The Letter Which Denotes Sunday Is Called The Dominical Letter, Or The Sunday Letter; And When The Dominical Letter Of The Year Is Known, The Letters Which Respectively Correspond To The Other Days Of The Week Become Known At The Same Time.
At The End Of The Cycle The Dominical Letters Return Again In The Same Order On The Same Days Of The Month; Hence A Table Of Dominical Letters, Constructed For Twenty Eight Years, Will Serve To Show The Dominical Letter Of Any Given Year From The Corn Mencement Of The Era To The Reformation.
In This Manner It Is Easy To Find The Dominical Letter Belonging To Each Of The Twenty Eight Years Of The Cycle.
This Long Period, However, May Be Reduced To Four Hundred Years; For Since The Dominical Letter Goes Back Five Places Every Four Years, Its Variation In Four Hundred Years, In The Julian Calendar, Was Five Hundred Places, Which Is Equivalent To Only Three Places (For Five Hundred Divided By Seven Leaves Three); But The Gregorian Calendar Suppresses Exactly Three Intercalations In Four Hundred Years, So That After Four Hundred Years The Dominical Letters Must Again Return In The Same Order.
Hence The Following Table Of Dominical Letters For Four Hundred Years Will Serve To Show The Dominical Letter Of Any Year In The Gregorian Calendar For Ever.
