PHYSSCI - 3

• earth is fixed at the center of the universe


  eudoxus model
• first geocentric model


  eudoxus model
• sphere with spheres(homocentric spheres) 


  system of 27 spheres
• 1 for stars

  2 each for sun moon

  4 each for planets


  system of 27 spheres
• each celestial motion is uniform and circular


  combination of circular motion results in apparent irregular motion of celestial bodies
• sphere thats aligned with northern and southern poles of earth 


  celestial sphere (black)
• ecliptic sphere (blue) 


  west to east motion
• sphere that casued the retrograde motion of the planets 


  planetary spheres (red and green)
• earth is fixed at the center of the universe


  aristotle model
• 55 concentric spheres centered on the earth


  aristotle model
• first heliocentric model of the universe


  aristarchus model
• constant angular velocity for each sphere


  aristotle model
• stars were on the outermost sphere


  aristotle model
• all planets revolve around the sun along circular paths


  aristarchus model
• moon receives light from the sun


  aristarchus model
• causes the outermost sphere to rotate in aristotle model


  prime mover
• sun is 300 times larger than the earth 


  aristarchus model
• stars - distant suns


  aristarchus model
• moon is the boundary between unchangung and perfect heaveb abd earth that is subject to decay


  aristotle model
• planets and stars 


  quintessence
• is closer to earththan the sun and is orbiting the earth

  moon
• earth is the center of the entire universe


  ptolemaic model
• sun is the center of the solar univerese


  copernican model
• each planet is moving in a small circle called an

  epicycle
• moving around a larger circle called


  deferent
• all celestial bodies revolve around the sun 


  copernican model
• sun is the closest star to the earth 


  copernican model
• stars are moving around another spheres outside the epicycle 


  ptolomaic model
• earth is the third planet from the sun


  copernican model
• remember this biatch


  ok

  
• the nearest star from earth 


  star
• only natural satellite of the earth 


  moon
• rise: east

  setting: west
• the position of this changes throughout the day


  moon
• diferent positions of the blacn throughout the day


  sun
• position of the blank during equinoxes and solstice


  sun
• during lunar eclipse, they observed that the earth's shadow is round


  moon
• this receives light from the sun


  moon
• first to discover that planets are visible in the sky


  tycho brahe
• tycho brahe


  sextant quadrant