A unit of time, a version of the year defined in terms of the SI second = 31 556 925.445 seconds.
Norman E. Holden, Mauro L. Bonardi, Paul De Bière, Paul R.
Renne and Igor M. Villa.
IUPAC-IUGS common definition and convention on the use of the year as a derived unit of time (IUPAC Recommendations 2011)
Pure and Applied Chemistry, vol. 83, no. 5, pages 1159-1162 (2011).
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Last revised: 5 May 2011.