Dating Systems
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Masonic Dating Systems

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Masonic Group
Abbreviation
Full Name
Translation
How Computed
Rationale
Common practice A.D.
Anno Domini
Year of Our Lord
current year
Said to date from the birth of Jesus Christ (which actually probably took place around 4 B.C.)
Craft Lodges
("basic" Freemasonry)
A.L.
Anno Lucis
Year of Light
add 4,000 to current year
It is said that Bishop Usher in 1611 computed that date the world began as 4,000 B.C. (actually he said 4,004 B.C.)
Royal Arch Freemasonry A. Inv.
Anno Inventionis
Year of the Discovery
add 530 to current year
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
add 1,000 to current year
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.
Knights Templar
Commandery
A.O.
Anno Ordinis
Year of the Order
subtract 1,118 from current year
The medieval Knights Templar Order was founded in 1118 A.D.
Scottish Rite A.M.
Anno Mundi
Year of the World
until Sept. add 3,759 to current year
after Sept. add 3,760 to current year
Same as the Hebrew calendar, from the supposed creation of the world in 3760 B.C.
Order of High Priesthood A.B.
Anno Benefacionis
Year of Blessing
add 1,913 to current year
Abraham is said to have been blessed by the High Priest Melchizedek in 1913 B.C.
Holy Royal Arch Knight Templar Priests A.R.
Anno Renascent
Year of Revival
subtract 1,686 from current year
This Order is said to have been revived in 1686 A.D.

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