(en) N. Capitaine, P. T. Wallace et J. Chapron, « Expressions for IAU 2000 precession quantities », Astronomy & Astrophysics, no 412, , p. 567-586 (lire en ligne)[PDF].
archaeoastronomy.it
(en) « We have found in Corsica examples of equinoctial alignments and we can demonstrate that it is possible at 45° of Latitude to obtain it by the perfect linear shadow of the stick, as in the Lascaux’s Grotto, Chantal Jègues has discovered the Vernal Point in the Scorpio and the Autumn One in the Taurus. », (it) 9° Seminario di Archeoastronomia[PDF], p. 36.