Abstract

   CSPICE_B1900 returns the double precision value of the Julian Date
   corresponding to Besselian Date 1900.0: 2415020.31352.

I/O

   Given:

      None.

   the call:

      b1900 = cspice_b1900(  )

   returns:

      b1900    2415020.31352, the Julian Date corresponding to Besselian Date
               1900.0.

               help, b1900
                  DOUBLE = Scalar

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) Display the double precision value for the Julian Date
      corresponding to the Besselian date 1900.0.

      Example code begins here.


      PRO b1900_ex1
         ;;
         ;; Display the B1900 date in 16.8 floating point format
         ;;
         print, format='("B1900 date: ",F16.8)', cspice_b1900()

      END


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


      B1900 date: 2415020.31352000

Particulars

   The function always returns the constant value shown above.

Exceptions

   Error free.

Files

   None.

Restrictions

   None.

Required_Reading

   ICY.REQ
   TIME.REQ

Literature_References

   [1]  J. Lieske, "Precession Matrix Based on IAU (1976) System of
        Astronomical Constants," Astron. Astrophys. 73, 282-284,
        1979.

Author_and_Institution

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

Version

   -Icy Version 1.1.1, 31-MAY-2021 (JDR)

       Edited the header to comply with NAIF standard.

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

       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 1.1.0, 06-SEP-2005 (EDW)

       Update to header example.

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

Index_Entries

   besselian date 1900.0