SIXTY()

       Converts a decimal number to sexigesimal.

       Reverse of the TEN() function.

       X = SIXTY( SCALAR )

       SCALAR -- Decimal quantity.

       Function value returned = floating real vector of three elements,
       sexigesimal equivalent of input decimal quantity.
       A negative number is signified by making the first non-zero
       element of the output vection negative.

       Mostly involves checking arguments and setting the sign.

       If x = -0.345d then sixty(x) = [0.0, -20.0, 42.0]

       Written by R. S. Hill, STX, 19-OCT-87
       Output changed to single precision.  RSH, STX, 1/26/88
       Accept single element vector   W. Landsman   Sep. 1996
       Converted to IDL V5.0   W. Landsman   September 1997

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