...The Summer Solstice is at 12:04 am CDT tonight June 21...

Summer offically begins tonight at 12:04 am CDT June 21 in the northern hemisphere and simultaneously heralds the beginning of winter in the southern hemisphere. The earth spins around its axis, an imaginary line going right through the planet between the north and south poles. The axis is tilted somewhat off the plane of the earth's revolution around the sun. The tilt of the axis is 23.5 degrees; thanks to this tilt, we enjoy the four seasons. For several months of the year, one half of the earth receives more direct rays of the sun than the other half.

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