celestial sphere Comparison Table

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celestial sphere comparison table

Subject is an instance of is a kind of has dimension is defined us has definition

equatorial sky area quantity equatorial coordinates A fixed region on the sky defined using equatorial coordinates

sphere geometrical object 3 The outer surface of a ball. The surface of a familiar three-dimensional ball has two dimensions (which can be labeled by two numbers such as "latitude" and "longitude," as on the surface of the earth). The concept of a sphere, though, applies more generally to balls and hence their surfaces, in any number of dimensions. A one-dimensional sphere is a fancy name for a circle; a zero-dimensional sphere is two points (as explained in the text). A three-dimensional sphere is harder to picture; it is the surface of a four-dimensional ball.

celestial sphere sphere 3 equatorial coordinates An imaginary sphere of arbitrary radius upon which celestial bodies may be considered to be located. As circumstances require, the celestial sphere may be centered at the observer, at the Earth's center or at any other location.

Subject	is an instance of	is a kind of	has dimension	is defined us	has definition
equatorial sky area		quantity		equatorial coordinates	A fixed region on the sky defined using equatorial coordinates
sphere		geometrical object	3		The outer surface of a ball. The surface of a familiar three-dimensional ball has two dimensions (which can be labeled by two numbers such as "latitude" and "longitude," as on the surface of the earth). The concept of a sphere, though, applies more generally to balls and hence their surfaces, in any number of dimensions. A one-dimensional sphere is a fancy name for a circle; a zero-dimensional sphere is two points (as explained in the text). A three-dimensional sphere is harder to picture; it is the surface of a four-dimensional ball.
celestial sphere	sphere		3	equatorial coordinates	An imaginary sphere of arbitrary radius upon which celestial bodies may be considered to be located. As circumstances require, the celestial sphere may be centered at the observer, at the Earth's center or at any other location.

Next equatorial sky area: circumpolar region Up: equatorial sky area, sphere Previous equatorial sky area: Baade's Window