Alf is mistaken.  Easter is not determined astronomically either by East or West.  But if it had been, it would have agreed in 2009 with the western Easter, since the equinox was on March 20 and the full moon was on April 9.

The orthodox computations do not "take into account the Jewish Passover".  This "Zonaras proviso" is widely repeated and widely believed, but it is false.  Orthodox Easter always follows Hebrew Nisan 15 in modern times simply because the errors that have built up in the Julian solar and lunar calendars ensure that this is always the case.