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

These are powerful jets of radiation coming from the heart of a quasar (see ‘Quasar’) that we are viewing ‘head on’.

Danjon scale

A method of measuring lunar eclipse brightness, ranging from 0-4, darkest to brightest respectively. The Danjon scale is represented by the letter L.


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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