Ch 3 Flashcards
1
Q
Geocentric Model
A
- Earth is at the center
- Everything orbits the Earth
- Objects move in small circles or epicycles around larger circles that form their orbit around Earth
2
Q
Heliocentric model
A
- Earth orbits sun
- Retrograde motion is explained
- elliptical orbits
3
Q
Retrograde motion
A
Planets seem to move from west when planets pass Earth
4
Q
Copernicus
A
Used a geocentric model of the solar system, but still had epicycles.
5
Q
Tycho
A
Made accurate observations and formulated his own theorem of a geocentric solar system
Unable to detect parallax
6
Q
Kepler
A
- Discoverd that objects orbiting are not perfect circles but ellipses
7
Q
Newton
A
- invented calculus
- discovered laws of motion
- universal law of graviation
8
Q
Galileo
A
- used newton’s law to refute that the earth isn’t moving
- supernova observed by tycho refuted the fact that the heaven’s are unchanging
- shows parallax of stars using a telescope proving that they were farther away
- observation of the phases of venus
9
Q
kepler’s 1st law
A
planets have elliptical orbits
10
Q
kepler’s 2nd law
A
a line from the planet to the sun sweeps out equal areas in equal intervals of time
11
Q
kepler’s 3rd law
A
p2 = a3
where p = orbital period and a = planet’s avg distance from the sun
12
Q
occam’s razor
A
best and most simple explanation or model to explain phenomena
13
Q
universal law of gravitation
A
