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 lenticular galaxy (also known as a S0 type galaxy) is a galaxy that is disc shaped with no real evidence of spiral arms. Their name derives from how they look when they are edge on – like the shape of a lens.
The field stop is the physical size of aperture available to look through on any given eyepiece.
The period during a transit or an eclipse when the smaller celestial body begins to cross the disc of the larger object. Egress marks the exit of the transiting or eclipsing body.