Claudius+Ptolemy-+C





__Important Dates:__ __What Ptolemy did as and Astronomer:__ __Theory:__
 * Born approximately in 85 A.D.
 * Died approximately in 168 A.D.
 * Ptolemy made astronomical observations from Alexandria Egypt during the years 127-41 A.D.
 * Claudius Ptolemy was one of the most influential Greek astronomers, geographers, and mathematicians of his time
 * Claudius Ptolemy wrote treatises in his thirteen books
 * His most famous treatise was the //Almagest//
 * He developed a model of the universe known as the Ptolemaic System.
 * Claudius also discovered the irregularity of the moon's orbit
 * He claimed that everything in the universe moves either toward or around the Earth
 * Ptolemy's theory was that the Earth was in the center of the universe and all of the planets including the sun, revolved around it
 * His theory is known as the Ptomeaic Theory
 * Claudius Ptolemy's theory was correct for 1,500 years until proved wrong
 * __What Ptolemy did as a Mathematician:__**
 * **He contributed greatly to trigonometry**
 * **Ptolemy found the lengths of the seasons**
 * **Ptolemy's observations and theories are preserved in a 13-part work entitled //Mathematical Composition . //**
 * **His Almagest gives in mathematical detail the theories of the Sun, Moon, and planets**

__What Claudius Ptolemy did as a Geographer__ : __Check out our Voicethread:__ media type="custom" key="4889301"
 * He published a major work //Geography//, written in eight books
 * His books attempted to give coordinates of major places in latitude and longitude
 * Later the coordinates were found to be far off
 * Another one of his optics were in 5 books
 * In his optics he studied color, reflection, refraction, and mirrors of various shapes