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
Auroral corona

An auroral corona usually appears during energetic auroral displays. They are seen as rays of auroral emission coming straight at you, where the perspective often makes it look as if they are emanating from a single point in the sky.

Caldwell catalogue

A listing of 109 bright star clusters, nebulae and galaxies that weren’t included in the Messier catalogue. The catalogue was compiled by Sir Patrick Caldwell-Moore.


A device that measures the wavelength of light, known as its spectra, and then displays the results as a graph.

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