What's in the Sky?

Brightness

How Many Constellations?

When can we see them?
 

Declination

Right Ascension

Circumpolar Stars

Star Trails

Star Charts

The Messier Catalogue

Observing Stars

Optical and True Binaries

Parallax

Apparent Magnitude

Absolute magnitude

Cepheid variables

Light Curves for Binaries

The Spectrum of a Star

O B A F G K M

The H R Diagram

The Life of Our Sun

Massive Stars

Nebulae

Neutron Stars and Black Holes