11-27 Tue	50	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.25	4%	72.5°
2035-11-28 Wed	48	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:30	11.27	1%	67.2°
2035-11-29 Thu	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.29	0%	63.0°
2035-11-30 Fri	45	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.31	1%	59.9°
2035-12-01 Sat	44	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.33	4%	58.3°
2035-12-02 Sun	40	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.34	9%	58.2°
2035-12-03 Mon	37	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.36	15%	59.6°
2035-12-04 Tue	33	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:05	11.38	22%	62.4°
2035-12-05 Wed	29	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:05	11.39	30%	66.3°
2035-12-06 Thu	26	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:00	11.4	39%	71.3°
2035-12-07 Fri	23	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:55	11.42	49%	77.0°
2035-12-08 Sat	21	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:50	11.43	59%	83.4°
2035-12-09 Sun	20	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:45	11.44	69%	90.3°
2035-12-10 Mon	19	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:45	11.45	78%	97.3°
2035-12-11 Tue	19	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:40	11.46	87%	104.3°
2035-12-12 Wed	19	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:35	11.47	93%	110.8°
2035-12-13 Thu	20	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:30	11.48	98%	116.3°
2035-12-14 Fri	21	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:25	11.48	100%	120.2°
2035-12-15 Sat	20	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:25	11.49	99%	121.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-11-16&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.