Astronomy » Amateur » Deep Sky Observing

Science, Astronomy, Amateur, Deep Sky Observing - Deep-Sky Org. Features a reference of Messier objects, telescope information, images, and deep-sky links.

https://www.deep-sky.org/

Messier45.com

Science, Astronomy, Amateur, Deep Sky Observing - Messier45. News, observing guide, references, download, deep sky maplet, list generator, other tools, and help guide.

http://messier45.com/