sidereal day

noun Astronomy.

the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.

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Origin:
1785–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sidereal day is always a great word to know.

So is alpha. Does it mean:

used to designate the brightest star in a constellation

a system of two stars that revolve about a common center of mass

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Collins

World English Dictionary

sidereal day

—n
	See day

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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