Astronomy for Beginners

Here’s where you’ll find observing guides, how-to articles and great astronomy hints and tips. Don’t forget to also check out our comprehensive astronomy dictionary.

Astronomy Dictionary
Eclipsing binary

A star with a companion that periodically passes in front of it, and eclipses it as seen from Earth.


The two times in the year when the Sun crosses the celestial equator.

Dwarf spheroidal

A dwarf galaxy that contains few stars and hardly any gas. Most of the Milky Way’s satellites are dwarf spheroidals.

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