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Models of the Solar System 1. Geocentric Model of the Solar System Geo- Greek word for Earth Centric-Greek word for center In a Geocentric Model of the Solar System, Earth is at the center of the Universe. So the Sun, Moon, Stars and Planets are all revolving around Earth. In the Geocentric Model, Earth does not move, it doesn’t even rotate. Who was the first scientist to say that the Earth is not the center of the Solar System, but the Sun? Copernicus was first and then Galileo gave more evidence. What was Galileo’s evidence? 1. Galileo was the first to use the telescope to study the nighttime sky. He noticed that Jupiter had Moons that revolved around Jupiter and not Earth. 2. Galileo also observed the different phases of Venus- which demonstrates that Venus is revolving around the Sun 2. Heliocentric Model of the Solar System Helio- Greek word for Sun Centric- Greek word for Center So in a Heliocentric Model of the Solar System the Sun is in the center and all the planets are revolving around the Sun. In this model the Earth Rotates Which model is accepted today? How can you prove that Earth rotates? 1. Coriolis Effect 2. Foucault Pendulum 3. Star Trails 4. Day & Night Which of these 4 could not be explained by the Geocentric Model? Coriolis Effect- this phenomenon causes winds and other moving objects to get curved to the right in the Northern hemisphere and get curved to the left in the Southern hemisphere. - this is caused by Earth’s rotation Foucault Pendulum- a freely swinging pendulum will appear to move in a circle throughout the course of a day - It is not the pendulum that is really moving in a circle, it is actually the Earth moving in a circle beneath it.