Celestron Skymaps and Planisphere filter wheel black rubber armouring

black rubber armouring

you look at it

and actually fine optically polished flat to within 1/4 wave p-v over the entire surface

Diagonal: 6

You can even generate a Sky Tour of all the best celestial objects to view based on your exact time and location

Celestron Skymaps and Planisphere filter wheel black rubber armouringLearn the night skies of the Northern Hemisphere with Celestron Sky Maps! This classic collection of seasonal star charts, topped off by a glow in the dark luminous star finder, or planisphere, has been around for years and years! It continues to be so popular because beginning stargazers as well as seasoned amateur astronomers find that this book provides most everything they need to find constellations quickly and delve into seasonal night sky