For a simple, accurate and reliable eternal determining Orthodox Easter dates and related carryover dates Orthodox holiday calendar device for determining Orthodox Easter dates contains two mounted on the axis of the disk with marks and a scale Orthodox Easter dates, while discs with labels are arranged to be rotation about an axis alignment marks on the disks and notes Align the mark Orthodox Easter date on the scale of the Orthodox Easter date. Thus on each of the discs of the calendar device applied to the same sequence of 35 concentric circles with centers coincident with the drive axis center, with one disk is divided into equal sectors 28th rays, and the other disk is divided into equal sectors 19 th rays, and labels on the disks are applied in certain points of the intersection of concentric circles and rays. In this calendar device is provided with a scale Orthodox Easter dates in the Julian calendar (old style and / or scale Orthodox Easter date of the Gregorian calendar (new style), and also scales the dates associated with the Orthodox Easter date Orthodox holidays: forgiveness Sunday, Start Lent, Palm Sunday, Ascension, Trinity (Pentecost) or Start Post Petrova deposited on the additional transparent disk or disk with slits.
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