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
Supernumeraries

These are the faint rainbow bands seen on the inner edge of a rainbow. They appear when rain droplets in the rainbow are comparatively small and of a similar diameter to each other.

Catadioptric telescope

A telescope that contains both lenses and mirrors to focus light. Catadioptric telescopes include both Maksutov- and Schmidt-Cassegrain models.

Apparition

The period during which a planet is best placed for observation.