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: 07-22 (100), 07-23 (100), 07-21 (96), 07-20 (91), 07-19 (80) — by astronomy; check the weather when the night is within four days.

2044-06-24astronomy score per night — click a bar for that night2044-07-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2044-07-15 Fri	35	—	unknown	23:50–04:00 (marginal, 4.17 h)	89.5° 06:30	5.03	72%	42.7°
2044-07-16 Sat	40	—	unknown	03:20–03:55 (good, 0.58 h)	89.7° 06:25	5.07	62%	34.9°
2044-07-17 Sun	50	—	unknown	00:45–04:05 (good, 3.33 h)	89.8° 06:20	5.11	52%	30.2°
2044-07-18 Mon	67	—	unknown	00:10–04:05 (good, 3.92 h)	89.7° 06:15	5.16	41%	30.4°
2044-07-19 Tue	80	—	unknown	00:10–04:05 (good, 3.92 h)	89.6° 06:10	5.21	30%	35.9°
2044-07-20 Wed	91	—	unknown	00:05–04:10 (good, 4.08 h)	89.6° 06:10	5.26	20%	45.1°
2044-07-21 Thu	96	—	unknown	00:00–04:10 (good, 4.17 h)	89.8° 06:05	5.3	12%	56.4°
2044-07-22 Fri	100	—	unknown	23:55–04:10 (good, 4.25 h)	89.8° 06:00	5.35	5%	68.8°
2044-07-23 Sat	100	—	unknown	23:50–04:10 (good, 4.33 h)	89.7° 05:55	5.4	1%	81.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-06-24&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.