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
Jovian moon

A natural satellite belonging to the gas giant Jupiter.

Celestial sphere

This is the name given to the projection of the night sky on to an imaginary sphere around the Earth. The astronomical co-ordinates of right ascension and declination are also mapped on to this sphere.


Faculae are brighter, more prominent patches of the solar photosphere (the ‘surface’ of the Sun). They are sometimes an indication of a forming sunspot and show up particularly well through white-light solar filters.