Bortle scale - Wikipedia
The Bortle dark-sky scale (usually referred to as simply the Bortle scale or sometimes Bottle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution .
Understanding the Bortle Scale - AstroBackyard
One of the easiest ways to identify the brightness of your night sky is to use the Bortle scale. A light pollution map will show that a large city radiates white to red from the center, and rural areas will appear green to blue.
Light Pollution Map - ClearDarkSky
2024年8月25日 · Light Pollution Map. Why is Light Pollution important? Light pollution limits the visibility of milky way to the unaided eye, the visiblity of nebulae and galaxies seen in telescopes, and raises the noise on CCD astrophotographs. Only the observation of …
A Complete Guide to the Bortle Scale for Stargazing
2024年10月2日 · The Bortle Scale is a simple, nine-level system that measures the darkness of the night sky in any given location, ranging from Class 1 (the darkest and clearest skies) to Class 9 (the most light-polluted, urban skies).
Gauging Light Pollution: The Bortle Dark-Sky Scale - Sky
2006年7月18日 · Excellent? Typical? Urban? Use this 9 step scale to rate the sky conditions at any site to examine the relationship between light pollution and astronomy.
Bortle Scale Chart: 2024 Easy Guide for Amateur Astronomers
2024年3月6日 · The Bortle Scale Chart (or Bortle Scale Map) is a tool used to measure the night sky’s brightness at a particular location. It was created by John Bortle, an amateur astronomer, to help other amateur astronomers evaluate the darkness of the sky and the visibility of celestial objects.
How To Use the Bortle Scale to Measure Night Sky Darkness
We can avoid it better by understanding the Bortle scale to learn where the darkest skies are and where our observing location ranks on the scale. Use the information in this article to plan your next dark-sky adventure!
Bortle Dark Sky Scale | Light Pollution Levels - Star Walk
2024年3月23日 · Our infographic shows how light-polluted your sky is. As a guide, we use the famous Bortle Scale. It's a handy system for indicating how dark or bright your sky is, from Class 9 (lots of city lights and almost nothing to see in the …
How to conduct a night sky quality survey - DarkSky International
2015年8月7日 · Bortle scale interpretation. The Bortle scale provides an estimate of sky brightness and helps in interpreting how light pollution is affecting one’s view of night sky phenomena. The lower the number is, the better the sky quality.
What Is The Bortle Scale? Light Pollution Classes Explained
2020年7月3日 · The Bortle scale defines the sky brightness using 9 classes. Here is a description of the Bortle Scale, together with the color code used in many light pollution maps to display the different classes on the map.