Astronomy & telescopes glossary - W

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Astronomy & Telescopes Glossary - W

Waning moon - A waning moon is decreasing in size.

Waxing moon - A waxing moon is increasing in size.

Widefield eyepiece - An eyepiece with an apparent field of view (FOV) of more than about 50 degrees.
Guide to Amateur Astronomy, Planets and Constellations

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