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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 .
John E. Bortle is an American amateur astronomer. He is best known for creating the Bortle scale to quantify the darkness of the night sky. Bortle has made a special study of comets. He has recorded thousands of observations relating to more than 300 comets. From 1977 until 1994 he authored the monthly '"Comet Digest" in Sky and Telescope magazine.
The Bortle scale is a nine-level measuring system used to track how much light pollution there is in the sky. A Bortle scale of four or less is required to see the Milky Way whilst one is "pristine", the darkest possible.
French Onion Potatoes au Gratin. Take your potatoes up a notch with this elegant side dish that's layered with savory caramelized onions and lots of melty cheese.
Chuck Woolery, the original host of Wheel of Fortune, has died.He was 83. Woolery died at his home in Texas with his wife present, his friend and Blunt Force Truth podcast co-host Mark Young ...
The darkness of the night sky is classified on the Bortle scale from 1 ("excellent", i.e., extremely dark) to 9 ("inner-city sky", i.e., partially dark). Hanle is categorised as an excellent dark astronomical site with Bortle colour key "Black". [9] The dark sky is important for the conservation of nocturnal animals and ecology.
Six-time Super Bowl champion Bill Belichick has agreed to become North Carolina's next football coach, a person with knowledge of the decision said Wednesday. UNC’s trustees must approve any ...
HD 147513 (62 G. Scorpii) is a star in the southern constellation of Scorpius.It was first catalogued by Italian astronomer Piazzi in his star catalogue as "XVI 55". [12] With an apparent magnitude of 5.38, [2] according to the Bortle scale it is visible to the naked eye from suburban skies.