IUPAC definition : Non-SI unit of time, a 31556952 s. The year is not commensurable with the day and
not a constant. The value given corresponds to the Gregorian calendar year (a 365.2425
d).;
Non-SI unit of time, a 31556952 s. The year is not commensurable with the day and
not a constant. The value given corresponds to the Gregorian calendar year (a 365.2425
d).