b1900_c

Index Page b1900_c
A B C D E F G H I J K L M N O P Q R S T U V W X
Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input | Detailed_Output Parameters Exceptions Files Particulars Examples | Restrictions Literature_References Author_and_Institution Version Index_Entries
#### Procedure
       SpiceDouble b1900_c ( void )
#### Abstract
       Return the Julian Date corresponding to Besselian Date 1900.0.
#### Required_Reading
       None.
#### Keywords
       CONSTANTS
#### Brief_I/O
       The function returns the Julian Date corresponding to Besselian
       date 1900.0.
#### Detailed_Input
       None.
#### Detailed_Output
       The function returns 2415020.31352, the Julian Date corresponding
       to Besselian Date 1900.0 as reported by Lieske [1].
#### Parameters
       None.
#### Exceptions
       Error free.
#### Files
       None.
#### Particulars
       Lieske [1] defines a mapping from Julian Ephemeris Date
       to Besselian:

          BE = 1900. + (JED - 2415020.31352)/365.242198781

       The inverse mapping being:

          JED = (BE - 1900.)*365.242198781 + 2415020.31352
#### Examples
       The following code fragment illustrates the use of b1900_c.

          /.
          Convert Julian Date to UTC seconds past the reference
          epoch (B1900).
          ./

          spref = ( jd - b1900_c() ) * spd_c();
#### Restrictions
       None.
#### Literature_References
       [1] Jay Lieske, ``Precession Matrix Based on IAU (1976)
           System of Astronomical Constants,'' Astron. Astrophys.
           73, 282-284 (1979).
#### Author_and_Institution
       W.L. Taber      (JPL)
       I.M. Underwood  (JPL)
#### Version
       -CSPICE Version 1.1.0, 01-SEP-2005 (EDW)

           Added journal reference and associated citations.

       -CSPICE Version 1.0.1, 08-FEB-1998 (EDW)

           Corrected and clarified header entries.

       -CSPICE Version 1.0.0, 25-OCT-1997 (EDW)
#### Index_Entries
       besselian date 1900.0
#### Link to routine b1900_c source file b1900_c.c

    Thu Apr 16 08:57:21 2009