# zenith distance

- the angular distance from the zenith of a point on the celestial sphere to the sphere, measured along a great circle that is perpendicular to the horizon; the complement of the altitude.

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## Origin of zenith distance

First recorded in 1695–1705

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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for zenith distance

### Historical Examples of zenith distance

The zenith-distance of an object is the angle which the ray of light from it makes with the vertical direction thus defined.