|rotation||The spinning of the Earth on it's axis. This causes day and night. It takes 24 hours or 1 day.|
|direction of Earth's rotation||Counterclockwise|
|revolution||The movement of the Earth in it's orbit around the sun. It takes 365 ¼ days or 1 year.|
|direction of Earth's revolution||Counterclockwise|
|Tilt of the Earth||23.5 degrees|
|Cause of seasons||The tilt of the Earth's axis and the orbit of the Earth around the Sun.|
|Angle of Insolation|| A measure of how high the Sun is in the sky. |
This affects us daily as well as seasonally.
The higher the angle, the warmer it is.
|3 words that make up insolation||INcoming SOLar radiATION|
|March 20th or 21st|| The spring equinox for the northern hemisphere. The sun is directly above the equator. |
Days begin to be longer and nights shorter in the northern hemisphere.
All around the world has equal day and equal night.
|June 21st or 22nd||The summer solstice in the northern hemisphere. The sun is directly above the Tropic of Cancer. It is the longest day of the year in the northern hemisphere.|
|September 22nd or 23rd||The fall (autumnal) equinox in the northern hemisphere. The sun is directly above the equator. Days begin to be shorter and nights longer in the northern hemisphere. All around the world has equal day and equal night.|
|December 21st or 22nd||The winter solstice in the northern hemisphere. The Sun is directly above the Tropic of Capricorn. It is the shortest day of the year in the northern hemisphere.|
|moon phases|| As the moon revolves around the Earth, the amount of sunlight on the side of the moon that faces the Earth changes. |
The different appearances of the moon due to its changing positions are called this.
|length of moon phase||It takes about 28 days for the moon to revolve around the Earth.|