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