Fugón Museum of Great People

Presenting: Renaissance Astronomers

Fugón Museum of Great People

(507) 645-2453

www.greatpeoplemuseum.org

Nicolaus Copernicus

Nicolaus Copernicus rejected Aristotle's geocentric model and came up with his own: The Heliocentric Model. Copernicus believed the sun was the center of the universe. Although, Copernicus believed that the orbits of the planets around the sun were circular. Copernicus published two books: Commentariolus, which talked about the moon revolving around the earth, and De Revolurionibus Orbium Coelestium. That book was banned by the Catholic Church for blasphemy.
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Galileo Galilei

Galileo discovered that the moons wasn't a perfect, smooth circle, rather than having it being filled with craters, mountains and valleys. He also discovered that the sun had sunspots. Galileo published a book called Siderius Nuncius, which talked about how the Milky Way was made of individual stars(no parallax effect). The book also talked about how the moon and son weren't perfect, unblemished bodies and how Saturn had "appendages".

Johannes Kepler

Kepler also believed in the Heliocentric Universe Theory. Kepler developed the three laws of planetary motion:

1. Ellipses-move along ellipses; sun being on the loci.

2. Areas-sweep equals areas around the sun in equal timeframes.

3. Periods-the square of the period is equal to the distance cubed.

Kepler also charted the orbit and position of many of planets.

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The Evolution from Geocentric to Heliocentric Models

Aristotle&Ptolemy's Geocentric Model

They believed earth was at the center of the universe. The sun and the orbited earth. Earth was motionless and had a complex system of epicycles.


Copernicus' Heliocentric Model

The rising and setting of the sun and moon and stars could be accounted for by a daily revolution of the earth. Copernicus simplified the number of epicycles to explain the backward motion of the planets.


Tycho Brahe Geocentric Model

All the planets, except for earth, orbited the sun. Although, Brahe believed that the sun still orbited the earth.


Kepler Heliocentric Model

Orbit shapes were ellipses. The planets are sometimes nearer the sun than other times. The planets move quicker when they are near the sun.

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