Civil Engineering - Advanced Surveying - Discussion

One sidereal day is the time it takes for a star (in our case 'the sun') in the sky to come back to the same place in the sky. Because, for all intents and purposes, the sky is "fixed", a sidereal day is when the earth rotates 360°.

A sidereal day is 23 hours 56 minutes and 4.09 seconds long.

So a tropical year is 365.242 mean solar days long and 366.242 Sidereal days long.

The mean tropical year is approximately 365 days, 5 hours, 48 minutes, 45 seconds.

According to me, 365.2419 minute year it occurs in 72 years at one time in this year 20min shorter than the sidereal year.

Define tropical year and sidereal days?

Is it related to leap year?