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Why did early civilizations observe constellations?


A) only for religious reasons
B) for practical reasons, such as navigation and helping to determine seasons
C) only for recreational reasons
D) only to predict a person's destiny

E) A) and B)
F) B) and C)

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Only at the equator are all the stars visible over the course of the year.

A) True
B) False

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The place the Sun stops its northward motion along the ecliptic is the:


A) equator.
B) prime meridian.
C) summer solstice.
D) vernal equinox.
E) node of the ecliptic.

F) D) and E)
G) B) and E)

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A star with a large parallax:


A) is at a great distance from Earth.
B) is moving at a great speed with respect to Earth.
C) is at a short distance from Earth.
D) is moving at a slow speed with respect to Earth.
E) is not moving with respect to Earth.

F) A) and D)
G) B) and C)

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A solar eclipse can only happen during a:


A) new moon.
B) solstice.
C) first quarter moon.
D) full moon.
E) perihelion passage of the Sun.

F) B) and E)
G) B) and C)

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The parallax shift of a star would be greater if viewed from Mars than from Earth.

A) True
B) False

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The distances to bodies in the solar system are a few light minutes to light hours.

A) True
B) False

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The distances to other stars is best measured in ________.

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The celestial sphere appears to move fastest above the ________.

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That Polaris will not always be the pole star is due to:


A) the sidereal day being shorter than the solar day.
B) precession shifting the celestial pole.
C) the Moon following the ecliptic, instead of the equator.
D) the Earth's revolution being slightly less than exactly 365.25 days.
E) the Solar winds blowing the Earth farther away from the Sun.

F) A) and B)
G) B) and E)

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At apogee,the Moon is at its farthest from Earth and thus appears smaller than normal.Because of this it can produce only annular solar eclipses,but not total solar eclipses.

A) True
B) False

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Why are some solar eclipses total,and others annular?

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The Moon's orbit is not a perfect circle...

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Driving eastward just before sunrise,if you observe the Moon in the eastern sky,its phase must be:


A) full moon.
B) first quarter.
C) waxing Gibbous.
D) waning Crescent.
E) new moon.

F) A) and B)
G) A) and E)

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Describe how Erastothenes measured the circumference of our planet.

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Using the fact that the noon solstice Su...

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