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44 Cards in this Set

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Who concluded that Earth was round because it casted a curved shadow on the moon?

Aristotle

Who calculated the circumference of the Earth and was really close to the actual circumference?

Eratosthenes

$Who cataloged the stars ,divided them into categories by brightness and measured the length of the year

Hipparchus

Who developed a method for predicting lunar eclipses

Hipparchus

What model did the greeks believe in ?

Geocentric

What is believed to be in the center in a Geocentric model ?

Earth is believed to be in the center in a Geocentric model

What is believed to be in the center in a Heliocentric model ?

The sun is believed to be in the center in a Heliocentric model

Who was the first Greek to believe in the Heliocentric model?

Aristarchus

Who published 13 volumes on astronomy?

Ptolemy

Who tried to explain the movements of the planet?

Ptolemy

What is the optical illusion that causes a planet to appear as if it is moving backward across the skyline?

Retrograde Motion

Who concluded that Earth was a planet,not the center of the universe?

Nicolaus Copernicus

Who made instruments to observe the night sky

Tycho Brahe

Who made observations of Mars?

Tycho Brahe

$Who established 3 laws of planetary motion?

Johannes Kepler

What are the 3 laws of planetary motion?

1.path of each plant is an ellipse


2.planets sweep equal areas areas in equal time-travel faster near the sun


3.the square of orbital period equal to cube of mean distance from sun

What is the average distance between Earth and the Sun?

Astronomical unit

Who was the 1st to use the telescope ?

Galileo Galiliei

Who discovered the 4 moons of Jupiter?

Galileo Galiliei

Who discovered the moon's surface was not smooth ?

Galileo Galiliei

Who discovered Venus has phases?

Galileo Galiliei

Who discovered the sun has spots?

Galileo Galiliei

$Who described the forces that hold the moon to the Earth ?(universal gravitation)

Sir Issac Newton

def- spinning on an axis

Rotation

def-traveling in a path around a point in space

Revolution

solar day=

24 hours

sidereal day=

23 hours 56 minutes and 4 seconds

Why do we use a solar day instead of a sidereal day ?

We use a solar day instead of a sidereal day because then in 6 months a "noon" would be midnight

the point in the orbit of a planet where it is closest to the Sun

Perihelion

the point in the orbit of a planet where it is farthest away from the Sun

Aphelion

a slow motion hat moves Earth's axis from one direction to the opposite direction

Precission

How long does it take for one complete precision of the Earth ?

It takes 26,000 years for one complete precision of the Earth

the point where the moon is closest to Earth

Perigee

the point at where the moon is farthest from Earth

Apogee

Why do we have lunar phases?

We have lunar phases because of the results from the moon's orbit and t he amount of light it reflects from the sun

What phase is it when the moon is between the Sun and the Earth? and what eclipse?

New Moon:solar eclipse

What phase is it when the Earth is between the Sun and the Moon?

Full Moon:lunar eclipse

Solar Month=

29 1/2 days

Sidereal Month=

27 1/2 days

What are round depressions on the surface of the moon ?

Craters

What are on the far side of the moon and light colored ?

highlands

What are dark, smooth mares and ancient beds of basaltic lava ?

Maria

What are long channels?

rilles

What causes a lunar eclipse to occur ?

A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra and it is aligned