The Bortle scale
The Bortle scale is a nine-level rating system used to describe the brightness of the night sky. The scale ranges from Class 1 (Excellent Dark-Sky …
Skills and Knowledge
What is light pollution
Light pollution refers to excessive, misdirected, or obtrusive artificial light, typically from outdoor lighting sources such as street lights, building lighting, and advertising displays, that …
What planets can I see from Ireland
A planet is a celestial body that orbits around a star, is spherical in shape, and has cleared its orbit of other debris and smaller …
What is a deep sky object
A deep sky object refers to astronomical objects that are not individual stars or Solar System objects, such as planets, moons, and asteroids. These objects …