Function julianToMjd( julianEpoch )

Description:
Converts a Julian Epoch to Modified Julian Date. For approximate purposes, the argument of this routine consists of an integral part which gives the year AD and a fractional part which represents the distance through that year, so that for instance 2000.5 is approximately 1 July 2000.
Parameters:
julianEpoch (floating point)
Julian epoch
Return Value (floating point):
modified Julian date
Example:
julianToMjd(2000.0) = 51544.5
Signature:
double julianToMjd(double)