true horizon

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Related to true horizon: horizon line

true horizon

1. The boundary of a horizontal plane passing through a point of vision.
2. In photogrammetry, the boundary of a horizontal plane passing through the perspective center of a lens system.

Dictionary of Military and Associated Terms. US Department of Defense 2005.

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References in periodicals archive ?

That's the distance to the true horizon on Earth in miles--to a remarkable accuracy of nearly 1 part in 1,000.

Distance to your horizon

This is especially critical at night with a low cloud layer and an absence of a true horizon. Taking off on runway 21 at Point Mugu has you heading right into the land-sea interface, where you go from a multitude of lights on shore to pitch black out to sea.

Talk about it later

At Sun angle -13[degrees] below true horizon, dawn flats can be taken prior to parking the 'scope and closing the roof.