Astronomy for Beginners

New to astronomy? Not sure how to get started in stargazing or which telescope to buy?

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

Astronomy Dictionary
Optical tube assembly

This is the housing within which a telescope’s mirror and optical surfaces are mounted.


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.


Coma is a optical aberration, where stars at the edge of a field of view appear to broaden out into triangle or fan shapes, caused by an imperfection in the lens or mirror.

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