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: 01-30 (42), 01-28 (40), 01-29 (40), 01-27 (36), 01-26 (32) — by astronomy; check the weather when the night is within four days.

2033-01-01astronomy score per night — click a bar for that night2033-01-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-01-01 Sat	9	—	unknown	05:45–06:10 (marginal, 0.42 h)	87.1° 12:15	11.45	0%	56.8°
2033-01-02 Sun	10	—	unknown	05:40–06:45 (marginal, 1.08 h)	87.1° 12:10	11.44	3%	58.3°
2033-01-03 Mon	11	—	unknown	05:35–06:45 (marginal, 1.17 h)	87.1° 12:05	11.42	9%	61.9°
2033-01-04 Tue	12	—	unknown	06:05–06:10 (good, 0.08 h)	87.1° 12:00	11.41	16%	67.3°
2033-01-05 Wed	12	—	unknown	06:00–06:10 (good, 0.17 h)	87.1° 11:55	11.4	26%	74.0°
2033-01-06 Thu	13	—	unknown	05:55–06:10 (good, 0.25 h)	87.1° 11:50	11.38	36%	81.4°
2033-01-07 Fri	14	—	unknown	05:50–06:10 (good, 0.33 h)	87.1° 11:45	11.37	48%	89.0°
2033-01-08 Sat	16	—	unknown	05:50–06:10 (good, 0.33 h)	87.1° 11:40	11.35	59%	96.6°
2033-01-09 Sun	17	—	unknown	05:45–06:10 (good, 0.42 h)	87.1° 11:40	11.34	69%	103.8°
2033-01-10 Mon	18	—	unknown	05:40–06:10 (good, 0.5 h)	87.1° 11:35	11.32	79%	110.3°
2033-01-11 Tue	20	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:30	11.3	87%	115.8°
2033-01-12 Wed	21	—	unknown	05:40–06:10 (good, 0.5 h)	87.1° 11:25	11.28	93%	119.9°
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°

Download: CSV · JSON

💡 API

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