Exam 2: A Users Guide to the Sky

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From which language did the majority of star names originate?

(Multiple Choice)
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Match the astronomical term to its definition.
a scientific model of the sky
ecliptic
the measure of light energy striking one square meter per second
angular diameter
the angle between two lines extending from your eye to two objects in the sky
nadir
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a scientific model of the sky
ecliptic
the measure of light energy striking one square meter per second
angular diameter
the angle between two lines extending from your eye to two objects in the sky
nadir
provides a measurement range for the brightness of stars
magnitude scale
the angular distance across an object, from one edge to another
zenith
named group of stars with finite boundaries in the sky
asterism
the point of the celestial sphere directly under your feet
celestial sphere
the apparent path of the Sun against the background of stars
constellation
a less formally defined grouping of stars
angular distance
the point of the celestial sphere directly above your head
flux
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  The Sky Around You - Page 18 (For the following questions) Review the accompanying figure and identify point A. The Sky Around You - Page 18 (For the following questions) Review the accompanying figure and identify point A.

(Multiple Choice)
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  The Sky Around You - Page 18 (For the following questions) Review the accompanying figure. Where does the celestial equator always meet the horizon? The Sky Around You - Page 18 (For the following questions) Review the accompanying figure. Where does the celestial equator always meet the horizon?

(Multiple Choice)
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Within the Northern Hemisphere, the vernal equinox marks the start of ____.

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The nadir marks the point of the celestial sphere directly above your head.

(True/False)
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The constellations are an ancient heritage handed down for thousands of years as ways to tell stories of mythical heroes and monsters.

(True/False)
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What is an asterism?

(Multiple Choice)
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If two stars have a magnitude difference of 5, what is their flux ratio?

(Multiple Choice)
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What is the Milankovitch hypothesis and what evidence is there to support this hypothesis?

(Essay)
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What is the cause for the slow movement of reference marks, such as the celestial poles and equator, to move across the sky?

(Multiple Choice)
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The ecliptic is often called the _______________ of Earth's orbit on the sky.

(Short Answer)
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The seasons are caused by Earth's orbit moving closer to or farther from the Sun.

(True/False)
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What did the IAU establish in 1928?

(Multiple Choice)
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On the day of the _______________ in late June, Earth's Northern Hemisphere is inclined toward  the Sun.

(Short Answer)
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Explain why we have seasons and compare/contrast the cycle of seasons for both hemispheres.

(Essay)
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Earth's rapid rotation makes its axis sweep out the shape of a cone, like a heavy top slowing down.  This motion is known as ____.

(Multiple Choice)
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What is the apparent path of the Sun against the background of stars?

(Multiple Choice)
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The sky appears to rotate eastward around Earth each day, but that is a consequence of the westward rotation of Earth.

(True/False)
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Flux is a measure of the light energy from a star that hits a collecting area of one square meter in one second.

(True/False)
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