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Galileo and Galilean Telescope

Description
Johannes Kepler (1571–1630)
Three laws of planetary motion
Orbits of the planets are elliptical
Planets revolve around the Sun at varying speed
There is a proportional relation between a planet’s orbital period and its distance to the Sun (measured in astronomical units (AU’s) – one AU averages about 150 million kilometers, or 93 million miles)

Galileo Galilei (1564–1642)
Supported Copernican theory
Used experimental data
Constructed an astronomical telescope in 1609
Four large moons of Jupiter
Planets appeared as disks
Phases of Venus
Features on the Moon
Sunspots
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