CSPICE_CLIGHT returns the double precision value for the constant
speed of light in a vacuum (IAU official value, in km/sec).
For important details concerning this module's function, please refer to
the CSPICE routine clight_c.
No input required.
speed_of_light = cspice_clight()
A double precision scalar, the IAU official value for the
speed of light in vacuo: 299792.458 km/sec.
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: 299792.46
-Icy Version 1.0.0, 16-JUN-2003, EDW (JPL)
measured velocity of light in a vacuum