Procedure

     J2000 ( Julian Date of 2000 JAN 1.5 )

     DOUBLE PRECISION FUNCTION J2000 ( )

Abstract

     Return the Julian Date of 2000 JAN 01 12:00:00 (2000 JAN 1.5).

Required_Reading

     None.

Keywords

     CONSTANTS

Declarations

    None.

Brief_I/O

     The function returns the Julian Date of 2000 JAN 01 12:00:00
     (2000 JAN 1.5).

Detailed_Input

     None.

Detailed_Output

     The function returns 2451545.0, the Julian Date corresponding
     to 2000 JAN 01 12:00:00 (2000 JAN 1.5).

Parameters

     None.

Exceptions

     Error free.

Files

     None.

Particulars

     The function always returns the constant value shown above.

Examples

     The following code fragment illustrates the use of J2000.

        C
        C     Convert Julian Date to UTC seconds past the reference
        C     epoch (J2000).
        C
              SPREF = ( JD - J2000() ) * SPD()

Restrictions

     None.

Literature_References

     None.

Author_and_Institution

     J. Diaz del Rio    (ODC Space)
     W.L. Taber         (JPL)
     I.M. Underwood     (JPL)

Version

    SPICELIB Version 1.0.2, 08-JUL-2020 (JDR)

        Edited the header to comply with NAIF standard.

    SPICELIB Version 1.0.1, 10-MAR-1992 (WLT)

        Comment section for permuted index source lines was added
        following the header.

    SPICELIB Version 1.0.0, 31-JAN-1990 (WLT) (IMU)