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Jan. 4, 2012 - Foldable ( This is page one of your I- notebook!)

How earth moves -  The earth moves through space in two major way: rotation and revolution

Rotation -  The imaginary line that passes through the EARTH'S center and North and South poles is called the EARTH'S axis.

The spinning of the EARTH on its axis is called rotation.

Revolution -  EARTH  also travels around the sun. Revolution is the movement of one object around another. EARTH follows a path called an ORBIT.

Calendar -  System to organize time.

Seasons on Earth -  Most places outside of the tropic and polar regions have four distinct seasons:  winter, spring, summer and fall.

How sunlight hits the EARTH -  There is less direct sunlight on the north and south poles and more direct sunlight on the equator.

EARTH'S  tilted axis - EARTH has seasons because it's axis is tilted as it revolves around the sun. It is tilted at an angle of 23.5 degrees. The changes in seasons are not caused by the distance from the sun!EARTH IS FARTHEST FROM THE SUN IN SUMMER IN THE NORTHERN HEMISPHERE.

EARTH in June -  EARTH'S axis is tilted toward the sun. In the northern hemisphere the noon sun is high in the sky. More hours of sunlight and more heat than any other time of the year.

EARTH in December - Southern hemisphere receives most direct sunlight. Sun's rays are slanted in the northern hemisphere so few houres of sunlight. Winter: Northern! Summer: Southern!

Solstices -  Sun is at  greatest distance from the equator. June 21 and December 21

Equinoxes -  Halfway between the solstices, neither hemisphere is tilted toward or away form the sun. Equal night, equal day, day and night are 12 hours long. March 21 and September 22.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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