Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak...

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Transcript of Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak...

Page 1: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

Ancient Greek Ancient Greek AstronomyAstronomy

Page 2: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

The First Greek The First Greek AstronomersAstronomers

The time when Greek astronomy was at The time when Greek astronomy was at its peak was between 700 BC-300 ADits peak was between 700 BC-300 AD

The Ancient Greeks, at first, were very The Ancient Greeks, at first, were very superstitious and believed that the superstitious and believed that the world was very supernatural but later world was very supernatural but later turn their theories around toward the turn their theories around toward the natural.natural.

The Greeks were not primitives and The Greeks were not primitives and only a few of them believed that earth only a few of them believed that earth was the center of the universe.was the center of the universe.

Page 3: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

Thales the AstronomerThales the Astronomer

Thales is considered Thales is considered the first Astronomer the first Astronomer and philosopher.and philosopher.

Thales is famous for Thales is famous for discovering why discovering why eclipses happened eclipses happened and that could predict and that could predict them.them.

Page 4: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

AnaximanderAnaximander

Anaximander was Anaximander was after Thales.after Thales.

He made many He made many advancements in the advancements in the idea of the sun was idea of the sun was larger than the earth.larger than the earth.

He believed that the He believed that the Sun was 27 times Sun was 27 times larger than the earth.larger than the earth.

Page 5: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

PythagorasPythagoras

Pythagoras thought Pythagoras thought that the universe that the universe could be explained could be explained with mathematics.with mathematics.

He was most likely He was most likely the first person to the first person to propose the idea of propose the idea of a round earth.a round earth.

Page 6: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

Some time in his life Some time in his life Pythagoras started a Pythagoras started a school of thought.school of thought.

His followers were called His followers were called the Pythagoreans.the Pythagoreans.

The Pythagoreans highly The Pythagoreans highly developed the cause of developed the cause of astronomy.astronomy.

They proposed that the They proposed that the earth wasn’t the center of earth wasn’t the center of the universe. The the universe. The Pythagoreans were the Pythagoreans were the first to develop this.first to develop this.

Page 7: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

PlatoPlato Plato was the student of Plato was the student of

Socrates.Socrates. He thought that He thought that

astronomy was only good astronomy was only good for studying nice things for studying nice things and for further developing and for further developing mathematics.mathematics.

Be cause of Plato the Be cause of Plato the development of development of astronomy halted for astronomy halted for some time.some time.

Page 8: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

Eudoxus of Cnidus Eudoxus of Cnidus

Eudoxus just built on Eudoxus just built on his predecessor's his predecessor's theories.theories.

He then formed He then formed theories with theories with mathematics and with mathematics and with out any observation so out any observation so his theories could his theories could have been proven have been proven wrong with simple wrong with simple observations. observations.

Page 9: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

AutolycusAutolycus

Autolycus started in astronomy in or Autolycus started in astronomy in or around 330 BC.around 330 BC.

Autolycus believed Eudoxus’ Autolycus believed Eudoxus’ theories.theories.

After Autolycus the center of After Autolycus the center of astronomy shifted from Athens to astronomy shifted from Athens to Alexandria.Alexandria.

Page 10: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

Aristarchus of SamosAristarchus of Samos Aristarchus tried to find the Aristarchus tried to find the distances of the heavenly bodies.distances of the heavenly bodies.When he tried to find the When he tried to find the distances of the sun and the distances of the sun and the moon he didn’t get any moon he didn’t get any conclusive data but it did show conclusive data but it did show that the sun was much farther that the sun was much farther than the moon.than the moon.Aristarchus also tried to find the Aristarchus also tried to find the sizes of the heavenly bodies.sizes of the heavenly bodies.Aristarchus found that the sun Aristarchus found that the sun was very large so he formed a was very large so he formed a model of the universe with the model of the universe with the sun in the middle. sun in the middle. Even though he was right the Even though he was right the people around him laughed at people around him laughed at him for his theory.him for his theory.

Page 11: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

EratosthenesEratosthenes

Eratosthenes Eratosthenes calculated the size of calculated the size of the earth and improved the earth and improved on Aristarchus’ on Aristarchus’ theories.theories.

In 240 BC In 240 BC Eratosthenes thought Eratosthenes thought that the earth was that the earth was 25,000 miles around. 25,000 miles around. He was only 1,000 He was only 1,000 miles off.miles off.

Page 12: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

HipparchusHipparchus

He was famous for He was famous for using science to using science to form his theories.form his theories.

He used He used trigonometry to trigonometry to find the distances find the distances of the heavenly of the heavenly bodies.bodies.

Page 13: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

Hipparchus used the Earth shadow Hipparchus used the Earth shadow during a lunar eclipse to find out how during a lunar eclipse to find out how far away the moon was.far away the moon was.

Hipparchus found out how long it took Hipparchus found out how long it took for the moon to revolve around the for the moon to revolve around the earth.earth.

He, in 129 BC, charted over 1080 He, in 129 BC, charted over 1080 stars.stars.

Hipparchus also discovered that it Hipparchus also discovered that it would take 26,000 years for the would take 26,000 years for the earth’s axis to rotate 360 degrees.earth’s axis to rotate 360 degrees.

Page 14: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

PtolemyPtolemy

Most of Ptolemy’s Most of Ptolemy’s work was based off work was based off of Hipparchus’ work.of Hipparchus’ work.

He disregarded the He disregarded the astronomers before astronomers before him and believed him and believed that the earth was that the earth was round but that it round but that it didn’t spin.didn’t spin.

Page 15: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

After Ptolemy there were no more great After Ptolemy there were no more great Greek astronomers. So Greek Astronomy Greek astronomers. So Greek Astronomy ended after Ptolemy.ended after Ptolemy.

Even though their time ended they paved Even though their time ended they paved the way for astronomers after them.the way for astronomers after them.

Page 16: Ancient Greek Astronomy. The First Greek Astronomers The time when Greek astronomy was at its peak was between 700 BC-300 AD The time when Greek astronomy.

The EndThe End


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