# First Exam - Flashcards

## Flashcard Deck Information

 Class: PHYS 107 - ELEMENTARY ASTRONOMY - S Subject: Physics & Astronomy University: University of Louisville Term: Spring 2010
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 What is the horizon? An imaginary line that separates the half of the sky you can see from the half of the sky you can't see. How much of the sky is visible at any given time? Half People located at the ___ can see all the stars over the course of the day Equator Stars move parallel to the ____. Celestial equator
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 Stars rise in the ____ & set in the ____. East, West Stars rise in the East & set in the West. The point in the sky directly overhead. Zenith The imaginary circle through the celestial poles. Meridian Stars that never rise nor set but are always visible. Circumpolar star
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 Stars that are never visible are located... Below your horizon If you are exactly at the N or S pole, __ of the sky is visible. Exactly half How much time is there between when a star rises & when it sets? Depends on the star The extension of the Earth's equator out to the sky Celestial equator
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 The extension of the Earth's rotation axis to the sky Celestial poles The set of constellations the sun appears to move through. The zodiac It takes ____ for the sun to go through each constellation in the zodiac. 1 month Each day a constellation rises ___ in the day due to_____. Earlier. the direction of motion of the Earth in it's orbit.
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 The time it takes the Sun to return to the same point in the sky. Solar day The time it takes a star to return to the same point in the sky. Sidereal day A Sidereal day is exactly _____ shorter than a Solar day. 4 minutes The path through the stars that the apparent motion of the Sun traces out throughout the yr. The Ecliptic
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 Thirteen Zodiac constellations: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpius, Ophiuchus, Sagittarius, Capriconus, Aquarius, Pisces. The amount of time it takes the Earth to rotate exactly 360 degrees Sidereal day How many hours does it take the Earth to rotate 360 d. (Solar time)? Slightly less than 24 hours Are the sun, major planets, and Earth's orbits in similar planes? Yes
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 The slow change in the direction that the Earth's rotation axis makes compared to the stars Precession Which location experiences the smallest amount of change in sunlight over the yr? The equator TorF. Only 1 side of the moon is visible at all times. True Which phase of the moon occurs when the moon is on the same side of the Earth as the Sun? New Moon
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 Which phase of the moon occurs when the moon is on the opposite side of the Earth from the Sun? Full Moon The length of time between a repeat of a moon phase. Synodic period The synodic period of the Moon is ___. 29.5 days The synodic period of the moon is the time required for the moon to ___. return to the same phase once.
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 The ____ & ____ periods of the Moon are equal which is why we always see the same side of the moon. orbital, rotational The synodic period of the Moon is longer than the orbital period because ________. The Earth orbits the Sun counter-clockwise and the Moon orbits the Earth counter-clockwise If the moon is in last quarter (third quarter) it rises and sets at ____ & ____. midnight, noon The Moon is between the Earth & the Sun, so the Sun is in the Moons shadow. Solar eclipse
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 The Earth is between the Moon and the Sun, so the Sun is in the Earths shadow. Lunar eclipse What 2 planets lie closer to the sun than the Earth? Mercury, Venus Inner planets (2): Mercury. Venus "Normal" motion from West to East as seen against the background of stars. Prograde
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 Motion from East to West compared to the background of stars Retrograde Retrograde motion is caused by the ______ of the Outer planets by the Earth passing Where would you look to see a planet rise when it is in retrograde motion? Near the Western horizon A planet will, over the course of one night, appear to move ____ to ____. East, West
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 Approximately the plane of the orbits of the planet The ecliptic
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## List View: Terms & Definitions

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What is the horizon?An imaginary line that separates the half of the sky you can see from the half of the sky you can't see.
How much of the sky is visible at any given time?Half
People located at the ___ can see all the stars over the course of the dayEquator
Stars move parallel to the ____.Celestial equator
Stars rise in the ____ & set in the ____.East, West
Stars rise in the East & set in the West.
The point in the sky directly overhead.Zenith
The imaginary circle through the celestial poles.Meridian
Stars that never rise nor set but are always visible.Circumpolar star
Stars that are never visible are located...Below your horizon
If you are exactly at the N or S pole, __ of the sky is visible.Exactly half
How much time is there between when a star rises & when it sets?Depends on the star
The extension of the Earth's equator out to the skyCelestial equator
The extension of the Earth's rotation axis to the skyCelestial poles
The set of constellations the sun appears to move through.The zodiac
It takes ____ for the sun to go through each constellation in the zodiac.1 month
Each day a constellation rises ___ in the day due to_____.Earlier. the direction of motion of the Earth in it's orbit.
The time it takes the Sun to return to the same point in the sky.Solar day
The time it takes a star to return to the same point in the sky.Sidereal day
A Sidereal day is exactly _____ shorter than a Solar day.4 minutes
The path through the stars that the apparent motion of the Sun traces out throughout the yr.The Ecliptic
Thirteen Zodiac constellations:Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpius, Ophiuchus, Sagittarius, Capriconus, Aquarius, Pisces.
The amount of time it takes the Earth to rotate exactly 360 degreesSidereal day
How many hours does it take the Earth to rotate 360 d. (Solar time)?Slightly less than 24 hours
Are the sun, major planets, and Earth's orbits in similar planes?Yes
The slow change in the direction that the Earth's rotation axis makes compared to the starsPrecession
Which location experiences the smallest amount of change in sunlight over the yr?The equator
TorF. Only 1 side of the moon is visible at all times.True
Which phase of the moon occurs when the moon is on the same side of the Earth as the Sun?New Moon
Which phase of the moon occurs when the moon is on the opposite side of the Earth from the Sun?Full Moon
The length of time between a repeat of a moon phase.Synodic period
The synodic period of the Moon is ___.29.5 days
The synodic period of the moon is the time required for the moon to ___.return to the same phase once.
The ____ & ____ periods of the Moon are equal which is why we always see the same side of the moon.orbital, rotational
The synodic period of the Moon is longer than the orbital period because ________.The Earth orbits the Sun counter-clockwise and the Moon orbits the Earth counter-clockwise
If the moon is in last quarter (third quarter) it rises and sets at ____ & ____.midnight, noon
The Moon is between the Earth & the Sun, so the Sun is in the Moons shadow.Solar eclipse
The Earth is between the Moon and the Sun, so the Sun is in the Earths shadow.Lunar eclipse
What 2 planets lie closer to the sun than the Earth?Mercury, Venus
Inner planets (2): Mercury. Venus
"Normal" motion from West to East as seen against the background of stars.Prograde
Motion from East to West compared to the background of starsRetrograde
Retrograde motion is caused by the ______ of the Outer planets by the Earthpassing
Where would you look to see a planet rise when it is in retrograde motion?Near the Western horizon
A planet will, over the course of one night, appear to move ____ to ____.East, West
Approximately the plane of the orbits of the planetThe ecliptic