meridian circle

meridian circle

noun Astronomy.
a transit instrument provided with a graduated vertical scale, used to measure the declinations of heavenly bodies and to determine the time of meridian transits.


Origin:
1540–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Meridian circle is always a great word to know.
So is horizon. Does it mean:
the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km)
the small circle of the celestial sphere whose plane is tangent to the earth at the position of the observer
Collins
World English Dictionary
meridian circle
 
n
an instrument used in astronomy for determining the declination and right ascension of stars. It consists of a telescope attached to a graduated circle

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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