Also the Jewish Calender is slightly off.
The Earth Revolved around the Sun in 365 Days 5 Hours 49 Mins
The Jewish Calender assumes the Rotation is 365 Days 5 Hours 55 Mins.
Might this have to do with the fact that days have got a fraction longer (due to earth’s rotation slowing)? Then you have negate this observation against the rate at which the earth’s orbit might be slowing down. I find anywhere that can definitely state whether the years have got fractionally longer over time. It also depends on what mean by year (tropical or sidereal).
The Jewish Calendar may have been exactly correct 1600 years ago or it might be the perfect average length of a year over the lifetime of our earth until moshiach.