horizon | R Documentation |

Empirical function to compute the distance to the horizon from a given altitude. The earth is assumed to be smooth, i.e. mountains and other obstacles are ignored.

horizon(h, r=6378137)

`h` |
altitude, numeric >= 0. Should have the same unit as r |

`r` |
radius of the earth; default value is 6378137 m |

Distance in units of `h`

(default is meters)

Robert J. Hijmans

https://www.edwilliams.org/avform147.htm#Horizon

Bowditch, 1995. American Practical Navigator. Table 12.

horizon(1.80) # me horizon(324) # Eiffel tower

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