MOTION. ASTRONOMY The study of objects in space, including the moon, stars, and planets. Solar...
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Transcript of MOTION. ASTRONOMY The study of objects in space, including the moon, stars, and planets. Solar...
ASTRONOMY• The study of objects in space, including the moon, stars, and planets.
• Solar system
• Composed of the sun and the planets which travel around the sun.
• Galaxy
• A large group of stars (and solar systems) in space.
EARTH’S MOVEMENTS• Earth spins like a top on an imaginary line called its Axis.
• Earth’s axis is tilted 23.5 degrees.
• The spinning of Earth is called rotation.
• Rotation causes day and night.
• It takes Earth 24 hours to complete one rotation.
• Earth also travels around the sun in an elliptical, or oval orbit.
• This is called a revolution.
• The movement of one object around another.
• The path the Earth follows is called its orbit.
• One revolution of Earth around the sun is 365.25 days.
• Due to the tilt of her axis, different areas of Earth get direct sunlight at different times.
• When the Northern Hemisphere is tilted towards the sun, it receives more direct sunlight.
• Summer in the north, winter in the south.
• When the southern Hemisphere is tilted towards the sun, it receives more direct sunlight.
• Summer in the south, winter in the north.
• Summer solstice
• When the sun’s light reaches its farthest distance North of the equator.
• June 21st
• Winter Solstice
• When the sun’s light reaches its farthest point south of the equator.
• December 21st
• Spring and Fall Equinoxes
• Occurs when neither hemisphere is pointed directly at the sun (in-between the winter and summer solstices).
• Vernal Equinox-March 21st.
• Autumnal Equinox-September 22nd.