Astronomy Ch. 2

He used geometric methods to (inaccurately) estimate the sizes of the Moon, Sun, and Earth, and the distances to the Moon and Sun.

• Aristarchus of Samos

• Pythagoras

• Aristotle

• Ptolemy

The measure of how large an object looks to you

• Parallax

• Angular size

• Retrograde motion

• epicycle

The shift in an object’s position caused by the observer's motion

• gravity

• Angular size

• Parallax

• Retrograde motion

Taught the Earth was a sphere because it was the perfect shape and the gods would have used it in the creation of the Earth

• Brahe

• Copernicus

• Eratosthenes

• Pythagoras

Noticed a ship moving away from the observer will move such that the hull is not seen, then the sails- proving the Earth is a sphere

• Kepler

• Aristotle

• Eratosthenes

• Galileo Galilei

First person to measure (almost accurately) the circumference of the Earth (25,000 miles)

• Kepler

• Pythagoras

• Eratosthenes

• Isaac Newton

Earth Centered

• geocentric model

• heliocentric model

Sun Centered

• geocentric model

• heliocentric model

The paths of the planets in the sky are tilted with respect to the celestial equator by...

• 23°

• 26°

• 30°

• .5°

The Sun, Earth, Moon, and planets all pass through the...

• Zodiac

• Astroid Belt

• Celestial Latitude