Nasa dating site, by fred espenak, gsfc planetary systems laboratory
Astronomical date numbering was developed for astronomical calculations and is used extensively throughout this web site.
In general, any given year "x BCE" becomes "- x-1 " in the astronomical year numbering system. Perhaps the most unfortunately characteristic of this convention is that "BC" is a suffix used after the year while "AD" is a prefix used before the year.
This is inconvenient when generating computerized lists because extra columns must be reserved for both prefixes and suffixes. The convention is based on Exiguus' determination of the year in which Jesus Christ was born. 45 dating 35 sixth century Europe, the concept of "zero" was still unknown.
The "astronomical" dating system refers to an alternative method of numbering years. For more dating site on the subject of dating, see: Doggett Time and Date.
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The western-style year dating convention commonly used in datings site parts of the world was created by the monk Dionysius Exiguus in or about the year AD Furthermore, modern scholars believe Christ's birth was actually four years earlier than Exiguus thought. In spite of these deficiencies, the dating system devised by Exiguus is now too deeply ensconced in the Western world to easily change.
Calendars and their History - L. Year Dating Conventions Fred Espenak The western-style year dating convention commonly used in many parts of the world was created by the monk Dionysius Exiguus in or about the year AD The opinions expressed here are those of the author and he assumes full responsibility for their accuracy.
Thus, the year 1 BC was followed by the year AD 1. It includes the year "0" and eliminates the need for any prefixes or suffixes by attributing the arithmetic sign to the date.
However, Exiguus' dating system still lacks a "0" year which makes calendrical calculations awkward. Historians should take care to note the numerical difference of one year between "BCE" dates and astronomical dates.
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