Holocene calendar
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The Holocene calendar, popular term for the Holocene Era or Human Era, is a year numbering system similar to astronomical year numbering but adds 10,000, placing its first year at the start of the Human Era (HE, the beginning of human civilization) the approximation of the Holocene Epoch (HE, post Ice Age) for easier geological, archaeological, dendrochronological and historical dating. The current Gregorian year can be transformed by simply placing a 1 before it (e.g., 2010 becomes 12010 HE). The Human Era was first proposed by Cesare Emiliani in 1993 (11993 HE).[1][2][3]
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[edit] Motivation
Cesare Emiliani's proposal for a calendar reform sought to solve a number of problems with the current Anno Domini era, which number the years of the commonly accepted world calendar. The issues include:
- The Anno Domini era (or Common Era) begins at the presumed year of the birth of Jesus Christ. This Christian aspect (especially the use of Before Christ and Anno Domini) can be offensive to non-Christians.[4]
- Biblical scholarship is virtually unanimous that the birth of Jesus Christ would actually have been a few years prior to AD 1[citation needed]. This makes the calendar inaccurate insofar as Christian dates are concerned.
- There is no year zero as 1 BC is followed immediately by AD 1.
- BC years are counted down when moving from past to future, thus 44 BC is after 250 BC. This makes calculating date ranges in the Holocene era across the BC/AD boundary more complicated than in the HE.
Instead, HE places its epoch or year one of the current era to 10,000 BC. This is a rough approximation of the start of the current geologic epoch, the Holocene (the name means entirely recent). The motivation for this is that human civilization (e.g., the first settlements, agriculture, etc.) is believed to have arisen entirely within this time. All key dates in human history can then be listed using a simple increasing date scale with smaller dates always occurring before larger dates.
[edit] Conversion
Conversion to the Holocene Era from Julian or Gregorian AD years can be achieved by adding 10,000. BC years are converted by subtracting the BC year from 10,001.
A useful validity check is that the last digit of BC and HE equivalents must add up to 1 or 11.
Events | Julian or Gregorian years |
Holocene Era Human Era |
End of the Paleolithic Period, All continents (except Antarctica) inhabited, Agriculture and the domestication of animals begins. |
c. 10000 BC | c. 1 HE |
Earliest walled city (Jericho) | c. 9000 BC | c. 1001 HE |
Initial Jōmon period begins | c. 7500 BC | c. 2501 HE |
First copper found in Middle East - beginning of Copper Age | c. 6000 BC | c. 4001 HE |
Begining of the 1st Baktun, in the Maya Long Count | August 11 or 13, 3114 BC | 6887 HE |
Narmer or Menes, first Pharaoh of the unified Egypt | c. 3100 BC | c. 6901 HE |
Beginning of Indus Valley Civilization | c. 3000 BC | c. 7001 HE |
Probable date of the completion of the first Egyptian pyramid | 2611 BC | 7390 HE |
Beginning of Xia Dynasty in China | c. 2100 BC | c. 7901 HE |
Moses leads the Hebrews out of Egypt | c. 1255 BC | c. 8748 HE |
Foundation of Rome | 753 BC | 9248 HE |
Cyrus II, king of Anshan and Persia | 559 BC | 9442 HE |
Death of Alexander; Ptolemy I Soter becomes Pharaoh of Egypt | 323 BC | 9678 HE |
Empire of Asoka | 273 BC | 9728 HE |
Imperial China, Qin dynasty | 221 BC | 9780 HE |
Destruction of Carthage and annexation of the Macedonian Kingdom by the Romans | 146 BC | 9855 HE |
