transit instrument


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transit instrument

n
(Astronomy) 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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Noun1.transit instrument - a telescope mounted on an axis running east and west and used to time the transit of a celestial body across the meridiantransit instrument - a telescope mounted on an axis running east and west and used to time the transit of a celestial body across the meridian
telescope, scope - a magnifier of images of distant objects
References in periodicals archive ?
Maclear's southern terminal for the repeat of La Caille's work was the centre of the Transit instrument at the Royal Observatory and his northern terminal was a threshing floor that still exists and is marked by a plaque on a farm in the Piketberg.
A transit instrument is used in which scientific discipline?
The Prime Meridian of the World was defined by "The Centre of the Transit Instrument at the Observatory, Greenwich".