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http://www.dnatube.com/video/29242/What-is-a-year-by-Minute-Physics
A sidereal year is the time taken by Earth to orbit the sun once.
Tropical year (also known as solar year) is the time that the sun takes to return to the same position in the cycle of the seasons.
The sidereal day is defined to be the length of time for the vernal equinox to return to your celestial meridian. The solar day is defined to be the length of time for the Sun to return to your celestial meridian. The two are not the same.