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: 02-08 (53), 02-10 (53), 02-09 (52), 02-07 (51), 02-06 (50) — by astronomy; check the weather when the night is within four days.

2033-01-13astronomy score per night — click a bar for that night2033-02-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-01-13 Thu	19	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:20	11.26	97%	122.4°
2033-01-14 Fri	19	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:20	11.24	99%	123.2°
2033-01-15 Sat	19	—	unknown	05:30–06:10 (good, 0.67 h)	87.1° 11:15	11.22	100%	122.1°
2033-01-16 Sun	20	—	unknown	05:30–06:10 (good, 0.67 h)	87.1° 11:10	11.2	98%	119.5°
2033-01-17 Mon	20	—	unknown	05:30–06:10 (good, 0.67 h)	87.1° 11:05	11.17	94%	115.5°
2033-01-18 Tue	20	—	unknown	05:25–06:10 (good, 0.75 h)	87.1° 11:05	11.15	89%	110.5°
2033-01-19 Wed	19	—	unknown	05:25–06:10 (good, 0.75 h)	87.1° 11:00	11.12	83%	104.8°
2033-01-20 Thu	20	—	unknown	05:25–06:10 (good, 0.75 h)	87.1° 10:55	11.1	75%	98.7°
2033-01-21 Fri	20	—	unknown	05:20–06:05 (good, 0.75 h)	87.1° 10:50	11.07	67%	92.3°
2033-01-22 Sat	21	—	unknown	05:15–06:05 (good, 0.83 h)	87.1° 10:45	11.05	58%	85.8°
2033-01-23 Sun	24	—	unknown	05:05–06:05 (good, 1.0 h)	87.1° 10:45	11.02	48%	79.3°
2033-01-24 Mon	26	—	unknown	05:00–06:05 (good, 1.08 h)	87.1° 10:40	10.99	38%	73.0°
2033-01-25 Tue	29	—	unknown	04:50–06:05 (good, 1.25 h)	87.1° 10:35	10.96	29%	67.2°
2033-01-26 Wed	32	—	unknown	04:45–06:05 (good, 1.33 h)	87.1° 10:30	10.93	20%	62.3°
2033-01-27 Thu	36	—	unknown	04:35–06:05 (good, 1.5 h)	87.1° 10:25	10.91	12%	58.6°
2033-01-28 Fri	40	—	unknown	04:30–06:05 (good, 1.58 h)	87.1° 10:25	10.87	6%	56.9°
2033-01-29 Sat	40	—	unknown	04:25–06:00 (good, 1.58 h)	87.1° 10:20	10.84	2%	57.4°
2033-01-30 Sun	42	—	unknown	04:20–06:00 (good, 1.67 h)	87.1° 10:15	10.81	0%	60.2°
2033-01-31 Mon	43	—	unknown	04:15–06:00 (good, 1.75 h)	87.1° 10:10	10.78	2%	65.2°
2033-02-01 Tue	44	—	unknown	04:15–06:00 (good, 1.75 h)	87.1° 10:10	10.75	6%	71.7°
2033-02-02 Wed	45	—	unknown	04:10–06:00 (good, 1.83 h)	87.1° 10:05	10.71	13%	79.2°
2033-02-03 Thu	47	—	unknown	04:05–06:00 (good, 1.92 h)	87.1° 10:00	10.68	22%	87.1°
2033-02-04 Fri	47	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:55	10.65	32%	95.0°
2033-02-05 Sat	49	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:50	10.61	43%	102.4°
2033-02-06 Sun	50	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:50	10.58	54%	109.2°
2033-02-07 Mon	51	—	unknown	03:50–05:55 (good, 2.08 h)	87.1° 09:45	10.54	65%	114.9°
2033-02-08 Tue	53	—	unknown	03:45–05:55 (good, 2.17 h)	87.1° 09:40	10.5	74%	119.3°
2033-02-09 Wed	52	—	unknown	03:50–05:50 (good, 2.0 h)	87.1° 09:35	10.47	82%	122.2°
2033-02-10 Thu	53	—	unknown	03:45–05:50 (good, 2.08 h)	87.1° 09:30	10.43	89%	123.3°
2033-02-11 Fri	48	—	unknown	03:45–05:50 (good, 2.08 h)	87.1° 09:30	10.39	95%	122.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-01-13&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.