Comment by sharkdp

So 'year' refers to the Gregorian year and is equal to 365.243 days [1]. We also have 'julian_year' which is equal to '365.25 days'.

We also have 'sidereal_day' equal to '23.9345 hours', and if you believe it is useful, we can also add 'sidereal_years'.

[1] https://numbat.dev/doc/list-units.html