Meaning of VERTICAL CIRCLE

Pronunciation:			'vurtikul 'surkul
WordNet Dictionary
	Definition:		[n]  a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
	Websites:
	See Also:		great circle
Glossary
	Definition:		with major surveying instruments, the graduated vertical table around which the sighting telescope rotates; used to measure the vertical angle.