XMM-Newton Science Analysis System


ssclib (ssclib-4.30) [xmmsas_20160201_1833-15.0.0]

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skyToCartesian

  interface skyToCartesian
    function skyToCartesianSingle(ra, dec) result(vector)
      real(single), intent(in) :: ra, dec 
      real(single)             :: vector(3)
    end function skyToCartesian

    function skyToCartesianDouble(ra, dec) result(vector)
      real(double), intent(in) :: ra, dec 
      real(double)             :: vector(3)
    end function skyToCartesian
  end interface

Returns a vector of direction cosines of the celestial coordinates $ra$ and $dec$. NOTE $ra$ and $dec$ must be in radians.