File: c1.pyx

package info (click to toggle)
cython 0.21.1-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 23,804 kB
  • ctags: 31,405
  • sloc: python: 55,862; ansic: 8,318; xml: 1,031; cpp: 777; makefile: 383; lisp: 206; sh: 7
file content (12 lines) | stat: -rw-r--r-- 286 bytes parent folder | download | duplicates (21) 
1
2
3
4
5
6
7
8
9
10
11
12
 
import math

def great_circle(lon1, lat1, lon2, lat2):
    radius = 3956 # miles
    x = math.pi/180.0

    a = (90.0 - lat1)*x
    b = (90.0 - lat2)*x
    theta = (lon2 - lon1)*x
    c = math.acos(math.cos(a)*math.cos(b) + math.sin(a)*math.sin(b)*math.cos(theta))

    return radius*c