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: 11-08 (100), 11-09 (100), 11-10 (100), 11-11 (100), 11-12 (100) — by astronomy; check the weather when the night is within four days.

2044-11-01astronomy score per night — click a bar for that night2044-11-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-11-01 Tue	84	—	unknown	03:15–04:30 (good, 1.25 h)	89.8° 22:20	10.52	85%	44.6°
2044-11-02 Wed	61	—	unknown	04:20–04:25 (good, 0.08 h)	89.8° 22:15	10.56	92%	36.2°
2044-11-03 Thu	34	—	unknown	23:55–04:25 (marginal, 4.5 h)	89.7° 22:10	10.6	97%	30.6°
2044-11-04 Fri	30	—	unknown	18:50–21:00 (marginal, 2.17 h)	89.5° 22:05	10.63	99%	30.0°
2044-11-05 Sat	38	—	unknown	18:45–22:15 (marginal, 3.5 h)	89.7° 22:05	10.66	100%	35.0°
2044-11-06 Sun	56	—	unknown	18:45–02:20 (marginal, 7.58 h)	89.8° 22:00	10.7	97%	43.9°
2044-11-07 Mon	67	—	unknown	18:45–20:50 (good, 2.08 h)	89.8° 21:55	10.73	92%	55.0°
2044-11-08 Tue	100	—	unknown	18:45–00:20 (good, 5.58 h)	89.6° 21:50	10.76	84%	67.1°
2044-11-09 Wed	100	—	unknown	18:45–02:20 (good, 7.58 h)	89.5° 21:50	10.8	75%	79.5°
2044-11-10 Thu	100	—	unknown	18:45–03:25 (good, 8.67 h)	89.7° 21:45	10.83	65%	92.0°
2044-11-11 Fri	100	—	unknown	18:40–03:35 (good, 8.92 h)	89.8° 21:40	10.86	53%	104.3°
2044-11-12 Sat	100	—	unknown	18:40–03:40 (good, 9.0 h)	89.7° 21:35	10.89	42%	116.1°
2044-11-13 Sun	100	—	unknown	18:40–03:40 (good, 9.0 h)	89.6° 21:30	10.92	32%	127.3°
2044-11-14 Mon	100	—	unknown	18:40–03:35 (good, 8.92 h)	89.6° 21:30	10.95	22%	137.3°
2044-11-15 Tue	100	—	unknown	18:40–03:35 (good, 8.92 h)	89.8° 21:25	10.98	14%	145.3°
2044-11-16 Wed	100	—	unknown	18:40–03:30 (good, 8.83 h)	89.8° 21:20	11.01	8%	150.0°
2044-11-17 Thu	100	—	unknown	18:40–03:25 (good, 8.75 h)	89.7° 21:15	11.03	3%	149.8°
2044-11-18 Fri	100	—	unknown	18:35–03:20 (good, 8.75 h)	89.5° 21:10	11.06	1%	145.2°
2044-11-19 Sat	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.7° 21:10	11.09	0%	137.7°
2044-11-20 Sun	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.8° 21:05	11.11	2%	128.7°
2044-11-21 Mon	100	—	unknown	18:35–03:10 (good, 8.58 h)	89.8° 21:00	11.14	5%	118.9°
2044-11-22 Tue	100	—	unknown	18:35–03:05 (good, 8.5 h)	89.6° 20:55	11.16	10%	108.8°
2044-11-23 Wed	100	—	unknown	18:35–03:00 (good, 8.42 h)	89.5° 20:55	11.18	16%	98.6°
2044-11-24 Thu	100	—	unknown	18:35–03:00 (good, 8.42 h)	89.7° 20:50	11.2	24%	88.3°
2044-11-25 Fri	100	—	unknown	18:35–02:55 (good, 8.33 h)	89.8° 20:45	11.23	32%	78.1°
2044-11-26 Sat	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.8° 20:40	11.25	41%	67.8°
2044-11-27 Sun	96	—	unknown	18:35–02:45 (good, 8.17 h)	89.6° 20:35	11.27	51%	57.7°
2044-11-28 Mon	88	—	unknown	18:35–02:40 (good, 8.08 h)	89.6° 20:35	11.29	61%	48.0°
2044-11-29 Tue	80	—	unknown	22:50–01:40 (good, 2.83 h)	89.8° 20:30	11.31	70%	39.2°
2044-11-30 Wed	50	—	unknown	18:35–03:00 (marginal, 8.42 h)	89.8° 20:25	11.32	80%	32.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-11-01&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.