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: 11-16 (100), 11-17 (100), 11-18 (100), 11-19 (100), 11-20 (100) — by astronomy; check the weather when the night is within four days.

2044-11-16astronomy score per night — click a bar for that night2044-12-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2044-12-01 Thu	32	—	unknown	18:35–02:40 (marginal, 8.08 h)	89.7° 20:20	11.34	88%	29.4°
2044-12-02 Fri	26	—	unknown	18:35–21:05 (marginal, 2.5 h)	89.5° 20:15	11.36	94%	32.1°
2044-12-03 Sat	31	—	unknown	18:35–22:45 (marginal, 4.17 h)	89.6° 20:15	11.37	98%	39.7°
2044-12-04 Sun	44	—	unknown	18:35–01:45 (marginal, 7.17 h)	89.8° 20:10	11.39	100%	50.3°
2044-12-05 Mon	65	—	unknown	18:35–19:45 (good, 1.17 h)	89.8° 20:05	11.4	98%	62.4°
2044-12-06 Tue	76	—	unknown	18:35–22:55 (good, 4.33 h)	89.7° 20:00	11.42	94%	75.2°
2044-12-07 Wed	100	—	unknown	18:35–00:40 (good, 6.08 h)	89.5° 20:00	11.43	88%	88.1°
2044-12-08 Thu	100	—	unknown	18:35–01:40 (good, 7.08 h)	89.7° 19:55	11.44	79%	101.0°
2044-12-09 Fri	100	—	unknown	18:35–01:45 (good, 7.17 h)	89.8° 19:50	11.45	68%	113.4°
2044-12-10 Sat	100	—	unknown	18:35–01:50 (good, 7.25 h)	89.8° 19:45	11.46	58%	125.0°
2044-12-11 Sun	100	—	unknown	18:35–01:45 (good, 7.17 h)	89.6° 19:40	11.47	47%	135.4°
2044-12-12 Mon	100	—	unknown	18:35–01:45 (good, 7.17 h)	89.6° 19:40	11.48	36%	144.0°
2044-12-13 Tue	100	—	unknown	18:35–01:45 (good, 7.17 h)	89.7° 19:35	11.48	26%	149.5°
2044-12-14 Wed	100	—	unknown	18:35–01:40 (good, 7.08 h)	89.8° 19:30	11.49	18%	150.5°
2044-12-15 Thu	100	—	unknown	18:35–01:35 (good, 7.0 h)	89.7° 19:25	11.49	11%	146.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-11-16&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.