look up any word, like fleek:
 
1.
Someone who does it all night.
Girl #1: I met this guy Friday night and we went at it until sunrise.

Girl #2: He must have been an astronomer.
by AbnormalBoy September 15, 2004
 
2.
A scientist who studies stars and other objects in the sky.
by App2011 October 28, 2011