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: 07-19 (76), 07-06 (75), 07-07 (75), 07-08 (75), 07-05 (73) — by astronomy; check the weather when the night is within four days.

2033-06-20astronomy score per night — click a bar for that night2033-07-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2033-07-06 Wed	75	—	unknown	01:05–03:50 (good, 2.75 h)	89.7° 07:05	4.68	71%	143.1°
2033-07-07 Thu	75	—	unknown	01:05–03:50 (good, 2.75 h)	89.8° 07:00	4.71	79%	137.3°
2033-07-08 Fri	75	—	unknown	01:00–03:50 (good, 2.83 h)	89.7° 06:55	4.74	87%	129.4°
2033-07-09 Sat	69	—	unknown	01:00–03:50 (good, 2.83 h)	89.5° 06:50	4.78	93%	120.1°
2033-07-10 Sun	64	—	unknown	01:05–03:55 (good, 2.83 h)	89.6° 06:50	4.81	97%	109.7°
2033-07-11 Mon	55	—	unknown	01:10–03:55 (good, 2.75 h)	89.7° 06:45	4.85	100%	98.7°
2033-07-12 Tue	46	—	unknown	02:00–03:55 (good, 1.92 h)	89.8° 06:40	4.89	99%	87.3°
2033-07-13 Wed	39	—	unknown	03:05–03:55 (good, 0.83 h)	89.7° 06:35	4.93	97%	75.7°
2033-07-14 Thu	34	—	unknown	00:05–04:00 (marginal, 3.92 h)	89.5° 06:30	4.97	92%	64.3°
2033-07-15 Fri	32	—	unknown	00:00–04:00 (marginal, 4.0 h)	89.6° 06:30	5.01	84%	53.5°
2033-07-16 Sat	34	—	unknown	23:50–04:00 (marginal, 4.17 h)	89.7° 06:25	5.06	75%	44.0°
2033-07-17 Sun	42	—	unknown	02:55–04:05 (good, 1.17 h)	89.7° 06:20	5.1	64%	37.1°
2033-07-18 Mon	57	—	unknown	00:15–04:05 (good, 3.83 h)	89.6° 06:15	5.15	53%	34.3°
2033-07-19 Tue	76	—	unknown	00:10–04:05 (good, 3.92 h)	89.5° 06:15	5.19	41%	36.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-06-20&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.