Easter dates

Hello

I have been working on a spreadsheets of dates for Easter from 1593 to 2999
by date and have noticed something. Does anybody know why, on many
occasions the same easter date is often 11 years apart
for example easter day on march 30 occured in 1975 1986 and 1997 then a gap
of 62 years then 2059 2070 and 2081 and 2092
in fact there are 54 Easters in this period for march 30 and on 38 occasions
they are 11 years after a previous one, The next highest gap is 62 years
which has 7 occasions.
this is puzzling me
also taking 23rd March which is this years easter and only occurs these 13
times the number 152 years comes up 4 times 1636 1704 1788 1845 1856 1913
2008 2160 2228 2380 2532 2600 and 2752
the 152 year gaps are 2008-2160, 2228-2380 2380 -2532 and 2600-2752
if any body wants a copy of this sheet only complete to March 30 so far
please let me know


Pondpaul