The Earliest and Latest Dates for Pascha
The earliest day on which Pascha can fall is March 22.
The latest is April 25.
If we connect the two days, the line will intersect all the other days in between. The difference is 34 days.
The importance of the date of Pascha cannot be overemphasized, because the whole Paschalion is reckoned from it, governing when all the feasts of the Triodion, the Pentecostarion, and the Octoëchos fall in any given year.
In this diagram we show the earliest and latest possible dates for Pascha; in the following diagrams, the earliest and latest possible dates for each feast of the Triodion, Pentecostarion, and Octoëchos will be shown in the same way, with a line connecting them, which will account for all the possible dates on which each of the feasts can fall.