Masonic Group		Abbreviation		Full Name		Translation		How Computed		Rationale
Holy Royal Arch Knight Templar Priests		A.O.		Anno Ordinis		Year of the Order		Current year -1,686		This Order is said to have been revived in 1686 A.D.
Knights Templar Commandery		A.L.		Anno Lucis		Year of Light		Current year -1,118		The medieval Knights Templar Order was founded in 1118 A.D.
Common practice		A.D.		Anno Domini		Year of Our Lord		Current year		Birth of Jesus Christ (which actually probably took place around 4 B.C.)
Royal Arch Freemasonry		A. Inv.		Anno Inventionis		Year of the Discovery		Current year +530		The 2nd Temple in Jerusalem was begun in 530 B.C., and it is said that certain items were discovered then.
Cryptic Masonry Royal & Select Masters		A. Dep.		Anno Depositionis		Year of the Deposit		Current year +1,000		King Solomon's Temple is said to have been completed in 1,000 B.C., and certain items are said to have been deposited then.
Order of High Priesthood		A.B.		Anno Benefacionis		Year of Blessing		Current year +1,913		Year Abraham was blessed by the High Priest Melchizedek, (1913 B.C.)
Scottish Rite - Pre September		A.M.		Anno Mundi		Year of the World		Current year +3,759		Same as the Hebrew calendar, from the supposed creation of the world in 3760 B.C.
Scottish Rite - Post September		A.M.		Anno Mundi		Year of the World		Current year +3,760		Same as the Hebrew calendar, from the supposed creation of the world in 3760 B.C.
Craft Lodges		A.L.		Anno Lucis		Year of Light		Current year +4,000		Bishop Ushercomputed the world began in 4,000 B.C.