Advances in contemporary physics and astronomy --- our current understanding of the Universe Lecture 7: Physics of our star, the Sun May 21 th, 2003.

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Presentation transcript:

Advances in contemporary physics and astronomy --- our current understanding of the Universe Lecture 7: Physics of our star, the Sun May 21 th, 2003

Eratosthenes and the size of the Earth Eratosthenes 276 –194 BC Radius of the Earth ~ 6,300 kilometers

Hipparchus and the distance to the Moon Hippaarchus ( BC) the Moon was 59 times the radius of the Earth.

Aristarchus and the distance to the Sun Aristarchus of Samos Born: about 310 BC in Greece Died: about 230 BC in Greece Aristarchus was trying to calculate the distance between the Earth and the Sun by calculating angle of Sun-Earth-Moon when it is Half Moon. His angle, 87º is about 1.5º off the real value, 88.5º. His estimation is about 20 times smaller.

Solar system

Space exploration

References