Phenomenon
Nutation
A small nodding of Earth's spin axis.
An 18.6-year wobble superimposed on precession, caused primarily by the Moon's gravity tugging on Earth's equatorial bulge.
Overview
An 18.6-year wobble superimposed on precession, caused primarily by the Moon's gravity tugging on Earth's equatorial bulge.
See also
Lunar Eclipse
When Earth's shadow falls on the Moon.
Transit
A small body crossing in front of a larger one.
Axial Precession
The slow wobble of a planet's rotation axis.
Van Allen Belts
Earth's twin doughnuts of trapped radiation.
Solar Eclipse
When the Moon stands between Earth and Sun.
Meteor Showers
Cosmic dust burning in our atmosphere.