So that one doesn't move, despite the ecclesiatical rules for determining the date?

• Easter falls on the first Sunday following the first ecclesiastical full moon that occurs on or after the day of the vernal equinox
• 
  
• this particular ecclesiastical full moon is the 14th day of a tabular lunation (new moon)


• the vernal equinox is fixed as March 21.

Of course, the third point dictates a pretty stringent date, but still. It's not the vernal equinox down yonder.

Have the best

-=TK