GEOG 111 Lecture Notes - Lecture 2: Shortwave Radiation, Smog, Declination
Document Summary
Geog 111 - lectures three and four - 9/02 + 9/07. We measure space by light-years in space. The known observable universe in 12 billion light years in all directions. Heliocentricity: the sun is the center of the universe (the earth revolves around the sun) This theory was championed by copernicus but his work was suppressed by the church. Galileo initially championed copernicus" view but was eventually put in prison and had to recant. Our galaxy is about 100,000 light years across and our solar system 11 hours. The earth is about 150 million km from the sun at any given point. Closest to the sun during the perihelion on january 3rd when its 147 million km. Farthest during the aphelion on july 4th when its 152 million km. Plane of the ecliptic: the plane on which the earth revolves around the sun. The earth is tilted on it"s axis relative to this plane.
