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.
A star with a companion that periodically passes in front of it, and eclipses it as seen from Earth.
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.
A method of measuring lunar eclipse brightness, ranging from 0-4, darkest to brightest respectively. The Danjon scale is represented by the letter L.