The difference is due to two reasons, the number of days, and the earth orbiting round a bit and added the gravitational pull of other planets that make our planet orientation changes.
This year, spring begins Saturday, March 20, because that is when the so-called vernal equinox occurs. Equinox (which marks the beginning of spring and autumn) and the solstices (which marks the beginning of summer and winter) is a point of time and space that marked the transition in the planet's annual trip around the sun.
The sun rises every day because the earth rotates on its axis once every 24 hours or more.
The existence of the season is the result of earth movement with a slope of 23.5 degrees rotating on its axis, coupled with the orbits around the sun for 365 days.
As the fourth century BC, ancient peoples in the Americas to make a giant calendar cycle about the sun.
They built observatories of stone as a marker, because it is important to begin to plant or harvest crops. Sacred places and even the grave is also designed with consideration of the sun.
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