Ptolemy (Wikipedia)Claudius Ptolemy (/ˈtɒləmi/; Greek: Πτολεμαῖος, Ptolemaios; Latin: Claudius Ptolemaeus; c. 100 – c. 170 AD) was a Roman mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importance to later Byzantine, Islamic, and Western European science. The first is the astronomical treatise now known as the Almagest, although it was originally entitled the Mathēmatikē Syntaxis or Mathematical Treatise, and later known as The Greatest Treatise. The second is the Geography, which is a thorough discussion on maps and the geographic knowledge of the Greco-Roman world. The third is the astrological treatise in which he attempted to adapt horoscopic astrology to the Aristotelian natural philosophy of his day. This is sometimes known as the Apotelesmatika (lit. “On the Effects”) but more commonly known as the Tetrábiblos, from the Koine Greek meaning “Four Books”, or by its Latin equivalent Quadripartite.
John C. Calhoun (Wikipedia)John Caldwell Calhoun (/kælˈhuːn/; March 18, 1782 – March 31, 1850) was an American statesman and political theorist who served as the seventh vice president of the United States from 1825 to 1832. Born in South Carolina, he adamantly defended American slavery and sought to protect the interests of white Southerners. Calhoun began his political career as a nationalist, modernizer and proponent of a strong federal government and protective tariffs. In the late 1820s, his views changed radically, and he became a leading proponent of states’ rights, limited government, nullification, and opposition to high tariffs. Calhoun saw Northern acceptance of those policies as a condition of the South’s remaining in the Union. His beliefs heavily influenced the South’s secession from the Union in 1860 and 1861. He was the first of two vice presidents to resign from the position, the second being Spiro Agnew, who resigned in 1973.
Krypton (Wikipedia)Krypton (from Ancient Greek: κρυπτός, romanized: kryptos ’the hidden one’) is a chemical element; it has symbol Kr and atomic number 36. It is a colorless, odorless noble gas that occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. Krypton is chemically inert.
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