I meant doesn’t change with respect to time zones. Leap times are still relevant in that scenario as each solar rotation doesn’t divide into a whole number of days and leap seconds due to variance in rotation.

With respect to the meridian I envision it rotating around the earth once per year, hence sidereal. So 0000 would rotate around the earth through the course of the year. Each day it would be one degree farther.

Most likely is I’m just completely full of shit.