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.

Equinox

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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