visual horizon

natural horizon

The circle around the observer where the earth and the sky appear to meet. Also called a visual horizon or an apparent horizon.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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"We'll have a visual horizon of 20 miles when the weather is good, as well as binoculars and a telescope."
Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere long waves can diffract around obstacles like mountains and follow the contour of the earth (ground waves), shorter waves can reflect off the ionosphere and return to earth beyond the horizon (skywaves), while much shorter wavelengths bend or diffract very little and travel on a line of sight, so their propagation distances are limited to the visual horizon.
It was a horizon no one could see beyond, not completely dissimilar to our visual horizon into the universe's past, making its study all the more intriguing.
Nine large black-and-gold abstract paintings from 2015, each featuring a variation of the same geometric shape, hung on the walls in such a way that they constructed a visual horizon that might have reminded viewers that they had wandered into a gallery, not onto a film set.
In chapter 5, "Kingship and Visual Communication in the Early Dynastic Period," Marchetti sets the royal statues within a broad visual horizon consisting of steles, seals, plaques, and inlays.
"In addition, the articulating design enables me to obtain the critical view of anatomical structures in HD 3-D without losing the important visual horizon. This is not possible with traditional fixed angle laparoscopes."
It's the row of white lights 1,000 feet from the runway that serves as a visual horizon line reference.
Birds could turn upwind toward a food source several miles away--well over the visual horizon. Hunting by scent allows the albatross to cover a strip of ocean several miles wide as it flies crosswind, Nevitt explains.
A somewhat paradoxical fact about the visual horizon, revealed by phenomenological analysis, is that the horizon itself is both seen and is not seen.
The horizon becomes something of a leitmotif for the book, and is apparently attractive to Klitgard because it allows her to draw a second analogy, this time between "figurative language and the visual horizon," both of which, she argues, "designate a fusion of two dissimilars which form a fictional reality" (1).

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