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- astronomical refraction,
- astronomical telescope,
- astronomical triangle,
- astronomical twilight,
- astronomical unit,
Origin of astronomical year
First recorded in 1855–60
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
A solar year. See under solar time.
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