The Earth and the Moon

1
The Earth and the Moon
2
Rotation vs. Revolutoin

• Earths rotation
• Causes the days we experience
• Also the night sky appears to rise in an easterly
  direction and set in a westerly direction
• Earths revolution
• Causes the length of year that we experience

3
Orbit and Tilt

• Earths orbit around the sun is elliptical in
  shape it looks like a stretched circle. This
  means that the earth is not always the same
  distance from the sun. This fact along with the
  fact that Earth rotates on an axis, which is
  tilted at 23.5 degrees causes the seasons

4
The motion of the Moon

• The moon is a natural satellite
• It is in orbit around Earth
• Appears to move across the sky from west to east
  with the starts as it orbits the Earth.
• The moon makes a complete orbit of Earth in 29.5
  days and as it rotates around Earth it makes only
  one rotations around its axis
• So the revolution and the rotation of the moon
  are the same (29.5 days)
• Because of this, we always see the same side of
  the moon

5
Moon Phases

• Are the monthly progression of changes in the
  appearance of the Moon, which is caused by the
  different proportions of the moon, which are lit
  by the sun and visible from Earth
• When the moon is waxing the area we can see is
  increase
• When the Moon is waning the area we can see is
  decreasing

6
4 Moon shapes

• Crescent
• Gibbous moon
• Quarter moon
• Full or New moon

7
Eclipses

• During a lunar eclipse the Earths shadow
  completely blocks the sun from the moon-looks
  reddish due to reflection of light off Earths
  surface
• Lunar eclipses occur approximately twice a year
  and are safe to watch
• The orbit of the moon is tilted approximately 5
  degrees to Earths orbit around the sun therefore
  the full moon usually passes above or below
  Earths shadow.