earth motion quiz

Celestial Sphere Imaginary dome of the sky onto which all celestial objects are po
Celestial objects starts, constellations, moons/planets, galaxies
Real motion Actual motion of an object
Apparent motion How a celestial object appears to move based on our view from Earth
Celestial objects appear to rise in the… East
What path do celestial objects move across the sky? arc path(rate of 15 degrees per hour)
Where do celestial objects appear to set? West
What paths do starts appear to move in and around what? Counter-clockwise in circular paths around Polaris
Retrograde motion When over long periods of time planets and the moon tend to move west or east, or backwards
Altitude height of an object above the horizon measured in degrees
Azimuth Specific direction you look to see an object
Geocentric model Earth-centered Solar System
What happened in the geocentric model? Sun, moon, stars, and planets orbit the Earth
Heliocentric model Sun-centered Solar System
What happens in the heliocentric model? All planets orbit around the sun
What direction does the Earth rotate? West on it's axis
Period of rotation= 24 hours
What does rotation cause? Day and night
Coriolis Effect Since the Earth rotates, winds and moving water are deflected or curved?
What direction do winds and moving water reflect in the Northern Hemisphere? The Southern? Northern=right Southern=Left
Foucault Pendulum Freely swinging pendulum will "appear" to change direction over time
Why does the pendulum move? Rotation of the Earth
If a camera is pointed north, what will it record? Star Trails, or the paths of stars
What path do stars make? Arc paths
What does the Earth orbit around? The sun
What is the rate of the Earth's orbit? 1 degree per day
Period of Revolution= 365 and 1/4 days
Constellaations Groups of stars that seem to form images in space
Over the course of the year what happens to constellations? They appear and disappear in known cyclic patterns
What happens as the Earth orbits the sun? Seasons change
Why do seasons change? Because the Earth is tilted on it's axis and revolution
Apparent diameter How large a celestial object appears
What happens when a celestial object is close to the Earth? It appears larger
Kepler's First Law All planets revolve in elliptical(oval)orbits. NOT perfect circles
Earth's orbit is… Slightly elliptical
Ellipse An oval or flattened circle
How many focus points do ellipses have? 2 foci
Eccentricity Determines how oval or flat an ellipse is
More eccentric= More oval-shaped
What is the unit for eccentricity? There is none
What place does the number have to be written to? The thousandths place
What happens as foci move further apart? Eccentricity of an ellipse increases
Lowest possible eccentricity= 0.000(perfect circle)
Highest possible eccentricity= 1.000(straight line)
Kepler's Second Law All planets sweep out equal areas of space in equal amounts of time
What happens when a planet is closer to the sun? It speeds up due to an increase in gravity between them
What happens when a planet is further away from the sun? It slows down to a decrease in gravity
Kepler's Third Law The farther a planet is from the Sun, the greater it's Period of Revolution
Outer plantes Have longer orbital paths than inner planets and travel slower since the sun's gravitational pull is weaker
Gravity A strong attractive force between objects
The more massive or closer the two objects are… the greater the gravitational force between them
Why does Earth not get pulled into the sun? Inertia
What is the rule for an object in motion? It will continue moving in a straight line unless acted upon by an outside force-Gravity!
Gravity+Inertia= Revolution
What are the forces of Gravity and Inertia? Opposites
Gravity and Inertia are in… Perfect balacne
How long does the moon orbit the Earth? 27 1/3 days
How long does it take for the moon to complete one lunar cycle? 29 1/2 days
What does the moon's period of rotation equal? It's period of revolution
What shape is the moon's orbit? An ellipse
What does the moon not give off? It's own light
What light do we see from the moon? The light from the sun?
What is one half of the moon no matter what? Illuminated by the Sun
As the moon revolves around the Earth what happens? The amount of the lighted side we see on Earth changes
What creates high and low tides? The gravitational pull on the moon on the water of the Earth causes bulges of water
How many high and low tides are there in one day and how far apart is each one. 2 of each tide a day, about 6 hours apart
When do Spring Tides occur? New and Full Moon phases
Do Spring Tides produce the greatest or smallest tidal range? Greatest
Why do Spring Tides happen? Because of the combined forces of both the Sun's gravity and the Moon's gravity on Earth's water
When do Neap Tides occur? First and Last Quarter phases
Do Neap Tides produce the greatest or smallest tidal range? Smallest
Why do Neap Tides happen? Because of the divided forces of the Sun's gravity and the Moon's Gravity on Earth
When do Lunar Eclipses occur? When the full moon passes into Earth's shadow. Earth is between the Sun and the Moon temporarily blocking the Sun's light from hitting the Moon
What happens to the moon during a Solar eclipse during a Solar Eclipse? The moon is 400 times smaller than the Sun and 400 times closer to the Earth
what does the New moon pass between? The Earth and the Sun temporarily blocking the Sun's light from reaching a part of Earth's surface
What happens during an anmular eclipse? The New Moon is at apogee and it's apparent diameter is small. The sun appears as a very bright ring surrounding the outline of the Moon

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