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: 07-11 (89), 07-10 (87), 07-09 (85), 07-08 (80), 07-07 (79) — by astronomy; check the weather when the night is within four days.

2032-06-12astronomy score per night — click a bar for that night2032-07-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-06-12 Sat	33	—	unknown	02:35–03:40 (good, 1.08 h)	89.5° 08:35	4.49	22%	109.2°
2032-06-13 Sun	35	—	unknown	02:30–03:40 (good, 1.17 h)	89.6° 08:35	4.47	30%	118.8°
2032-06-14 Mon	36	—	unknown	02:25–03:40 (good, 1.25 h)	89.7° 08:30	4.46	39%	127.9°
2032-06-15 Tue	37	—	unknown	02:20–03:40 (good, 1.33 h)	89.7° 08:25	4.45	48%	136.2°
2032-06-16 Wed	39	—	unknown	02:20–03:40 (good, 1.33 h)	89.6° 08:20	4.44	58%	142.9°
2032-06-17 Thu	40	—	unknown	02:15–03:40 (good, 1.42 h)	89.5° 08:20	4.43	67%	147.1°
2032-06-18 Fri	41	—	unknown	02:15–03:40 (good, 1.42 h)	89.6° 08:15	4.43	76%	147.3°
2032-06-19 Sat	41	—	unknown	02:15–03:40 (good, 1.42 h)	89.7° 08:10	4.42	85%	143.3°
2032-06-20 Sun	38	—	unknown	02:10–03:40 (good, 1.5 h)	89.7° 08:05	4.42	92%	135.8°
2032-06-21 Mon	38	—	unknown	02:10–03:40 (good, 1.5 h)	89.6° 08:00	4.42	97%	126.1°
2032-06-22 Tue	36	—	unknown	02:10–03:40 (good, 1.5 h)	89.5° 08:00	4.43	100%	114.9°
2032-06-23 Wed	32	—	unknown	02:15–03:40 (good, 1.42 h)	89.7° 07:55	4.43	100%	103.0°
2032-06-24 Thu	27	—	unknown	02:40–03:40 (good, 1.0 h)	89.8° 07:50	4.44	97%	90.6°
2032-06-25 Fri	24	—	unknown	03:35–03:40 (good, 0.08 h)	89.7° 07:45	4.45	91%	78.1°
2032-06-26 Sat	23	—	unknown	01:10–03:40 (marginal, 2.5 h)	89.5° 07:40	4.46	84%	65.9°
2032-06-27 Sun	24	—	unknown	01:05–03:40 (marginal, 2.58 h)	89.6° 07:40	4.48	74%	54.5°
2032-06-28 Mon	27	—	unknown	00:55–03:40 (marginal, 2.75 h)	89.7° 07:35	4.49	63%	44.3°
2032-06-29 Tue	32	—	unknown	01:55–03:45 (good, 1.83 h)	89.7° 07:30	4.51	52%	36.6°
2032-06-30 Wed	40	—	unknown	01:40–03:45 (good, 2.08 h)	89.6° 07:25	4.53	41%	32.6°
2032-07-01 Thu	51	—	unknown	01:20–03:45 (good, 2.42 h)	89.5° 07:20	4.55	30%	33.5°
2032-07-02 Fri	59	—	unknown	01:15–03:45 (good, 2.5 h)	89.6° 07:20	4.57	21%	38.6°
2032-07-03 Sat	66	—	unknown	01:10–03:45 (good, 2.58 h)	89.7° 07:15	4.6	13%	46.5°
2032-07-04 Sun	71	—	unknown	01:05–03:45 (good, 2.67 h)	89.7° 07:10	4.63	7%	55.7°
2032-07-05 Mon	74	—	unknown	01:05–03:50 (good, 2.75 h)	89.6° 07:05	4.65	3%	65.6°
2032-07-06 Tue	77	—	unknown	01:00–03:50 (good, 2.83 h)	89.5° 07:05	4.68	1%	75.8°
2032-07-07 Wed	79	—	unknown	00:55–03:50 (good, 2.92 h)	89.7° 07:00	4.72	0%	86.1°
2032-07-08 Thu	80	—	unknown	00:50–03:50 (good, 3.0 h)	89.8° 06:55	4.75	2%	96.3°
2032-07-09 Fri	85	—	unknown	00:45–03:55 (good, 3.17 h)	89.7° 06:50	4.78	5%	106.3°
2032-07-10 Sat	87	—	unknown	00:45–03:55 (good, 3.17 h)	89.5° 06:45	4.82	10%	116.0°
2032-07-11 Sun	89	—	unknown	00:40–03:55 (good, 3.25 h)	89.6° 06:45	4.86	16%	125.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-06-12&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.