Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

How-To
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Observing Basics: Eyepieces

In this episode, Senior Editor Michael E. Bakich answers one of the most common eyepiece questions he receives: What do those numbers mean?
By Michael E. Bakich
What do the numbers mean?

Focal Length of your Telescope (in mm) / Focal Length of your Eyepiece (in mm) = magnification
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