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
Colour fringing

Another name for chromatic aberration.


The phase of a moon or planet when the illumination of the disc is greater than half the planet or moon’s visible disc but less than full.

Artificial star

This is simply an artificial point of light used to test the optics of a telescope in the absence of, or instead of, a suitable real star for collimation and other adjustments.

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