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 (74), 07-04 (70), 07-03 (68), 07-02 (66), 07-01 (64) — by astronomy; check the weather when the night is within four days.

2038-06-06astronomy score per night — click a bar for that night2038-07-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2038-06-06 Sun	25	—	unknown	03:00–03:40 (good, 0.67 h)	89.6° 09:05	4.63	15%	92.4°
2038-06-07 Mon	26	—	unknown	02:55–03:40 (good, 0.75 h)	89.7° 09:00	4.6	23%	102.6°
2038-06-08 Tue	27	—	unknown	02:50–03:40 (good, 0.83 h)	89.8° 08:55	4.58	33%	112.8°
2038-06-09 Wed	28	—	unknown	02:45–03:40 (good, 0.92 h)	89.7° 08:50	4.55	44%	122.6°
2038-06-10 Thu	30	—	unknown	02:45–03:40 (good, 0.92 h)	89.5° 08:45	4.53	55%	131.3°
2038-06-11 Fri	31	—	unknown	02:45–03:40 (good, 0.92 h)	89.6° 08:45	4.51	66%	138.0°
2038-06-12 Sat	32	—	unknown	02:45–03:40 (good, 0.92 h)	89.8° 08:40	4.49	77%	141.5°
2038-06-13 Sun	29	—	unknown	02:40–03:40 (good, 1.0 h)	89.8° 08:35	4.48	86%	140.5°
2038-06-14 Mon	29	—	unknown	02:40–03:40 (good, 1.0 h)	89.7° 08:30	4.46	93%	135.2°
2038-06-15 Tue	30	—	unknown	02:35–03:40 (good, 1.08 h)	89.5° 08:30	4.45	98%	127.0°
2038-06-16 Wed	30	—	unknown	02:35–03:40 (good, 1.08 h)	89.7° 08:25	4.44	100%	117.1°
2038-06-17 Thu	27	—	unknown	02:35–03:40 (good, 1.08 h)	89.8° 08:20	4.43	99%	106.5°
2038-06-18 Fri	24	—	unknown	02:40–03:40 (good, 1.0 h)	89.7° 08:15	4.43	96%	95.7°
2038-06-19 Sat	23	—	unknown	02:50–03:40 (good, 0.83 h)	89.6° 08:10	4.42	90%	85.0°
2038-06-20 Sun	23	—	unknown	03:05–03:40 (good, 0.58 h)	89.5° 08:10	4.42	83%	74.8°
2038-06-21 Mon	23	—	unknown	03:00–03:40 (good, 0.67 h)	89.7° 08:05	4.42	74%	65.2°
2038-06-22 Tue	25	—	unknown	02:25–03:40 (good, 1.25 h)	89.8° 08:00	4.43	65%	56.5°
2038-06-23 Wed	28	—	unknown	02:15–03:40 (good, 1.42 h)	89.7° 07:55	4.43	56%	48.9°
2038-06-24 Thu	33	—	unknown	02:05–03:40 (good, 1.58 h)	89.5° 07:50	4.44	46%	43.0°
2038-06-25 Fri	42	—	unknown	01:45–03:40 (good, 1.92 h)	89.6° 07:50	4.45	37%	39.3°
2038-06-26 Sat	48	—	unknown	01:40–03:40 (good, 2.0 h)	89.7° 07:45	4.46	28%	38.4°
2038-06-27 Sun	52	—	unknown	01:35–03:40 (good, 2.08 h)	89.8° 07:40	4.47	20%	40.6°
2038-06-28 Mon	57	—	unknown	01:35–03:40 (good, 2.08 h)	89.7° 07:35	4.48	13%	45.5°
2038-06-29 Tue	59	—	unknown	01:30–03:40 (good, 2.17 h)	89.5° 07:30	4.5	7%	52.3°
2038-06-30 Wed	63	—	unknown	01:25–03:45 (good, 2.33 h)	89.7° 07:30	4.52	3%	60.5°
2038-07-01 Thu	64	—	unknown	01:20–03:45 (good, 2.42 h)	89.8° 07:25	4.54	0%	69.6°
2038-07-02 Fri	66	—	unknown	01:15–03:45 (good, 2.5 h)	89.8° 07:20	4.56	0%	79.5°
2038-07-03 Sat	68	—	unknown	01:15–03:45 (good, 2.5 h)	89.6° 07:15	4.59	2%	89.7°
2038-07-04 Sun	70	—	unknown	01:10–03:45 (good, 2.58 h)	89.5° 07:15	4.61	6%	100.1°
2038-07-05 Mon	74	—	unknown	01:05–03:50 (good, 2.75 h)	89.7° 07:10	4.64	13%	110.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2038-06-06&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.