Abstract

   CSPICE_RPD returns the double precision value of the constant PI/180
   which represents the number of radians per degree of arc.

I/O

   Given:

      None.

   the call:

      rpd = cspice_rpd(  )

   returns:

      rpd      the number of radians per degree: pi/180.

               help, rpd
                  DOUBLE = Scalar

               The value of pi is determined by the acos function. That is,

                     cspice_rpd = acos ( -1.0 ) / 180.0

Parameters

   None.

Examples

   Any numerical results shown for this example may differ between
   platforms as the results depend on the SPICE kernels used as input
   and the machine specific arithmetic implementation.

   1) Print the number of radians per degree of arc.

      Example code begins here.


      PRO rpd_ex1

         ;;
         ;; Output the number of radians per degree, with 21.18 precision
         ;;
         print, FORMAT='("Radians per degree: ",F21.18)', cspice_rpd()

      END


      When this program was executed on a Mac/Intel/IDL8.x/64-bit
      platform, the output was:


      Radians per degree:  0.017453292519943295

Particulars

   The first time the function is referenced, the value is computed
   as shown above. The value is saved, and returned directly upon
   subsequent reference.

Exceptions

   Error free.

Files

   None.

Restrictions

   None.

Required_Reading

   ICY.REQ

Literature_References

   None.

Author_and_Institution

   J. Diaz del Rio     (ODC Space)
   E.D. Wright         (JPL)

Version

   -Icy Version 1.0.1, 25-AUG-2021 (JDR)

       Edited the header to comply with NAIF standard. Added example's
       problem statement and reformatted example's output.

       Added -Parameters, -Particulars, -Exceptions, -Files, -Restrictions,
       -Literature_References and -Author_and_Institution sections.

       Removed reference to the routine's corresponding CSPICE header from
       -Abstract section.

       Added argument's type and size information in the -I/O section.

   -Icy Version 1.0.0, 16-JUN-2003 (EDW)

Index_Entries

   radians per degree