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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.
As of 2008 The Stars: A New Way to See Them and a simplified presentation for children called Find the Constellations are still in print. A new edition of Find the Constellations was released in 2008, updated with modern fonts, the new status of Pluto, and some more current measurements of planetary sizes and orbital radii. [10]
Sigma Piscium (Sigma Psc, σ Piscium, σ Psc) is a main-sequence star in the zodiac constellation of Pisces.It has an apparent magnitude of +5.50, meaning it is barely visible to the naked eye, according to the Bortle scale.
Johann Bayer's Uranometria showing the constellation Orion. Orion the Hunter is star lore created by the ancient Greeks. Star lore or starlore is the creating and cherishing of mythical stories about the stars and star patterns (constellations and asterisms); that is, folklore based upon the stars and star patterns.
Beta Phoenicis (β Phoenicis, β Phe) is a binary star in the constellation Phoenix. Its apparent magnitude is 3.30, [2] meaning that it can be seen with the naked eye (see Bortle scale). The distance to Beta Phoenicis is poorly known.
Children's short stories are fiction stories, generally under 100 pages long, written for children. Subcategories This category has the following 4 subcategories, out of 4 total.
Constellations: Stories of the Future (1980) is a science fiction anthology of short stories edited by Malcolm Edwards and published by Gollancz. Contents [ edit ]