A non-judgemental calendar question

[Eugenio]

Not sure where I ought to put this, but here goes:

Right now, the "Old Calendar" and "New Calendar" churches are on a different timeframe. Christmas & Theophany are celebrated on different days of the year.

But at some point, we go into Great Lent and then celebrate Pascha on the same day. So without knowing more, am I assuming right that there are dates upon which the Old & New calendar churches "divide" & "reunite"?

On what dates of the calendar do the "Old" & "New" calendars "converge" and "separate"? How does this work?

[Fr. George]

^ The "Old" and "New" Calendars are always different; but the Paschalion (the calculation of Pascha, and the related days) is always the same.  So there is no magic date when the align and then another when they go out of synch. 

[Alveus Lacuna]

Just on Pascha and all dates related to Pascha. Even when those days are the same, most of the saints commemorated are on different days. However, since the readings for the year are based on Pascha, usually the readings are the same for Old and New Calendar.

[deusveritasest]

It's fairly simple. The Paschalion has remained the same in the churches using the Revised Julian calendar. All commemorations dependent on Pascha for the determination of their date have remained the same. All other commemorations have shifted the 13 days.

Some churches, however, have adopted the new Paschalion, including the Finnish church, the East Syrian church, most Armenian churches, and most Malankarese churches.

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