LESSON 1 ANCIENT ASTRONOMY

• Greeks were great scientist and mathematicians
• Ptolemy developed geocentric model with epicycles
• oblate spheroid the shape of the earth has equator and squeezed poles.
• solstice two line in the year, the summer solstice and the winter solstice. it marked longest and shortest days
• eclipse obscuring the light from one celestial body by the passage and its source of illlumanation.
• heliocentrism the earth and planets revolve around the sun.
• geocentrism its the solor system which earth assumed to be the center.
• Anaxagoras explain what causes the phase of the moon. according to him, the moon shone only by reflected sunlight.
• Eudoxus propose a system of fixed spheres. believeing that the sun, moon 5 planets and stars were attached to spheres which carried the heavenly bodies while it reloves around earth.
• Aristotle student of plato. the earth is spherical in shape that always costs curved shadow when it eclipse the moon. he believed that the earth was the center of the universe.
• Aristarchus a very 1st greek to state the heliocentrism. helios means sun, centric means centered.
• Eratosthenes the 1st sucessful attempt to determine the size of the earth was made of him. applying his geometric principles. Syene (now aswan) in the south and alexandria in the north.
• Hipparchus he observed and compared the brightness of 850 stars and arranged them into order of brightness or magnitude. he predict lunar eclipse for within a few hours.
• Claudius Ptolemy believing that the earth was the center of the universe. his ptolemic model moved in a complicated system of circles. geocentric model become known Ptolemic System.
• what are the 2 solstice?

  summer solstice and winter solstice
• A geocentric model become know as?

  Ptolemy system or ptolemy model
• Name the 8 greek ancient astronomers

  Anaxagoras

  Eudoxus

  Aristotle

  Aristarchus

  Erastothenes

  Hipparchus

  Claudius Ptolemy