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 Andromeda Galaxy: 07-05 (73), 07-04 (70), 07-03 (68), 07-02 (66), 07-01 (65) — by astronomy; check the weather when the night is within four days.

2033-06-06astronomy score per night — click a bar for that night2033-07-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-06-06 Mon	25	—	unknown	03:00–03:40 (good, 0.67 h)	89.6° 09:00	4.63	68%	142.6°
2033-06-07 Tue	26	—	unknown	03:00–03:40 (good, 0.67 h)	89.5° 09:00	4.6	76%	145.8°
2033-06-08 Wed	27	—	unknown	03:00–03:40 (good, 0.67 h)	89.7° 08:55	4.57	84%	145.4°
2033-06-09 Thu	25	—	unknown	02:55–03:40 (good, 0.75 h)	89.8° 08:50	4.55	91%	141.6°
2033-06-10 Fri	25	—	unknown	02:55–03:40 (good, 0.75 h)	89.7° 08:45	4.53	96%	134.9°
2033-06-11 Sat	25	—	unknown	02:50–03:40 (good, 0.83 h)	89.5° 08:40	4.51	99%	126.4°
2033-06-12 Sun	25	—	unknown	02:50–03:40 (good, 0.83 h)	89.6° 08:40	4.49	100%	116.6°
2033-06-13 Mon	23	—	unknown	02:55–03:40 (good, 0.75 h)	89.7° 08:35	4.48	99%	106.0°
2033-06-14 Tue	20	—	unknown	02:55–03:40 (good, 0.75 h)	89.8° 08:30	4.46	95%	95.0°
2033-06-15 Wed	19	—	unknown	03:35–03:40 (good, 0.08 h)	89.6° 08:25	4.45	90%	83.6°
2033-06-16 Thu	18	—	unknown	01:50–03:40 (marginal, 1.83 h)	89.5° 08:20	4.44	82%	72.3°
2033-06-17 Fri	19	—	unknown	01:45–03:40 (marginal, 1.92 h)	89.6° 08:20	4.43	73%	61.2°
2033-06-18 Sat	21	—	unknown	03:30–03:40 (good, 0.17 h)	89.7° 08:15	4.43	62%	50.9°
2033-06-19 Sun	24	—	unknown	02:35–03:40 (good, 1.08 h)	89.7° 08:10	4.42	51%	42.0°
2033-06-20 Mon	30	—	unknown	02:20–03:40 (good, 1.33 h)	89.6° 08:05	4.42	39%	35.8°
2033-06-21 Tue	39	—	unknown	02:00–03:40 (good, 1.67 h)	89.5° 08:05	4.42	28%	34.1°
2033-06-22 Wed	45	—	unknown	01:55–03:40 (good, 1.75 h)	89.7° 08:00	4.43	19%	37.3°
2033-06-23 Thu	48	—	unknown	01:50–03:40 (good, 1.83 h)	89.8° 07:55	4.43	11%	44.4°
2033-06-24 Fri	50	—	unknown	01:45–03:40 (good, 1.92 h)	89.7° 07:50	4.44	5%	53.7°
2033-06-25 Sat	53	—	unknown	01:45–03:40 (good, 1.92 h)	89.5° 07:45	4.45	1%	64.1°
2033-06-26 Sun	55	—	unknown	01:40–03:40 (good, 2.0 h)	89.6° 07:45	4.46	0%	75.0°
2033-06-27 Mon	56	—	unknown	01:35–03:40 (good, 2.08 h)	89.7° 07:40	4.47	2%	85.9°
2033-06-28 Tue	58	—	unknown	01:30–03:40 (good, 2.17 h)	89.8° 07:35	4.49	5%	96.7°
2033-06-29 Wed	60	—	unknown	01:30–03:40 (good, 2.17 h)	89.6° 07:30	4.5	10%	107.1°
2033-06-30 Thu	63	—	unknown	01:25–03:45 (good, 2.33 h)	89.5° 07:25	4.52	17%	116.9°
2033-07-01 Fri	65	—	unknown	01:20–03:45 (good, 2.42 h)	89.6° 07:25	4.54	25%	126.1°
2033-07-02 Sat	66	—	unknown	01:15–03:45 (good, 2.5 h)	89.7° 07:20	4.57	33%	134.2°
2033-07-03 Sun	68	—	unknown	01:10–03:45 (good, 2.58 h)	89.7° 07:15	4.59	43%	140.7°
2033-07-04 Mon	70	—	unknown	01:10–03:45 (good, 2.58 h)	89.6° 07:10	4.62	52%	144.8°
2033-07-05 Tue	73	—	unknown	01:10–03:50 (good, 2.67 h)	89.5° 07:10	4.65	62%	145.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-06-06&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.