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  2. Ptolemy's table of chords - Wikipedia

    en.wikipedia.org/wiki/Ptolemy's_table_of_chords

    The table of chords, created by the Greek astronomer, geometer, and geographer Ptolemy in Egypt during the 2nd century AD, is a trigonometric table in Book I, chapter 11 of Ptolemy's Almagest, [1] a treatise on mathematical astronomy. It is essentially equivalent to a table of values of the sine function.

  3. Gerald J. Toomer - Wikipedia

    en.wikipedia.org/wiki/Gerald_J._Toomer

    In particular, he translated Ptolemy's Almagest into English. Formerly a fellow of Corpus Christi College , Cambridge University , he moved to Brown University as a special student in 1959 to study "the history of mathematics in antiquity and the transmission of these systems through Arabic into medieval Europe."

  4. Almagest - Wikipedia

    en.wikipedia.org/wiki/Almagest

    An edition in Latin of the Almagestum in 1515. The Almagest (/ ˈ æ l m ə dʒ ɛ s t / AL-mə-jest) is a 2nd-century mathematical and astronomical treatise on the apparent motions of the stars and planetary paths, written by Claudius Ptolemy (c. AD 100 – c. 170) in Koine Greek. [1]

  5. Ptolemy's theorem - Wikipedia

    en.wikipedia.org/wiki/Ptolemy's_theorem

    More generally, if the quadrilateral is a rectangle with sides a and b and diagonal d then Ptolemy's theorem reduces to the Pythagorean theorem. In this case the center of the circle coincides with the point of intersection of the diagonals. The product of the diagonals is then d 2, the right hand side of Ptolemy's relation is the sum a 2 + b 2.

  6. Handy Tables - Wikipedia

    en.wikipedia.org/wiki/Handy_Tables

    Ptolemy's Handy Tables (Ancient Greek: πρόχειροι κανόνες, romanized: Procheiroi kanones) is a collection of astronomical tables that second century astronomer Ptolemy created after finishing the Almagest. The Handy Tables elaborated the astronomical tables of the Almagest and included usage instructions, but left out the ...

  7. 17 Genius Ways To Repurpose Leftover Soup - AOL

    www.aol.com/17-genius-ways-repurpose-leftover...

    1. Add to Grains. Turn yesterday’s soup into today’s healthy bowl. Start with a base of grains like rice, farro, or quinoa. Add roasted veggies and a protein.

  8. Family dogs kill 5-year-old California girl in backyard

    www.aol.com/family-dogs-kill-5-old-194408486.html

    A 5-year-old girl was killed by two of her family’s dogs and another person was injured in California on Sunday, according to local media. The dogs are a 10-year-old Rottweiler and a 6-year-old ...

  9. Trigonometry - Wikipedia

    en.wikipedia.org/wiki/Trigonometry

    In the 2nd century AD, the Greco-Egyptian astronomer Ptolemy (from Alexandria, Egypt) constructed detailed trigonometric tables (Ptolemy's table of chords) in Book 1, chapter 11 of his Almagest. [11] Ptolemy used chord length to define his trigonometric functions, a minor difference from the sine convention we use today. [12] (The value we call ...

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