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: 07-06 (73), 07-07 (73), 07-05 (72), 07-04 (70), 07-03 (68) — by astronomy; check the weather when the night is within four days.

2044-06-15astronomy score per night — click a bar for that night2044-07-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-06-15 Wed	19	—	unknown	03:25–03:40 (good, 0.25 h)	89.8° 08:25	4.45	76%	69.9°
2044-06-16 Thu	20	—	unknown	03:20–03:40 (good, 0.33 h)	89.6° 08:20	4.44	68%	59.6°
2044-06-17 Fri	22	—	unknown	02:45–03:40 (good, 0.92 h)	89.6° 08:20	4.43	58%	49.7°
2044-06-18 Sat	25	—	unknown	02:35–03:40 (good, 1.08 h)	89.7° 08:15	4.42	48%	40.6°
2044-06-19 Sun	29	—	unknown	02:25–03:40 (good, 1.25 h)	89.8° 08:10	4.42	37%	33.4°
2044-06-20 Mon	35	—	unknown	02:00–03:40 (good, 1.67 h)	89.7° 08:05	4.42	27%	29.9°
2044-06-21 Tue	41	—	unknown	02:00–03:40 (good, 1.67 h)	89.6° 08:00	4.42	17%	31.9°
2044-06-22 Wed	46	—	unknown	01:55–03:40 (good, 1.75 h)	89.6° 08:00	4.43	9%	39.1°
2044-06-23 Thu	50	—	unknown	01:50–03:40 (good, 1.83 h)	89.8° 07:55	4.43	4%	49.5°
2044-06-24 Fri	51	—	unknown	01:45–03:40 (good, 1.92 h)	89.8° 07:50	4.44	1%	61.6°
2044-06-25 Sat	53	—	unknown	01:40–03:40 (good, 2.0 h)	89.7° 07:45	4.45	0%	74.5°
2044-06-26 Sun	55	—	unknown	01:40–03:40 (good, 2.0 h)	89.5° 07:40	4.46	4%	87.6°
2044-06-27 Mon	57	—	unknown	01:35–03:40 (good, 2.08 h)	89.7° 07:40	4.48	9%	100.5°
2044-06-28 Tue	59	—	unknown	01:30–03:40 (good, 2.17 h)	89.8° 07:35	4.49	17%	112.9°
2044-06-29 Wed	61	—	unknown	01:25–03:45 (good, 2.33 h)	89.8° 07:30	4.51	26%	124.6°
2044-06-30 Thu	63	—	unknown	01:25–03:45 (good, 2.33 h)	89.6° 07:25	4.53	37%	134.9°
2044-07-01 Fri	65	—	unknown	01:20–03:45 (good, 2.42 h)	89.5° 07:25	4.55	47%	143.4°
2044-07-02 Sat	67	—	unknown	01:15–03:45 (good, 2.5 h)	89.7° 07:20	4.58	57%	148.9°
2044-07-03 Sun	68	—	unknown	01:15–03:45 (good, 2.5 h)	89.8° 07:15	4.6	67%	150.2°
2044-07-04 Mon	70	—	unknown	01:15–03:45 (good, 2.5 h)	89.7° 07:10	4.63	76%	147.0°
2044-07-05 Tue	72	—	unknown	01:10–03:50 (good, 2.67 h)	89.6° 07:05	4.66	84%	140.6°
2044-07-06 Wed	73	—	unknown	01:10–03:50 (good, 2.67 h)	89.6° 07:05	4.69	90%	132.4°
2044-07-07 Thu	73	—	unknown	01:05–03:50 (good, 2.75 h)	89.8° 07:00	4.72	95%	123.2°
2044-07-08 Fri	63	—	unknown	01:05–03:50 (good, 2.75 h)	89.8° 06:55	4.75	98%	113.4°
2044-07-09 Sat	58	—	unknown	01:10–03:55 (good, 2.75 h)	89.7° 06:50	4.79	100%	103.3°
2044-07-10 Sun	51	—	unknown	01:15–03:55 (good, 2.67 h)	89.5° 06:45	4.82	100%	93.0°
2044-07-11 Mon	44	—	unknown	02:00–03:55 (good, 1.92 h)	89.7° 06:45	4.86	97%	82.6°
2044-07-12 Tue	39	—	unknown	03:00–03:55 (good, 0.92 h)	89.8° 06:40	4.9	94%	72.2°
2044-07-13 Wed	35	—	unknown	00:05–04:00 (marginal, 3.92 h)	89.8° 06:35	4.94	88%	61.9°
2044-07-14 Thu	34	—	unknown	00:00–04:00 (marginal, 4.0 h)	89.6° 06:30	4.98	81%	51.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-06-15&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.