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sidereal hour

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sidereal hour  
n.  A 24th part of a sidereal day.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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sidereal hour

noun
1/24 of a sidereal day 
WordNet® 3.0, © 2006 by Princeton University.
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