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
Eclipsing binary

A star with a companion that periodically passes in front of it, and eclipses it as seen from Earth.

Mira variable

A red giant star that decreases and increases in brightness over a period of at least 100 days. It’s been shown that Mira variables can change brightness by as much as eight magnitudes.

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.

We use cookies to improve your experience of our website. Cookies perform functions like recognising you each time you visit and delivering advertising messages that are relevant to you. Read more here