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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 .
Macarthur Heights is located in the local government area of the City of Campbelltown, New South Wales, Australia, 45 kilometres (28 mi) (direct line) south-west of the Sydney central business district. It is part of the Macarthur region and is located between the M31 Motorway and Western Sydney University.
Satellite photo of the Sydney (centre) area at night, facing west by northwest. Regional NSW areas can be seen on this map such as Wollongong in the Illawarra region can be seen at the bottom left, Bowral and Moss Vale in the Southern Highlands region can be seen in the far left, as well as Gosford in the Central Coast region is visible at the far right.
The app can show the map of the night sky in the past and future. In the iOS version, the app uses the camera for the augmented reality feature, combining the image data from the camera with the star map to give the user a real-time view of celestial objects. [3]
The night sky in Wisconsin glows with the Northern Lights as a geomagnetic storm brings vibrant pink and green colors to a majority of the northern states. / Credit: Ross Harried/NurPhoto via ...
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight , starlight , and airglow , depending on location and timing.
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