horizon

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Related to true horizon: horizon line

horizon

noun border, boundary, field of view, field of vision, prospect, range, range of vision, realm, skyline, view, vista
References in periodicals archive ?
For instance, if you're standing on a beach with your eyes 6 feet above sea level, the distance to your true horizon is 3 miles.
When the true horizon is obscured by low clouds, or restricted visibility, the pilot may think that the natural horizon is lower on the windscreen than it actually is.
The distant runway lights, along with the sloping fog deck, combined to substitute for the true horizon.