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

The focuser is the small piece of mechanical equipment that holds the eyepiece. It is moveable to vary the distance between the eyepiece and the lens or mirrors to achieve focus. There are many different types of focuser on the market from simple rack-and-pinion devices to more elaborate double speed, feather-touch focusers.


Basins or impact basins are the results of massive impacts on a planetary surface. They appear as vast craters. Some lunar basins have been covered or partially filled by lava, which has later erupted from beneath the surface.

Chroma (or chrominance noise)

This is the blotchy variation in colour sometimes seen in DSLR images.

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