24 hours deviation ?

Question

It is known that earth complete one in 23 hours and 56 min. so it is about 4 minuts , so in 360 days the deviation is whole day , how we don't feel it ?

Its couldnt be leap year - it 1/4 years , and because 365.25 days a year . (day=24 hours ) .
so peet explanation is right thats why the fixed stars mooved every day 4 min.
just the part with the sun now is clear .

but steel have a Q :
The Earth speed(around the sun) not costant . how is exactly 4 min. more in each day ?

Answer 1

There is a difference between what we call Synodic and Sidereal time.

The sidereal rotation of the Earth is the figure above: 23 hrs, 56 mins. This is the time that it would take for the same star (not the sun) to be directly above us. It is one complete rotation relative to the universe.

But the Earth has moved in relation to the sun in this time (from Earth it looks like the sun has moved... same thing). The sun's position in the sky has moved just under a degree. That means that the earth has to spin another 4 minutes just to catch up to where the sun is. So the Synodic day (the amount of time it takes for the sun to be in exactly the same spot in the sky) is 24 hours.

Answer 2

You're right, the Earth's speed around the Sun is not constant. Nor is the rotation speed of the solid Earth. 4 minutes per day is an average. Look at your original question. Even you say "about 4 mins."

I don't know what you mean by "feeling it," but the result is that after one year, we have 365 days in the calendar when the Earth has actually rotated 366 times.

You're right; leap years and the Gragorian calendar have nothing to do with it.

Answer 3

We would feel it, except that every 4 years we add a day for leap year to make up the difference.

Answer 4

Pope Gregory XIII felt it so in 1852 he sanctioned that 10 days were erased from the calendar. People went to sleep on october 4th, and next day was declared october 15th, like nothing had happened.

Answer 5

It's compensated for with leap years.