Glossary of Radio Astronomy Terms
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The point on a celestial object that is vertically above the observer. (90 degrees above the observer)
the angular distance of a celestial body from a zenith
Zero-age main sequence (ZAMS):
The main sequence on the Hertzsprung-Russell diagram as defined by the stars that have yet to go through substantial evolution. (See Hertzsprung-Russell Diagram for more)