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
Blazar

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

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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