on; up; on top; upon; first (of two parts); previous or last (week, etc.); upper; higher; above; previous; to climb; to go into; above; to go up
|to know; to be aware||astronomy||
under; second (of two parts); next (week, etc.); lower; below; underneath; down(wards); to decline; to go down; latter
|simp. and trad.
Literally: know the astronomy above, and know the geography below
- describes someone who is very learned; a polymath