Today’s Agenda

• Discuss moon logs

• Notes on Rotation and Revolution

Study Pack #1

Page 440

Today’s Goals…

• I can explain the difference between Earth’s rotation and revolution.

• I can explain what Earth’s rotation and revolution causes.

Rotation

• Axis – the imaginary line that passes through Earth’s center and the North and South poles

• Earth’s spinning on this axis is called its rotation

• A point on the equator rotates at about 1,600 km/h – faster than jets!!!

Rotation

• Earth’s rotation on its axis causes day and night

• The Earth rotates eastward so the sun appears to rise in the east and set in the west

• The Earth takes 24 hours to rotate once on its axis

Rotation

• When the Earth faces the sun it is daylight

• When the Earth faces away from the sun it is night

Rotation

Revolution

• The movement of the Earth around the sun is called revolution

• One complete revolution around the sun is called a year

• Earth’s path as it revolves around the sun is called its orbit– The Earth’s orbit is in an oval shape

Revolution

Calendars

• Why do we have leap year?– Earth’s orbit around the sun takes slightly more

than 365 days – actually about 365 ¼ days! – So every fourth year we have an extra day –

leap year!

Exit Slip!

• Put away your books and notes and show me what you learned !

• Create a T-chart to compare rotation and revolution!