Sky Publishing Corporation (S&T) has it in volume 1 of their publication "Sky Catalogue 2000.0 Volume1 Stars to Magnitude 8.0". In the Introduction page vii has the simple formulas. Page xiii has the rigorous precession formulas. Stan On 4/28/2012 7:39 AM, Richard Harshaw wrote: > Does anyone in this august group know the formula, transformation or > algorithm to determine the vectors for precession for any point on the sky > using equatorial coordinates and a given date? > > > Richard Harshaw > > > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.