The Earth-Moon-Sun System

Bell work Week 27 Pick a science word and write the definition. Chapter 20 TITLE OF NOTES: THE EARTH-SUN SYSTEM Pg.19, 20, & 21 RS Goal for lesson: write on your self assessment worksheet I can define rotation and revolution and how it relates to Earth

The Earth-Moon-Sun System People have always been fascinated by the changing positions of the sun and moon in the sky Prehistoric people, for example, built observatories The structure known as Stonehenge was probably an attempt to better solar predictions

The Earth-Sun System At the beginning of summer in the Northern Hemisphere (the summer solstice on June 21 or 22), the rising sun comes up directly above the heel stone of Stonehenge Besides keeping this calendar, Stonehenge may also have provided a method of

determining eclipses Earth Earth is the third planet from the sun. Only planet with free oxygen, oceans of water on the surface, and life. Formed roughly the same time as the sun about 4.6 billion years ago.

Earths Atmosphere Roughly 78 percent nitrogen and 21 percent oxygen Air surrounds Earth and gets thinner as you get farther from the surface The upper atmosphere expands during the day and contracts at night due to heating and cooling Motions of Earth The two main motions of Earth are rotation and revolution

Rotation is the turning, or spinning, of a body on its axis Revolution is the motion of a body, such as a planet or moon, along a path around some point in space Motions of Earth For example, Earth revolves around the sun, and the moon revolves around

Earth Earth also has another very slow motion known as precession, which is the slight movement, over a period of 26,000 years, of Earths axis Rotation The main results of Earths rotation are day and night Earths rotation has become

a standard method of measuring time because it is so dependable and easy to use Each rotation equals about 24 hours Noon is when the sun has reached its zenith, or highest point in the sky Revolution

Earth revolves around the sun in an elliptical orbit Its average distance from the sun is 150 million kilometers Earths distance from the sun varies Sunlight comes The from the sun to the Earth. Sun

The sunlight that warms our faces right now left the sun over eight minutes ago. The sun The Sun is the center of warms the Earth. the solar system Reaches 15 million Celsius Composed of hydrogen (70%) and helium (28%) It is almost a perfect sphere

Eventually the sun will engulf Mercury, Venus, and Earth and become a red giant Sunlight comes The from the sun to the Earth. Sun The sunlight that warms our faces right now left the sun over eight minutes ago. The sun Sunlight comes from the

warms the Earth. sun to the Earth. The sunlight that warms our faces right now left the sun over eight minutes ago. The two major forms of energy the sun provides are thermal (heat) and light energy.

Night falls when our part of the Earth turns away from the sun. The side facing away from the sun has nighttime. Changing seasons One revolution around the sun equals 365 days. This revolution causes the

changing of the seasons. When the Earth moves closer to the sun, summer returns. When the Earth moves farther away from the sun in its orbit, winter returns

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