Week 2 : Earth's place in the universe

ancient, flat

During _ time, earth was perceived to be _

Orlando Ferguson

Who draw the flat earth map “map of square and stationary earth”

Ferdinand Magellan

Juan Sebastian Elcano

Navigators who were given credit for circumnavigating the world and proving that earth is not flat

Unaided eyes

before telescope astronomers only use their _ to observe the sky

Eudoxus of Cnidus

student of plato and considered as one of the best mathematicians and astronomers of the plato era

he gave the first systematic explanation of movements of the sun the moon and the planet

first astronomer to explain the retrograde motion of the planets in sky

Aristotle

he showed the universe was spherical and finite

he believed so because earth is too big to move thus it could not rotate

he believed that earth composed of four elements which are earth water fire and air

he further describe that each ring was in physical contact with one another

Aristarchus of Samos

Greek astronomer who made the first attempt to create a heliocentric model

Propose that earth rotates on its own axis and revolves around

Made three assumption

Claudius Ptolemaeus

He proposed model in which the center of the universe is the earth which is consistent aristotelian ideas

He explains that the moon the sun and other planet and even the stars where evolving around

Nicolaus Copernicus

The copernican model was based on aristarchus philosophy

The earth has three motion

• daily rotation, annual revolution, and annual tilting

Tyco Brahe

Danish astronomer

He was the last of major naked eye astronomers, working without the aid of any magnifying device to observe the heaven

Tychonian system

Where the sun is the center of the universe while the earth revolves around it

Galileo Galilei

Head the dutch telescope and started developing his own one

His observation of skies and credited the discovery of four largest satellites of the planet jupiter's which are called galilean moons

Johannes kepler

Improved copernican model. He used to observation of tycho brahe