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Most associated with the ancient greek world view


Rejected the Geocentric world view and supported the Heliocentric view


Accurately determined the size of the Earth


Wrote the Almagest

Geocentric Model

A representation of the universe in which starts and planets revolve around Earth
Ptolemy proposed the model

Heliocentric Model

The accepted model of our solar system with the sun in the center


Heliocentric world view

Tycho Brahe

Last astronomer without a telescope
Provided Kepler with the data needed in order to develop his three Laws

J. Kepler

Three Laws of Planetary Motion
With the universal law of gravity and Newtons laws (especially the 2nd), you can can get all Keplers laws

Kepler's 1st Law

Law of Ellipses:
The orbit of a planet is an ellipse where one focus of the ellipse is the sun

Kepler's 2nd Law

Law of Equal Areas:
A line from the planet to the sun sweeps out equal areas in equal amounts of time

Kepler's 3rd Law

Law of Harmonies:
The period of a planet's orbit squared is proportional to its average distance from the sun cubed
P^ = a^


1st astronomer to use a telescope
Used a telescope and challenged the conventional wisdom of the motion of objects and the nature of the heavens

Galileo's Observations

(a and b below challenged the geocentric model, c and d challenged the idea that the heavenly object were perfect)
Telescope observations:
a) Phases of Venus
b) Moons of Jupiter
c) Sunspots
d) Mountains on the Moon


Three Laws of Motion and universal Law of Gravity

Newton's 1st Law of Motion

Law of Inertia:
A body remains at rest, or moves in a straight line (at a constant velocity), unless acted upon by a net outside force

Newton's 2nd Law of Motion

F = ma:
The acceleration of an object is proportional to the force acting upon it

Newton's 3rd Law of Motion

Law of Reciprocal Actions:
For every action, there is an eq:ual and opposite reaction.

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