دانلود کتاب 2015 An Astronomical Year A Reference Guide to 365 Nights of Astronomy

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Designed for astronomers worldwide, The Astronomical Year details hundreds of astronomical events throughout 2015. Written by Richard J. Bartlett, a former freelance writer for Astronomy magazine, the guide includes almost daily data and information on the Moon and planets, as well as Pluto, Ceres, Pallas, Juno and Vesta: * The phases of the Moon * Conjunctions between the Moon, planets and asteroids. * Lunar and Solar eclipses * Annual summaries of when to observe the planets and asteroids * Annual summaries of notable close planetary conjunctions * Peak dates for the major meteor showers with moon phase * Dates of perihelion, aphelion, perigee and apogee for the planets and asteroids * Inferior and Superior conjunction for Mercury and Venus * Greatest Eastern and Western elongation for Mercury and Venus * Opposition and solar conjunction dates for the outer planets and asteroids * Apparent diameter changes for the planets * Magnitude changes for the planets and asteroids * Constellation changes for the Sun, planets and asteroids * Dates of the equinoxes and solstices The Astronomical Year is the essential guide for observers everywhere.