Orthodox Easter calculator
Completely untested psuedo-code, but the key is to realize f = number of days from March 22 to Orthodox Easter.

(* f gives Easter as the number of days since March 22 *) 

easter = f+22+(year&lt;1918)*13 

month = "March"; # default 
if f &gt; 31 {month="April"; day=f-31} 
if f &gt; 61 {month="May"; day=f-61} 


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