Make that, one year = 365.00 x 24 x 60 x 60 = 31,536,000 seconds
“the formal definition in the International System of Units (SI):
1 second is defined to be exactly 9,192,631,770 cycles of a Caesium atomic clock.[1][2][3]”
Confused myself trying to account for leap years. In any case, the second, as a unit of time, is totally independent of earth’s (or any other body’s) orbital period.
So, “light year” is a misnomer, because year lengths vary?