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The
Zenith and Meridian:
Two
final references that are useful for working with the Celestial Sphere
are the
-
The
Zenith:
The location on the Celestial Sphere that is directly overhead.
Because you rotate under the Sphere the Zenith traces out a circle, much
like a latitude line on a globe. On the Celestial Sphere, this circle
is called a line of Declination.
-
The
Meridian: An
arc on the sky going from horizon to horizon and passing through both
the Celestial Pole
and the Zenith.
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