Barycenter / Hierarchy

When the moon revolves around the Earth, the Earth wobbles a little because the moon's gravity is tugging on it.

• Nutation
• Precession
• Barycenter
• Revolution

Slow, circular movement at the top of Earth's axis

• precession
• barycenter
• revolution

A wobble back and forth

• Rotation
• Nutation
• Revolution

Earth revolves around the sun

• Precession
• Rotation
• Revolution

The center of mass of an object

• Angle of Insolation
• Barycenter
• Equinox

Earth's orbit follows an elliptical path.

• Kepler's 1st law
• Kepler's 2nd law
• Kepler's 3rd law
• Nutation

When Earth orbits around the sun, it slows down when it is close to the sun. It speeds up its orbit when it is further from the sun. This is because the sun's gravity is stronger when you are closer to it.

• Kepler's 1st law
• Kepler's 2nd law
• Kepler's 3rd law
• Nutation

The order of the planets is:

• Mars,Venus,Earth,
  Mercury,Saturn
  Jupiter, Uranus, Neptune
• Earth,Venus,Mars
  Jupiter, Neptune,
  Mercury,Saturn,
  Uranus
• Mercury,Venus,Earth
  Mars,Jupiter,
  Saturn,Uranus
  Neptune

The point in the earth's orbit where it is closest to the sun and moves the fastest.

• aphelion/apogee

• perihelion/perigee

The point in the earth's orbit where it is farthest to the sun and moves the slowest.

• aphelion/apogee

• perihelion/perigee