A) The altitude of the NCP is the same as your latitude.
B) The altitude of the NCP is your angular distance from the North Pole.
C) The azimuth of the NCP is the same as your latitude.
D) The azimuth of the NCP is the angular distance from the North Pole.
E) The altitude of the NCP is the same as your distance from the North Pole.
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A) fewer than a thousand
B) a few thousand
C) about ten thousand
D) about a hundred thousand
E) more than you could count in your lifetime
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A) a half-circle extending from your horizon due east,through your zenith,to your horizon due west
B) a half-circle extending from your horizon due east,through the north celestial pole,to your horizon due west
C) a half-circle extending from your horizon due north,through your zenith,to your horizon due south
D) the point directly over your head
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A) because the other face points toward us only at new Moon,when we can't see the Moon
B) because the Moon does not rotate
C) because the Moon's rotational and orbital periods are equal
D) because the Sun illuminates only one half at a time
E) because the Moon has a nearly circular orbit around Earth
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During a solar eclipse,you wou...View Answer
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A) You can demonstrate parallax simply by holding up a finger and looking at it alternately from your left and right eyes.
B) The existence of stellar parallax is direct proof that Earth orbits the Sun.
C) Measurement of stellar parallax allows us to determine distances to nearby stars.
D) The technique of stellar parallax was used by Hubble to determine that the Andromeda Galaxy (M 31) is about 2 million light-years away.
E) Ancient astronomers were unable to measure parallax and used the absence of observed parallax as an argument in favor of an Earth-centered universe.
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A) the Moon does not rotate.
B) sunlight always hits the same face of the Moon.
C) the Moon rotates once in the same amount of time that it takes Earth to orbit the Sun once.
D) the Moon rotates once in the same amount of time that it takes the Moon to orbit Earth once.
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A) the patchy band of light that outlines the plane of the Milky Way Galaxy as seen from Earth
B) the whitish patch of light we see when we look toward the center of the Milky Way Galaxy
C) the spiral-shaped galaxy in which we live
D) the bright stars of the constellations that lie along the ecliptic in our sky
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A) a full Moon high in the sky
B) a first quarter Moon
C) a waning gibbous Moon
D) a third quarter Moon
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A) The angular distance between those two houses in the distance is 30 degrees.
B) The angular distance between those two bright stars in the sky is about 2 meters.
C) The angular size of the Sun is about the same as that of the Moon.
D) You can use your outstretched hand against the sky to estimate angular sizes and angular distances.
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A) Summers and winters would be more severe (for example,hotter and colder,respectively) than they are now.
B) The region of Earth where the Sun does not rise on the winter solstice would be larger (extending farther south) than it is now.
C) The length of each season (for example,the number of days from the summer solstice to the fall equinox) would be significantly longer than it is now.
D) Polaris would not be our North star.
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A) When we look in the sky,the stars all appear to be located on the celestial sphere.
B) Earth is placed at the center of the celestial sphere.
C) The celestial sphere does not exist physically.
D) The "celestial sphere" is just another name for our universe.
E) From any location on Earth,we can see only half the celestial sphere at any one time.
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A) We could not see it at all.
B) It would look about the same,but would be in the constellation Sagittarius instead of Andromeda.
C) It would be much brighter,because it would be illuminated by the many stars in the center of our galaxy.
D) It would look about the same,but it would be harder to pick out because its cloud-like appearance would make it blend in with the cloud-like appearance of the Milky Way in our sky.
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A) A constellation is a region in the sky as seen from Earth.
B) A constellation is a group of stars related through an ancient story.
C) A constellation is any random grouping of stars in the sky.
D) A constellation is a group of stars that are all located in about the same place in space.
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A) The nodes of the Moon's orbit precess with an 18-year period.
B) The orbital plane of the Moon is tilted slightly (by about 5 degrees) to the ecliptic plane.
C) The Moon is only about 1/4 as large as Earth in diameter.
D) The Moon goes through a complete cycle of phases about every 29 1/2 days.
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A) there is a lunar eclipse every 6 months
B) there is a solar eclipse every 6 months
C) the eclipse seasons occur less than 6 months apart
D) the vernal equinox will be in Aquarius in a few hundred years
E) there are never two solar eclipses in the same year
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A) a few dozen
B) a couple thousand
C) several million
D) a few hundred billion
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