The New Student's Reference Work/Nadir

From Wikisource
Jump to navigation Jump to search

Nadir (nā′ dẽr), an Arabic word used by astronomers to denote the point just opposite the zenith.  The zenith being the point immediately over head, the nadir might be defined as the point immediately under foot.  A plumb-bob suspended by a string always points to the nadir and to the zenith, at the same time.