Why don't Orthodox celebrate Pascha with Western Christians?

from:
http://webcache.googleusercontent.com/search?q=cache:Df1ZrnXUIKcJ:www.roacusa.org/htdocs/Orthodox%2520School/Canon%2520Law/canons_apostles_grabbe.doc

 http://www.roacusa.org/htdocs/Orthodox%20School/Canon%20Law/canons_apostles_grabbe.doc

"If any bishop, presbyter, or deacon shall celebrate the holy day of Easter before the vernal equinox with the Jews, let him be deposed."

(Canon 70 of the Holy Apostles; Canon 11 of the 6th Council; Canon 1 of the Council of Antioch; Canon 37 of the Council of Laodicea).  The time for celebrating Pascha was set by the 1st Ecumenical Council.  This Canon identifies the astronomical point (the vernal equinox) for determining the celebration of Pascha (after the vernal equinox).  Moreover, the Canon forbids the celebration of Pascha coincident with the celebration of Passover by the Jews, for the celebration by Christians must be separated and in no way joined with those who are alien to Christ.  This Canon is not observed in the West where the celebration of Easter is based on the new (Gregorian) calendar and where Easter sometimes coincides with the Jewish celebration.

• full discourse on the Calendar Question:

http://www.hotca.org/orthodoxy/orthodox-awareness/203-the-calendar-question