LATER GREEK ASTRONOMY

used geometry

Aristarchus (310-230 BC)

determined relative size of moon during a lunar eclipse

At first said moon was half as size of Earth's shadow of Earth taper, wasn't as straight as he thought it was

Sun to moon is 87 degrees

Actual angle 89.85 degrees. Sun is actually about 390 times farther than the moon

Concluded 4 things

Sun bigger than moon and earth

Sun is farther from moon than earth

Earth and moon must revolve around sun

Heliocentric Universe- Sun is Center

Eratoshenes- calculated tilt of Earth

Hippochurnes

most works lost
catalouged magnitude of stars
described precession of Earth
catalouged positions and brightness of stars

Ptolemy

Ptolemaic System

Geocentric
Epicycles

Retrograde motion- plations apparent backward movement as viewed from Earth
planets revolves on epicycle
Epicycle accounts for retrograde motion worded and used for nearly 1, 500 years

The Dark Ages (1300-1400)

Scientific thought basically stopped
lost lots of information and thoughts
Christian Church did not support Greek ideas

Renaissance Astronomers

Coperenicus- fully developed heliocentric model
wrote on the revolution of celestial bodies
Sun is center and all planets orbit it
Counterclock wise rotation of Earth produces apparent motion of heaven
Annual motion of sun againsts backwards

	Erstellt von semon.adams vor mehr als 10 Jahre

Notiz am Astronomers, erstellt von semon.adams am 07/10/2013.