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sidereal month
si·de·re·al month (plural si·de·re·al months)


noun 
Definition:
 
single revolution of Moon: the time it takes for the Moon to make one revolution around the Earth in relation to a given star, equal to 27 days, 7 hours, 43 minutes, 4.5 seconds
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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