Earth’s Movements
The moon revolves around the Earth- The Earth revolves
around the sun!
Rotation:
 Spinning of an object on an axis.
 Rotation causes the Earth to have night and day.
 How long does it take the Earth to rotate once?
o 24 hours or 1 day
Revolution:
 As Earth spins it orbits around the sun.
 It follows the same path around the sun called its orbit.
 Why are there 365 days in a year?
o The Earth spins 365 times as we revolve around
the sun.
 How long does it take Earth to revolve once?
o One year or 365 days
What an axis?
 An axis is an imaginary line through the Earth.
 Imagine a line going through the middle of the Earth
from the North Pole to the South Pole.
 This axis allows the Earth to spin the same way every
time.
Earth’s Tilt:
 Earth does not rotate straight up and down. Earth is
slightly tilted.
 We have seasons because of the Earth’s tilt.
 When the sun is pointed toward a hemisphere, it is
having summer.
 When the sun is pointed away from a hemisphere, it is
having winter.
 What would happen if the Earth was tilted even more
on its side?
o It would cause more hours of sunlight during
summer and less hours of sunlight during winter.
 How does Earth stay in orbit?
o The earth stays in orbit with the force of gravity.
o It acts like an invisible string holding it in place.
The Sun
 Our sun is a star located at the center of our Solar
System.
 It is a huge, spinning ball of hot gas that lights up
the Earth and provides us with heat.
 All the planets in the solar system revolve around
the sun.
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Earth
The third planet from the sun.
Earth has one moon.
It is the only planet known the support life.
Earth takes 24 hours or 1 day to rotate once.
Earth takes 365 days or 1 year to revolve once
around the sun.
The Earth has seasons because it rotates on its
axis.
Other Objects in the Solar System
 Asteroid: A rocky object orbiting the sun between
the planets.
 Meteor: A piece of rock or dust from space
burning up in Earth’s air.
 Meteorite: A rock from space that passed
through Earth’s air and landed on the ground.
 Comet: A frozen chunk of ice and dust that orbits
the sun.