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: 11-14 (67), 11-15 (67), 11-16 (66), 11-17 (65), 11-18 (63) — by astronomy; check the weather when the night is within four days.

2030-11-14astronomy score per night — click a bar for that night2030-12-13

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-11-14 Thu	67	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:25	10.93	81%	121.5°
2030-11-15 Fri	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.96	73%	121.7°
2030-11-16 Sat	66	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	10.99	64%	120.4°
2030-11-17 Sun	65	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.02	54%	117.6°
2030-11-18 Mon	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.04	44%	113.4°
2030-11-19 Tue	62	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.07	34%	108.1°
2030-11-20 Wed	60	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.1	24%	101.7°
2030-11-21 Thu	59	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.12	16%	94.6°
2030-11-22 Fri	57	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:55	11.14	8%	87.1°
2030-11-23 Sat	56	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:50	11.17	3%	79.5°
2030-11-24 Sun	54	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:45	11.19	0%	72.3°
2030-11-25 Mon	52	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.21	1%	66.0°
2030-11-26 Tue	51	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.24	4%	61.3°
2030-11-27 Wed	47	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:35	11.26	10%	58.7°
2030-11-28 Thu	42	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:30	11.28	18%	58.4°
2030-11-29 Fri	36	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:25	11.3	28%	60.3°
2030-11-30 Sat	31	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:20	11.31	39%	64.0°
2030-12-01 Sun	27	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:15	11.33	50%	69.0°
2030-12-02 Mon	23	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:15	11.35	60%	74.8°
2030-12-03 Tue	21	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 14:10	11.36	70%	81.1°
2030-12-04 Wed	20	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 14:05	11.38	78%	87.6°
2030-12-05 Thu	20	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 14:00	11.39	86%	94.0°
2030-12-06 Fri	21	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 14:00	11.41	92%	100.2°
2030-12-07 Sat	22	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:55	11.42	96%	106.1°
2030-12-08 Sun	23	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:50	11.43	99%	111.3°
2030-12-09 Mon	24	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:45	11.44	100%	115.7°
2030-12-10 Tue	25	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:40	11.45	99%	119.1°
2030-12-11 Wed	25	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:40	11.46	96%	121.2°
2030-12-12 Thu	27	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:35	11.47	92%	121.8°
2030-12-13 Fri	26	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	86%	120.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-11-14&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.