Dear Ulrich Voigt and Remi Sussan, This is my favorite American philosophical scholar. The WHOLE of the first coming is accessible at this site –

http://www.stanford.edu/dept/relstud/faculty/sheehan/Sheehan.html

- as well as his (the best) translation of "What is Metaphysics?" by Heidegger and many, many other things. I do not know if he addresses the issue of the Easter date, but his footnotes are EXTENSIVE!!!!! The Karl Rahner: The Philosophical Foundations, Athens, Ohio: Ohio University Press, 1987. Continental Thought Series, Volume 9, is one of the very best books ever written about Heidegger and demonstrates Sheehan's mastery of Scholastic terminology and logic and philosophical history up through Karl Rahner. Karl Rahner himself is not an out-dated figure at all. Happy reading!!!!!!

'Sincerely'

Gary C. Moore.