transit instrument

transit instrument

noun
1.
Astronomy. meridian circle.
2.
Surveying. transit (def. 6a).

Origin:
1805–15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Transit instrument is always a great word to know.
So is Sirius. Does it mean:
the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major
the fainter of the two stars that constitute a double or binary star
Collins
World English Dictionary
transit instrument
 
n
an astronomical instrument, mounted on an E-W axis, in which the reticle of a telescope is always in the plane of the meridian. It is used to time the transit of a star, etc, across the meridian

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