than as a sphere.

Distance to the horizon

Formula

The distance to the true (geometric) horizon (not accounting for atmospheric refraction) from an observer at height above the surface of a celestial body assumed to be perfectly spherical can be calculated using the formula:

Where:
* is the distance to the true (geometric) horizon;
* is the radius of the assumed body, e.g., the Earth's arithmetic mean radius of 6,371,008.77138 meters (?);
* is the height of the observer above the surface,

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