great-circle-bearing v1.0.0

great-circle-bearing

bearing in degrees for the initial course along a great circle for two lon,lat points

Note that the bearing will change along the route over a great circle. If you want a constant course (and are ok to spiral around the poles), use rhumb line navigation.

example

var gcb = require('great-circle-bearing')
var a = [-147.7,64.8] // fairbanks
var b = [139.7,35.7] // tokyo
console.log(gcb(a,b)) // -87.87704328893989
console.log(gcb(b,a)) // 31.5972438661438

api

var gcb = require('great-circle-bearing')

var course = gcb(a,b)

Return the course in degrees for the route from a to b where each coordinate pair is a [lon,lat] for longitude and latitude in degrees.

install

npm install great-circle-bearing

license

bsd