Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
44 Cards in this Set
- Front
- Back
|
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 |
