central.angle: Central angle between two points on a sphere

In retistruct: Retinal Reconstruction Program

Description

On a sphere the central angle between two points is defined as the angle whose vertex is the centre of the sphere and that subtends the arc formed by the great circle between the points. This function computes the central angle for two points (phi1, lambda1) and (phi2, lambda2).

Usage

central.angle(phi1, lambda1, phi2, lambda2)

Arguments

phi1	Latitude of first point
lambda1	Longitude of first point
phi2	Latitude of second point
lambda2	Longitude of second point

Value

Central angle

Author(s)

David Sterratt

Source

Wikipedia http://en.wikipedia.org/wiki/Central_angle

retistruct documentation built on April 4, 2020, 5:08 p.m.