Here you will find definitions of some of the  more commonly used terms in astronomy.  I have included some obscure terms as well, just for fun.  Click the appropriate letter tab above to find your definition. The definitions are mine, based on my experience of more than a third of a century of teaching astronomy.  Of course, if you have an issue with one of my definitions or believe that it might need further clarification, get in touch with me to let me know. If there is a term that I have excluded and you believe deserves a place here, also let me know.
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Carpe Caelum