WSJT-X/libm65/toxyz.f90

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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