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The Bortle dark-sky scale (usually referred to as simply the Bortle 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 .
Zodiacal light seen behind the Submillimeter Array from the summit of Mauna Kea. In the mid-latitudes, the zodiacal light is best observed in the western sky in the spring after the evening twilight has completely disappeared, or in the eastern sky in the autumn just before the morning twilight appears.
Groveland is currently retrofitting old streetlamps with dark-sky-friendly lights, which are shielded downward with a low color temperature with the goal to replace every light fixture by 2027. [21] In 2023, the City of Groveland became the first certified International Dark Sky Community in Florida and the Southeast US.
The aurora borealis was visible as far south as Florida on Thursday. Photos show the sky lit up in red and purple, even in some brightly-lit areas like New York City and Chicago .
On May 10, Florida residents were treated to the spectacular sight of the northern lights, compliments of strong solar flares. See what you missed.
The limiting magnitude will depend on the observer, and will increase with the eye's dark adaptation. On a relatively clear sky, the limiting visibility will be about 6th magnitude. [2] However, the limiting visibility is 7th magnitude for faint stars visible from dark rural areas located 200 km (120 mi) from major cities. [3] (See the Bortle scale
The holes in the sky may be more visible in the winter when the freezing layer in ... NASA highlights unusual holes in sky near South Florida called fallstreak holes ... This image was from Jan ...
A dark-sky preserve status enables high-quality astronomical observation in Paranal Observatory. [1] A dark-sky preserve (DSP) is an area, usually surrounding a park or observatory, that restricts or reduces light pollution or maintains and protects naturally dark night skies. Different terms have been used to describe these areas as national ...