Year Zero

The ghost year zero.

There is common usage (AD, BC), politically correct usage (BCE, CE) and then there is the astronomical counting of years. In archaeology there is YBP (Years Before Present).

In sixth century Europe, the concept of “zero” was still unknown. Thus, the year 1 BC was followed by the year AD 1. …… The convention is that “BC” is a suffix (used after the year) while “AD” is a prefix (used before the year). …. ….. (This has been replaced by) the use of the religiously neutral abbreviations BCE (for “Before Common Era”) to substitute for “BC,” and “CE” (for “Common Era”) to replace “AD.” These secular terms are both used as suffixes making them better suited to computer generated tables.

The “astronomical” dating system refers to an alternative method of numbering years. It includes the year “0” and eliminates the need for any prefixes or suffixes by attributing the arithmetic sign to the date. Thus, the astronomical date for 2000 CE is simply +2000 or 2000. The astronomical year 0 corresponds to the year 1 BCE, while the astronomical year -1 corresponds to 2 BCE. In general, any given year “x BCE” becomes “-(x-1)” in the astronomical year numbering system. Historians should take care to note the numerical difference of one year between “BCE” dates and astronomical dates. — NASA

Counting the years




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