nadir concept from the Astronomy knowledge base

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abstraction > mathematical concept > geometrical object > point > coordinate > local coordinate > nadir

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nadir
(downward)

subject fact

nadir has antonym zenith 2001-09-27 09:32:41.0
has synonym downward
has elevation -90
has azimuth 0
is opposite of zenith
has definition The point on the celestial sphere diametrically opposite to the zenith in the direction of gravity. has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:32:41.0
is an instance of local coordinate

local coordinate has component local coordinate component 2001-09-27 09:32:40.0
has coordinate origin observer location on the surface of the Earth

point has dimensions 0 2001-09-27 09:32:38.0

nadir	has antonym zenith
	has synonym downward
	has elevation -90
	has azimuth 0
	is opposite of zenith
	has definition The point on the celestial sphere diametrically opposite to the zenith in the direction of gravity.
	is an instance of local coordinate
local coordinate	has component local coordinate component
local coordinate	has coordinate origin observer location on the surface of the Earth
point	has dimensions 0