# Practical Astronomy with your Calculator

Cambridge University Press, 2 feb 1989
Practical Astronomy with your Calculator, first published in 1979, has enjoyed immense success. The author's clear and easy to follow routines enable you to solve a variety of practical and recreational problems in astronomy using a scientific calculator. Mathematical complexity is kept firmly in the background, leaving just the elements necessary for swiftly making calculations. The major topics are: time, coordinate systems, the Sun, the planetary system, binary stars, the Moon, and eclipses. In the third edition there are entirely new sections on generalised coordinate transformations, nutrition, aberration, and selenographic coordinates. The calculations for sunrise and moonrise are improved. A larger page size has increased the clarity of the presentation. This handbook is essential for anyone who needs to make astronomical calculations. It will be enjoyed by amateur astronomers and appreciated by students studying introductory astronomy. • Clear presentation • Reliable approximations • Covers orbits, transformations, and general celestial phenomena • Can be used anywhere, worldwide • Routines extensively tested by thousands of readers round the world

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### Indice

 The Solar The The The time The date ofEaster 3 Converting the date tothe day number Converting decimal hoursto Converting to thelocal UT 10 Converting UT tolocal civiltime Converting between angles expressed Horizon to equatorial coordinate
 67 Orbits The apparentorbitofthe Sun 46 Calculatingtheposition ofthe Calculatingorbitsmore precisely 48 Calculating theSuns distanceand angular size Sunrise andsunset Twilight The equation oftime elongations The planets cometsand binary stars

 Ecliptic to equatorial coordinate conversion Equatorial to ecliptic coordinate conversion Equatorial to galactic coordinate conversion Galactic toequatorial coordinate conversion 31 Generalisedcoordinate transformations 32 angle between two celestial objects 33 Rising andsetting 34 ... Aberration Refraction Geocentric parallax andthe figure of the Earth Calculatingcorrections for parallax Heliographic coordinates Carrington rotation numbers Selenographic coordinates Atmospheric extinction
 planetaryorbits 54 Calculatingthecoordinates of aplanet 55 Finding theapproximate positions oftheplanets 56 Perturbations ina planets orbit 57 distan... phasesofthe planets positionangle ofthe bright The apparent brightnessofa planet Comets Parabolic orbits Binarystar orbits Eclipses The Moons hourly motions phases oftheMoon positionangleof the Moons bright limb Moonrise and moonset rules of eclipses 73 Calculating a lunareclipse 74 Calculating a solar eclipse Copyright