And the year yielded some exciting discoveries on Earth's astronomical doorstep.
From the newscientist.com
The same thing happens when astronomical year numbering is used.
From the en.wikipedia.org
The exact length of an astronomical year changes over time.
From the en.wikipedia.org
An astronomical Julian year is never individually numbered.
From the en.wikipedia.org
This is the convention used in astronomical year numbering and in the international standard date system, ISO 8601.
From the en.wikipedia.org
The main purpose of the intercalary month is to correct for deviations of the calendrical year from the astronomical year.
From the en.wikipedia.org
In 1627 the German astronomer Johannes Kepler first used an astronomical year which was to become year zero in his Rudolphine Tables.
From the en.wikipedia.org
One calendar year would pass from, for example, 1 March 1 BC until 1 March AD 1. However, astronomical year numbering is different.
From the en.wikipedia.org
Numerical signs effectively form a new era, reducing the confusion inherent in any date which uses an astronomical year with an era named Before Christ.