Presentation on theme: "Evidence for the Earth Being Round"— Presentation transcript:
1Evidence for the Earth Being Round Comparison to other round astronomical ObjectsShadow During Lunar EclipseShips Sinking Below HorizonCircumnavigation of the EarthCircumnavigate – to travel aroundTime ZonesPosition of Celestial BodiesPhotos from SpaceNature of GravityNo Evidence to the Contrary
2Shadow During Lunar Eclipse Aristotle used the round shape of the Earth’s shadow during a lunar eclipse to argue for a round shaped EarthWhy does the moon during a total lunar eclipse have a red cast? We will discuss this in three weeks.
3Ships Sinking Below Horizon Ships sink below the horizon, but can still be viewed from higher elevations
4Circumnavigation of the Earth Circumnavigate – to travel aroundTraveling in any single direction will eventually lead back to starting point
5Time Zones Time varies by longitudinal position Sunrise 6 am Sun Noon MidnightSunset6 pm
6Position of Celestial Bodies Use the North Star as an example. Someone on the north pole looks straight up to see the north star, while someone in Richmond looks at an angle to see the north star.Where does someone in the southern hemisphere see the north star?North Star