Bortleskyerklæringer

Bortleskyerklæringer, also known as Bortle scale sky quality meter readings, is a measure of the brightness of the night sky, developed by John E. Bortle in 2001. The scale ranges from Class 1, representing the darkest skies typically found in remote areas away from light pollution, to Class 9, indicating the brightest skies found in the heart of major cities. The scale is used by astronomers and stargazers to quantify the quality of the night sky and to assess the impact of light pollution on astronomical observations. The Bortle scale is based on the visibility of celestial objects, such as stars, constellations, and nebulae, and is designed to be easily understood and used by both amateur and professional astronomers. The scale is widely used in astronomy and is considered a valuable tool for assessing the quality of the night sky and the impact of light pollution on astronomical observations.