Battle_of_Actium, defeat of Mark Anthony, Cleopatra's suicide, end of the Ptolemaic Egypt. | September 2, 30 BC | 9971 HE |
Augustus becomes the first Emperor of Rome | January 16, 27 BC | 9974 HE |
Birth of Jesus Chirst | 5 BC | 9996 HE |
Death of Herod_the_Great | Late March or Early April, 4 BC | 9997 HE |
Last year of BC era | 1 BC | 10000 HE |
First year of Anno Domini era | AD 1 | 10001 HE |
Possible year of Jesus' crucifixion | AD 30 | 10030 HE |
Migration Period begins, leading to the Fall of Rome | AD 300/476 | 10300/10476 HE |
Constantine converts to Christianism; defeats Maxentius | AD 312 | 10312 HE |
Edict of Milan: freedom of cult for the Christians. | AD 313 | 10313 HE |
Turkic migrations begin | c. AD 500 | c. 10500 HE |
Muslim conquests begin | AD 632 | 10632 HE |
The Muslins, under the Umayyad Caliphate, reach the Iberian Peninsula. | AD 711 | 10711 HE |
Great Zimbabwe built | c. AD 1000 | c. 11000 HE |
Hindu-Arabic numerals introduced to Europe | AD 1202 | 11202 HE |
Osman I becomes Sultan of the Ghazi state of Söğüt and establishes the Ottoman_Dynasty; | AD 1299 | 11299 HE |
Black Death decimates Asia and Europe | AD 1340s | 11340s HE |
European expansion and colonization begins | AD 1419 | 11419 HE |
Mehmet II, Sultan of the Ottomans, conquers Constantinople. | AD 1453 | 11453 HE |
European discovery of the New World | AD 1492 | 11492 HE |
Vasco da Gama reachs India, by sea, through circumnavigating the Africa | AD 1498 | 11498 HE |
Brazil is officially discovered and reclaimed by the Portuguese | April 22, AD 1500 | 11500 HE |
Fall of the Inca Empire | AD 1572 | 11572 HE |
America declares independence from Britain | AD 1776 | 11776 HE |
French Revolution | July 14, AD 1789 | 11789 HE |
Independence of Brazil and the Hispanic-American countries | AD 1811 / AD 1830 | 11811 HE / 11830 HE |
Second Industrial Revolution | c. AD 1850 | c. 11850 HE |
End of the Belle Époque; First World War | AD 1914-1918 | 11914-11918 HE |
Second World War and nuclear fission | AD 1939-1945 | 11939-11945 HE |
First artificial satellite (Sputnik I) | AD 1957 | 11957 HE |
Yuri Gagarin becomes The first human in space | AD 1961 | 11961 HE |
First human landing on the Moon | AD 1969 | 11969 HE |
Barack Hussein Obama becomes the first African-American President of the USA | January 20, AD 2009 | 12009 HE |
Current year | AD 2010 | 12010 HE |
End of the 13th Baktun, in the Maya Long Count | December 21, AD 2012 | 12012 HE |
[edit] See also
- Before Present
- Calendar Era
- Common Era
- Julian date (JD) – the interval of time in days and fractions of a day since January 1, 4713 BC Greenwich noon, Julian proleptic calendar.
[edit] References
- ^ Cesare Emiliani, "Calendar Reform", Nature 366 (1993) 716.
- ^ The Holocene Calendar at Meerkat Meade
- ^ The Human Era Calendar by Harry and Svetlana Weseman
- ^ Controversy over the use of "CE/BCE" or "AD/BC" dating notation at Religious Tolerance.org
- David Ewing Duncan (1999). The Calendar. pp. 331–332. ISBN 1-85702-979-8.
- Duncan Steel (2000). Marking Time: The Epic Quest to Invent the Perfect Calendar. pp. 149–151. http://books.google.com/books?id=fsni_qV-FJoC&printsec=frontcover&pg=PA149.
- Günther A. Wagner (1998). Age Determination of Young Rocks and Artifacts: Physical and Chemical Clocks in Quaternary Geology and Archeology. Springer. p. 48. http://books.google.com/books?id=ADuZDCa08kwC&pg=PA48.
- Timeline of World History
- "News and comment", Geology Today, 20/3 (2004) 89–96.
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