Reason for the Seasons
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Transcript of Reason for the Seasons
Reason for the Seasons
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The moon rotates on it’s axis once every 27 days – revolves around the Earth every 27 1/3 days
The Earth revolves around the Sun once every 364 ¼ days. The revolution around the sun
is called orbit. The Earth rotates on its axis
once every 24 hours (once a day)
Earth is tilted on a 23 ½ degree axis
Counter-clockwise rotation of Earth; Earth revolves counter-clockwise around the sun.
Solstices - days when Earth is most tilted towards the sun; June 21 or away from the sun December 21.
Equinoxes – Days when Earth is not tilted and sun directly over the equator – 2 days when hours of daylight almost equal hours of darkness.
Day and Night• Light can only travel in a
straight line. It cannot travel around the curvature of the Earth to illuminate the other side.
• The Earth’s own shadow makes the night side of the Earth dark
• One half of the Earth is always lit, while the other side is in darkness
• The line between the lit portion of the Earth and the dark side of the Earth is called the Terminator