27.1 Observing the Night Sky

Observing the Night Sky

The three-dimensional perspective of the stars around us is explored followed by an introduction to two types of motion we see in observing the night sky. Duration: 5:41.

Celestial Motion

The eastward motion of the Moon is discussed followed by an introduction to two motions of stars apparent only on very long time scales. Duration: 5:37.

The Light Year

A perspective on how fast light travels is given followed by an introduction to the light-year, which is a basic unit of astronomical distances. Duration: 4:45.