## Ptolemy's AlmagestPtolemy's "Almagest" is one of the most influential scientific works in history. A masterpiece of technical exposition, it was the basic textbook of astronomy for more than a thousand years, and still is the main source for our knowledge of ancient astronomy. This translation, based on the standard Greek text of Heiberg, makes the work accessible to English readers in an intelligible and reliable form. It contains numerous corrections derived from medieval Arabic translations and extensive footnotes that take account of the great progress in understanding the work made in this century, due to the discovery of Babylonian records and other researches. It is designed to stand by itself as an interpretation of the original, but it will also be useful as an aid to reading the Greek text. |

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It was very useful in studies of ancient cultural as well as ancient math.

### Contents

On simultaneous risings of arcs of the ecliptic and equator at sphaera obliqua | 90 |

Layout of the tables of risingtimes from parallel to parallel2 | 99 |

On the angles between the ecliptic and the meridian | 105 |

Copyright | |

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### Common terms and phrases

ABGD Alexandria Almagest amount Angle Hour Angle West Angle apogee apparent approximately Arc East Angle arc EH argument calculations circle about right-angled column computed Corrected by Manitius corresponding chords Crd arc derived diameter difference drop perpendicular earth East Angle West eccentre ecliptic Egyptian calendar epicycle epoch equal equation of anomaly fixed stars Furthermore given gnomon greatest elongation HAMA Heiberg Hence Hipparchus horizon Hour Arc East hypotenuse inclined circle increment interval Kallippic latitude longest day lunar eclipses mean motion mean position Mercury meridian mid-eclipse midnight moon moon's motion in longitude Nabonassar observations opposite parallax parallel perigee planet poles Ptolemy Ptolemy's quadrant radius ratio rear revolution right angles right-angled triangle rising-times Scorpius seasonal hours semi-circle shadow solar days speed sphaera recta spring equinox subtends subtraction summer solstice sun's syzygies theorems time-degrees true longitude Venus zenith