horizon distance

horizon distance

(particle horizon) The total distance that a light signal could have traveled since the beginning of the Universe, and hence the maximum distance that can be seen in a cosmological model.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

horizon distance

[hə′rīz·ən ¦dis·təns]
(geodesy)
The distance, at any given azimuth, to the point on the earth's surface constituting the horizon for some specified observer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Knowing this, you can find the horizon distance on any large world if you know its diameter compared with Earth's.

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