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: 11-17 (62), 11-18 (62), 11-19 (62), 11-16 (61), 11-20 (60) — by astronomy; check the weather when the night is within four days.

2046-11-11astronomy score per night — click a bar for that night2046-12-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-11-11 Sun	37	—	unknown	18:45–20:10 (good, 1.42 h)	87.1° 15:35	10.84	97%	92.3°
2046-11-12 Mon	42	—	unknown	18:40–20:35 (good, 1.92 h)	87.1° 15:30	10.87	99%	97.8°
2046-11-13 Tue	45	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:30	10.91	100%	103.1°
2046-11-14 Wed	49	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:25	10.93	98%	107.9°
2046-11-15 Thu	52	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:20	10.96	95%	112.1°
2046-11-16 Fri	61	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:15	10.99	90%	115.2°
2046-11-17 Sat	62	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:10	11.02	83%	117.2°
2046-11-18 Sun	62	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.05	74%	117.6°
2046-11-19 Mon	62	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.07	64%	116.5°
2046-11-20 Tue	60	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.1	54%	113.8°
2046-11-21 Wed	59	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.12	43%	109.7°
2046-11-22 Thu	58	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:55	11.15	32%	104.3°
2046-11-23 Fri	56	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:50	11.17	21%	98.2°
2046-11-24 Sat	54	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:45	11.19	12%	91.5°
2046-11-25 Sun	52	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.22	6%	84.6°
2046-11-26 Mon	51	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.24	2%	78.1°
2046-11-27 Tue	50	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:35	11.26	0%	72.2°
2046-11-28 Wed	48	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:30	11.28	1%	67.5°
2046-11-29 Thu	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.3	5%	64.2°
2046-11-30 Fri	42	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.32	11%	62.5°
2046-12-01 Sat	38	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:15	11.33	19%	62.4°
2046-12-02 Sun	33	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:15	11.35	27%	63.9°
2046-12-03 Mon	29	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:10	11.37	36%	66.6°
2046-12-04 Tue	25	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 14:05	11.38	46%	70.3°
2046-12-05 Wed	22	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 14:00	11.4	56%	74.7°
2046-12-06 Thu	20	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 14:00	11.41	65%	79.7°
2046-12-07 Fri	18	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:55	11.42	74%	85.0°
2046-12-08 Sat	17	—	unknown	18:35–18:55 (good, 0.33 h)	87.1° 13:50	11.43	81%	90.5°
2046-12-09 Sun	17	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:45	11.44	88%	96.0°
2046-12-10 Mon	18	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:40	11.45	94%	101.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-11-11&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.