Solstices

At two point through out the year, the tilt of the Earth’s axis reaches its maximum angle compared to the Sun, and begins to move back the other direction. This usually happens around June 21 st, and December 21 st. These days are known as solstices. On these solstices the rays of the Sun shine directly on one of the two tropics. During the June Solstice the rays of the Sun shine directly on the Tropic of Cancer. During the December Solstice the Sun’s rays shine on the Tropic of Capricorn.

Equinoxes

As the Earth moves around its orbit it reaches two points during the year where the tilt of its axis causes it to be straight relative to the Sun. These days are known as equinoxes. During these equinoxes the rays of the Sun shine directly on the equator. This happens on approximately March 20 th, and September 22 nd.