Home > Terms > English, UK (UE) > Transit instrument
Transit instrument
A telescope mounted in horizontal bearings lying in an east-west direction, so that if the telescope is at right angles to its axle or arbour it will always lie in the meridian plane. A vertical crosswire in the centre of its eyepiece provides that when the image of a star lies exactly on this wire the star must lie exactly on the meridian, and is making its transit, the time of which can be recorded on a chronograph.
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- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Chronometry
- Category: Clock
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