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Physical Science 9.2b - Rotation and Revolution

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From the Physical Science class by Derek Owens. The rotation and revolution of the earth, the tilt of the earth, the seasons of the year.

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The movement of one object around

another. Earth follows a path which

revolves around the sun, called orbit.

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*Earth has seasons because its axis is tilted as it revolves around the sun.

*Time changes occur during Autumn and spring equinox's'.

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http://www.teachastronomy.com/ Many cultures have used a solar calendar, and, in fact, Sun worship was a basic part of ancient civilizations. Solar calendar divides the year into seasons using 4 fixed points.

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-The imaginary line that passes through Earth's center and the North and South poles is Earth's axis. Earth's rotation causes day and night.

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Rotation and Revolution

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-One of the first civilizations that created calendars were the ancient Egyptians. Their calendar wasn't exactly very accurate, but it worked at an extent.

-The ancient Egyptians counted the days between the years, which was 365 days. Later in history the Romans fixed this to make it more accurate by adding one day in March every four years to correctly correspond with the seasons. This addition of a day is called Leap Year. The Earth, in fact, orbits the sun in about 365 and 1/4 days.

-Over many years the Roman calendar gained changes as well. Pope Gregory XIII took off ten days of Spring because Spring came ten days too early on the calendar.

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Astronomy is the study of the moon, stars, and other objects in space.