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siderosis
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sidereal period
si·de·re·al pe·ri·od (plural si·de·re·al pe·ri·ods)


noun 
Definition:
 
orbit time measured relative to stars: the time taken for one astronomical body to orbit another measured relative to the stars
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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