late 14c., from astronomy (q.v.), replacing French import astronomyen (c. 1300), which, had it survived, probably would have yielded *astronomian. Still in Shakespeare used in places where we would write astrologer.
权威例句
1. An astronomer can determine the brightness of each star.
天文学家能够测定每颗恒星的亮度。
2. A new star attracted the notice of the astronomer.
新发现的一颗星引起了那位天文学家的注意.
3. Finally one day, an astronomer came to our village.
终有一日, 村子里来了一个天文学家.
4. He is reputed to have been a good astronomer.
他以一个优秀的天文学者闻名于世.
5. It is the only tangible object the astronomer can handle.