| 释义 |
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. |