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.

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.
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said, "We are very excited about the ability that Horizon Distance Learning will give us to reach out to our Sales force around the world on a more frequent basis.