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: 12-07 (100), 12-08 (100), 12-09 (100), 12-10 (100), 12-11 (100) — by astronomy; check the weather when the night is within four days.

2044-12-02astronomy score per night — click a bar for that night2044-12-31

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2044-12-16 Fri	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.5° 19:20	11.5	6%	139.9°
2044-12-17 Sat	100	—	unknown	18:35–01:25 (good, 6.83 h)	89.6° 19:20	11.5	2%	131.2°
2044-12-18 Sun	100	—	unknown	18:35–01:25 (good, 6.83 h)	89.8° 19:15	11.51	0%	121.6°
2044-12-19 Mon	100	—	unknown	18:35–01:20 (good, 6.75 h)	89.8° 19:10	11.51	0%	111.6°
2044-12-20 Tue	100	—	unknown	18:35–01:15 (good, 6.67 h)	89.7° 19:05	11.51	2%	101.4°
2044-12-21 Wed	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.5° 19:05	11.51	6%	91.1°
2044-12-22 Thu	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.7° 19:00	11.51	11%	80.8°
2044-12-23 Fri	100	—	unknown	18:40–01:05 (good, 6.42 h)	89.8° 18:55	11.5	17%	70.5°
2044-12-24 Sat	98	—	unknown	18:40–01:00 (good, 6.33 h)	89.8° 18:50	11.5	25%	60.5°
2044-12-25 Sun	91	—	unknown	18:40–00:55 (good, 6.25 h)	89.6° 18:45	11.5	34%	50.7°
2044-12-26 Mon	83	—	unknown	18:40–00:50 (good, 6.17 h)	89.6° 18:45	11.49	44%	41.7°
2044-12-27 Tue	67	—	unknown	18:40–00:20 (good, 5.67 h)	89.7° 18:40	11.49	54%	34.1°
2044-12-28 Wed	50	—	unknown	18:40–01:15 (marginal, 6.58 h)	89.8° 18:35	11.48	64%	29.6°
2044-12-29 Thu	33	—	unknown	18:40–00:55 (marginal, 6.25 h)	89.7° 18:30	11.47	74%	30.1°
2044-12-30 Fri	26	—	unknown	18:45–00:30 (marginal, 5.75 h)	89.5° 18:25	11.47	83%	35.8°
2044-12-31 Sat	27	—	unknown	18:45–00:15 (marginal, 5.5 h)	89.6° 18:25	11.46	91%	45.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-12-02&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.