## Practical Astronomy with Your CalculatorPractical 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 |

### What people are saying - Write a review

#### LibraryThing Review

User Review - Czrbr - LibraryThingBook Description: CAMBRIDGE UNIVERSITY PRESS. Very Good. Contains library information from University of Nebraska at Omaha. Read full review

#### LibraryThing Review

User Review - billsearth - LibraryThingBack in the days before computers, some work was done with calculators. Read full review

### Contents

Time | 1 |

The date of Easter | 2 |

Converting the date to the day number | 4 |

Julian day numbers | 6 |

Converting the Julian day number to the calendar date | 8 |

Finding the day of the week | 9 |

Converting hours minutes and seconds to decimal hours | 10 |

Converting decimal hours to hours minutes and seconds | 11 |

Sdenographic coordinates | 78 |

Atmospheric extinction | 82 |

The Sun | 83 |

Orbits | 84 |

The apparent orbit of the Sun | 85 |

Calculating the position of the Sun | 86 |

Calculating orbits more precisely | 89 |

Calculating the Suns distance and angular size | 92 |

Converting the local time to UT | 12 |

Converting UT to local civil time | 15 |

Sidereal time ST | 16 |

Conversion of UT to GST | 17 |

Conversion of GST to UT | 18 |

Local sidereal time LST | 20 |

Converting LST to GST | 21 |

Ephemeris time ET and terrestrial dynamic time TDT | 22 |

Coordinate systems | 25 |

Horizon coordinates | 26 |

Equatorial coordinates | 27 |

Ecliptic coordinates | 30 |

Galactic coordinates | 32 |

Converting between decimal degrees and degrees minutes and seconds | 33 |

Converting between one coordinate system and another | 34 |

Converting between right ascension and hourangle | 35 |

Equatorial to horizon coordinate conversion | 36 |

Horizon to equatorial coordinate conversion | 38 |

Ecliptic to equatorial coordinate conversion | 40 |

Equatorial to ecliptic coordinate conversion | 42 |

Equatorial to galactic coordinate conversion | 43 |

Galactic to equatorial coordinate conversion | 44 |

Generalised coordinate transformations | 45 |

The angle between two celestial objects | 51 |

Rising and setting | 52 |

Precession | 56 |

Nutation | 60 |

Aberration | 62 |

Refraction | 64 |

Geocentric parallax and the figure of the Earth | 66 |

Calculating corrections for parallax | 69 |

Heliographic coordinates | 72 |

Carrington rotation numbers | 77 |

Sunrise and sunset | 93 |

Twilight | 96 |

The equation of time | 98 |

Solar elongations | 100 |

The planets comets and binary stars | 101 |

The planetary orbits | 102 |

Calculating the coordinates of a planet | 103 |

Finding the approximate positions of the planets | 111 |

Perturbations in a planets orbit | 113 |

The distance lighttravel time and angular size of a planet | 116 |

The phases of the planets | 118 |

The positionangle of the bright limb | 119 |

The apparent brightness of a planet | 121 |

Comets | 123 |

Parabolic orbits | 130 |

Binarystar orbits | 133 |

The Moon and eclipses | 138 |

The Moons orbit | 139 |

Calculating the Moons position | 142 |

The Moons hourly motions | 146 |

The phases of the Moon | 147 |

The positionangle of the Moons bright limb | 149 |

The Moons distance angular size and horizontal parallax | 150 |

Moonrise and moonset | 151 |

Eclipses | 154 |

The rules of eclipses | 156 |

Calculating a lunar eclipse | 157 |

Calculating a solar eclipse | 161 |

The Astronomical Calendar | 164 |

Glossary of terms | 167 |

Symbols and abbreviations | 175 |

179 | |

### Common terms and phrases

360 to bring add or subtract altitude apparent arcsec ascending node ascension and declination Astronomical Ephemeris azimuth celestial body celestial sphere centre circle column vector comet convert to degrees coordinate conversion coordinate system correct quadrant decimal hours defined degrees/hour disc distance Earth eccentricity ecliptic coordinates ecliptic latitude ecliptic longitude Ephemeris epoch equatorial coordinates equinox Figure formulae Greenwich sidereal GST1 GST2 heliocentric horizon coordinates horizontal parallax hour-angle integer January 0.0 Julian date Julian day number Jupiter Kepler's equation lunar eclipse mean anomaly mean longitude mean Sun measured Method Example method given minutes and seconds Moon Moon's orbit multiples of 360 Multiply negative number of days observer parallax perigee perihelion phase point of Aries pole position-angle precession radians radius refraction right ascension rising and setting section 46 semi-major axis solar days solar eclipse Solar System star subtract 360 subtracting multiples Sun's Table Take inverse true anomaly