Nutation

The center of mass between two objects. This is what the planets truly orbit.

• barycenter

• precession

• nutation

• ellipse

This movement changes the direction of the Earth's axis and will cause the north star to change over time.

• barycenter

• precession

• nutation

• ellipse

Earth's wobble cause by the gravitational pull from the Moon only. This changes the degree of the Earth's tilt and will cause seasonal changes.

• barycenter

• precession

• nutation

• ellipse

Due the the solar system's changing barycenter, the Sun is NOT stationary.

• true

• false

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

• precession
• barycenter
• revolution

A wobble back and forth in the Earth's path of precession.

• Rotation

• Nutation

• Revolution

The center of mass of an object

• Angle of Insolation
• Barycenter
• Equinox

The Earth's axis changes direction over time (but the angle of tilt does NOT change).

• Nutation

• Precession

• Barycenter

• Revolution

During precession, the Earth wobbles a little. This DOES change the angle of the axis which can have a slight effect on the severity of the seasons.

• Nutation

• Precession

• Barycenter

• Revolution

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

• Nutation

• Precession

• Barycenter

• Revolution