WSJT-X/lib/toxyz.f90
Joe Taylor f283ca5c62 Another bunch needesd for astro display.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3839 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2014-03-05 20:14:36 +00:00

26 lines
506 B
Fortran

subroutine toxyz(alpha,delta,r,vec)
implicit real*8 (a-h,o-z)
real*8 vec(3)
vec(1)=r*cos(delta)*cos(alpha)
vec(2)=r*cos(delta)*sin(alpha)
vec(3)=r*sin(delta)
return
end subroutine toxyz
subroutine fromxyz(vec,alpha,delta,r)
implicit real*8 (a-h,o-z)
real*8 vec(3)
data twopi/6.283185307d0/
r=sqrt(vec(1)**2 + vec(2)**2 + vec(3)**2)
alpha=atan2(vec(2),vec(1))
if(alpha.lt.0.d0) alpha=alpha+twopi
delta=asin(vec(3)/r)
return
end subroutine fromxyz