ONE_YEAR is defined as 365.24225 days, but usually it is 365.2425 days

[tzccinct]

On Gregorian calendar, a mean year is 365.2425 days. But Time::Seconds defines ONE_YEAR as 365.24225 days.

Time-Piece/Seconds.pm

Line 28 in adc2264

ONE_YEAR => 31_556_930, # 365.24225 days

Time-Piece/Seconds.pm

Lines 242 to 244 in adc2264

	The methods make the assumption that there are 24 hours in a day, 7 days in
	a week, 365.24225 days in a year and 12 months in a year.
	(from The Calendar FAQ at http://www.tondering.dk/claus/calendar.html)

According to The Calendar FAQ,,

Isn’t there a 4000-year rule?

It has been suggested (by the astronomer John Herschel (1792-1871) among others) that a better approximation to the length of the tropical year would be 365969/4000 days = 365.24225 days.
(...snip..)
This rule has, however, not been officially adopted.

Why is an unofficial rule/value adopted in Time::Seconds? We might want to define ONE_YEAR as 365.2425 days.