This guidebook provides an introduction to the fascinating world of astronomy and the night sky. It covers the basics of telescope use, from choosing the right telescope for your needs to understanding the night sky and its constellations. It also provides tips on
From Wikipedia
A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally, it was an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects – an optical telescope. Nowadays, the word "telescope" is defined as a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.