And we have a secondary calendar that just counts the days since some arbitrary date approx 150 years ago. It shares its name with a calendar from 2000 years

And we have a secondary calendar that just counts the days since some arbitrary date approx 150 years ago. It shares its name with a calendar from 2000 years ago, but it's really named after the father of the guy who came up with it who was named after the guy who established the older calendar. Also, it's days start in the middle of the other calendar's days