CSPICE_HALFPI returns the double precision value of the constant PI/2.0.
For important details concerning this module's function, please refer to
the CSPICE routine halfpi_c.
No input required.
halfpi_double = cspice_halfpi()
A double precision scalar, the value of half the value of pi.
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.
IDL outputs: 1.5707963
-Icy Version 1.0.0, 16-JUN-2003, EDW (JPL)
half the value of pi