Anno Lucis is Latin for "Year of Light" 

You may have seen Anno Lucis abbreviated as "A.L."  It is used as a calendar system within the Freemason fraternity.

Year of Light refers to the biblical account of the creation of the universe wherein God spoke and said: 

"Let there be light,...and there was light."  (Genesis 1:3)

You will often see the abbreviation "A.L." on Masonic certificates, plaques, and building cornerstones.  This calendar system is not exclusive to Freemasonry. 

It was designed as a simplification of the Anno Mundi calendar by an Irish cleric, James Ussher (1581-1656) nearly a century before the formation of the United Grand Lodge of England in 1717.  Ussher established the year 4004 B.C. (approximately 6014 years ago) as the date of the biblical creation of the Earth. 

James Ussher was Archbishop of Armagh, Primate of All Ireland, and Vice-Chancellor of Trinity College in Dublin; being highly regarded in his day as a churchman and as a scholar.

Of his many works, his treatise on chronology has proved the most durable. Based on an intricate correlation of Middle Eastern and Mediterranean histories and Holy writ, it was incorporated into an authorised version of the Bible printed in 1701, and thus came to be regarded with almost as much unquestioning reverence as the Bible itself.

Having established the first day of creation as Sunday 23 October 4004 BC, by the arguments set forth in the passage below, Ussher calculated the dates of other biblical events, concluding, for example, that Adam and Eve were driven from Paradise on Monday 10 November 4004 BC, and that the ark touched down on Mt Ararat on 5 May 2348 BC; which was on a Wednesday'.

 

Ussher's spellings have been faithfully kept in the following excerpt:

For as much as our Christian epoch falls many ages after the beginning of the world, and the number of years before that backward is not only more troublesome, but (unless greater care be taken) more lyable to errour; also it hath pleased our modern chronologers, to adde to that generally received hypothesis (which asserted the Julian years, with their three cycles by a certain mathematical prolepsis, to have run down to the very beginning of the world) an artificial epoch, framed out of three cycles multiplied in themselves; for the Solar Cicle being multiplied by the Lunar, or the number of 28 by 19, produces the great Paschal Cycle of 532 years, and that again multiplied by fifteen, the number of the indiction, there arises the period of 7980 years, which was first (if I mistake not) observed by Robert Lotharing, Bishop of Hereford, in our island of Britain, and 500 years after by Joseph Scaliger fitted for chronological uses, and called by the name of the Julian Period, because it conteined a cycle of so many Julian years. Now if the series of the three minor cicles be from this present year extended backward unto precedent times, the 4713 years before the beginning of our Christian account will be found to be that year into which the first year of the indiction, the first of the Lunar Cicle, and the first of the Solar will fall. Having placed there fore the heads of this period in the kalends of January in that proleptick year, the first of our Christian vulgar account must be reckoned the 4714 of the Julian Period, which, being divided by 15. 19. 28. will present us with the 4 Roman indiction, the 2 Lunar Cycle, and the 10 Solar, which are the principal characters of that year.

We find moreover that the year of our fore-fathers, and the years of the ancient Egyptians and Hebrews were of the same quantity with the Julian, consisting of twelve equal moneths, every of them conteining 30 days, (for it cannot be proved that the Hebrews did use lunary moneths before the Babylonian Captivity) adjoying to the end of the twelfth moneth, the addition of five dayes, and every four year six. And I have observed by the continued succession of these years, as they are delivered in holy writ, that the end of the great Nebuchadnezars and the beginning of Evilmerodachs (his sons) reign, fell out in the 3442 year of the world, but by collation of Chaldean history and the astronomical cannon, it fell out in the 186 year c Nabonasar, and, as by certain connexion, it must follow in the 562 year before the Christian account, and of the Julian Period, the 4152. and from thence I gathered the creation of the world did fall out upon the 710 year of the Julian Period, by placing its beginning in autumn: but for as much as the first day of the world began with the evening of the first day of the week, I have observed that the Sunday, which in the year 710 aforesaid came nearest the Autumnal Æquinox, by astronomical tables (notwithstanding the stay of the sun in the dayes of Joshua, and the going back of it in the dayes c Ezekiah) happened upon the 23 day of the Julian October; from thence concluded that from the evening preceding that first day of the Julian year, both the first day of the creation and the first motion of time are to be deduced.

— J. Ussher, The Annals of the World iv (1658)


James Ussher

 

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