The Tilt of the Earth

Posted by on Monday, November 14, 2016

Earth currently has an axial tilt of about 23.4°.

This value remains approximately the same relative to a stationary orbital plane
.
The obliquity of the ecliptic is not a fixed quantity. At present, it is decreasing at a rate of about 47″ per century.

Earth's axis remains tilted in the same direction with reference to the background stars throughout a year (regardless of where it is in its orbit). This means that one pole (and the associated hemisphere of Earth) will be directed away from the Sun at one side of the orbit, and half an orbit later (half a year later) this pole will be directed towards the Sun. 

This is the cause of Earth's seasons. Summer occurs in the Northern hemisphere when the north pole is directed toward the Sun.



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