Glossary of Radio Astronomy Terms

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Glossary of Radio Astronomy Terms

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List of Terms

Zenith:

The point on a celestial object that is vertically above the observer. (90 degrees above the observer)

Zenith distance:

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)

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The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
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