Evidence for the Earth Being Round

1
Evidence for the Earth Being Round
Comparison to other round astronomical Objects
Shadow During Lunar Eclipse
Ships Sinking Below Horizon
Circumnavigation of the Earth
Circumnavigate to travel around
Time Zones
Position of Celestial Bodies
Photos from Space
Nature of Gravity
No Evidence to the Contrary
2
Shadow During Lunar Eclipse
Aristotle used the round shape of the Earths
shadow during a lunar eclipse to argue for a
round shaped Earth
Why does the moon during a total lunar eclipse
have a red cast? We will discuss this in three
weeks.
3
Ships Sinking Below Horizon
Ships sink below the horizon, but can still be
viewed from higher elevations
4
Circumnavigation of the Earth
Circumnavigate to travel around
Traveling in any single direction will eventually
lead back to starting point
5
Time Zones
Time varies by longitudinal position
Sunrise 6 am
N
Sun
Noon
Midnight
Sunset 6 pm
6
Position 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
7
Shadows Cast by Sun on Earth
8
Photos From Space
9
Nature of Gravity
Gravity pulls equally in all directions. This is
why the earth is round.