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sideroad
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siderostat
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sidereal day
si·de·re·al day (plural si·de·re·al days)


noun 
Definition:
 
day calculated by using star's position: the time it takes for Earth to make one complete revolution in relation to a specific star, equal to 23 hours, 56 minutes, 4.1 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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