@S1-A.ARPA,@MIT-MC.ARPA:koolish@bbncd2 (08/21/85)
From: Dick Koolish <koolish@bbncd2.arpa> One finds out about obliquity of the ecliptic from the Explanatory Supplement to the American Ephemeris published by the Naval Observatory. Last time I called them, they were preparing a new edition of the book with all the latest numbers. I don't know if it has been published yet, although the previous editions are around.