JD2Day:
-------------------------------------------------------------------------------
Computes the day of the week from Julian day number.
-------------------------------------------------------------------------------
Form:
day = JD2Day( jD )
-------------------------------------------------------------------------------
------
Inputs
------
jD (1,1) Julian date
-------
Outputs
-------
day (1,3) 'Sun' 'Mon' 'Tue' 'Wed' 'Thu' 'Fri' 'Sat'
-------------------------------------------------------------------------------
Children:
Common: Math/R2P5
Common: Time/Date2JD