OBLIQUITY OF THE ECLIIPTIC FILE:  ecliptic.txt in the ephemeris directory

This file contains values of the obliquity of the ecliptic according to
various conventions.  Details are given in the file itself.  The file can
have comments starting with a pound sign.  Blank lines are ignored.
Lines should following the form of, e.g.,
IAU1976 84381.448
where the first word on the line is the name of the convention and 
the second is the value of the obliquity in milliarcseconds.
Whitespace may be used freely.

One entry should have the convention name DEFAULT.  This value will
be used if the user does not specify a convention.  The DEFAULT value
can be equal to the value of another entry, e.g.,
IAU1976 84381.448
DEFAULT 84381.448