Question 1

The celestial equator always passes directly overhead.

Accepted Answer

A) True 
 B)False

Question 2

Less formally defined groupings of stars are called __________________.

Accepted Answer

The answer of Less formally defined groupings of stars are...

Question 3

Which of the following statements correctly describes the relationship between stars and constellations?

Accepted Answer

A)   Only stars close to the ecliptic (the Earth's orbital plane)  are located in constellations.
B)   Every star is located in a constellation.
C)   Only the brighter stars are in constellations.
D)   Only those stars that were visible to the ancient Greeks are located in constellations.

Question 4

An observer on Earth's equator would find _______

Accepted Answer

A)   the celestial equator passing at 45 degrees above the northern horizon.
B)   the celestial equator passing at 45 degrees above the southern horizon.
C)   that the celestial equator coincides with the horizon.
D)   the celestial equator passing directly overhead.
E)   None of the other choices are true.

Question 5

In 21,200 years from now, Thuban will once again be our north celestial pole.

Accepted Answer

A) True 
 B)False

Question 6

Describe the location of Polaris in the sky relative to the horizon as seen by observers in Alaska (lat. = 60° N), Texas (lat. = 33° N), Ecuador (lat. = 0°), and Australia (lat. = 30° S).

Accepted Answer

The further away from the north pole you...

Question 7

How much of the Earth's surface is experiencing night at any time?

Accepted Answer

A)   less than one-half, because of the tilt of the equator to the ecliptic plane
B)   more than one-half, because of the precession of the poles
C)   exactly one-half
D)   all of the night sky

Question 8

An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?

Accepted Answer

A)   straight north
B)   straight east
C)   straight south
D)   straight west
E)   straight up, directly overhead

Question 9

Which can be seen by the naked eye?

Accepted Answer

A)   m v = +10
B)   m v = +18
C)   m v = +6
D)   m v = +8

Question 10

Seen from the northern latitudes (mid-northern hemisphere) , the star Polaris

Accepted Answer

A)   is never above the horizon during the day.
B)   always sets directly in the west.
C)   is always above the northern horizon.
D)   is never visible during the winter.
E)   is the brightest star in the sky.

Question 11

The subscript ______ stands for ________ to remind you that only information on visible light is given.

Accepted Answer

The answer of The subscript ______ stands for ________ to...

Question 12

At the Earth's north pole, the north celestial pole is directly overhead and stars near the horizon travel in straight lines

Accepted Answer

A)   straight up from the horizon.
B)   straight up from the horizon slanting toward the right.
C)   straight up from the horizon slanting toward the left.
D)   parallel to the horizon.

Question 13

Precession of the rotation axis of Earth takes ____ to complete a cycle.

Accepted Answer

A)   24 hours
B)   one year
C)   260 years
D)   26,000 years
E)   260,000 years

Question 14

____ is the brightest star in the constellation of Ursa Majoris.

Accepted Answer

A)   β Ursa Majoris
B)   γ Ursa Majoris
C)   α Ursa Majoris
D)   Wrong! Ursa Majoris is the name of the brightest star.

Question 15

The approximate intensity ratio between two stars is 100. Thus the apparent visual magnitude difference between the stars is ______________.

Accepted Answer

A)   1
B)   5
C)   10
D)   100

Question 16

What is the approximate latitude of the observer in the diagram below if they are located in the hemisphere containing the south celestial pole?
​ 
​

Accepted Answer

A)   20° N
B)   20° S
C)   70° N
D)   70° S
E)   0°

Question 17

Describe the path that a star on the celestial equator follows from the time it rises until it sets for a person at a latitude of 60° N and a person at the equator.

Accepted Answer

A star on the celestial equato...

Question 18

In the picture shown, the lines are called __________________.

Accepted Answer

The answer of  
In the picture shown, the lines...

Question 19

The light from Polaris is 24.2 times less intense than the light received from Sirius. Which star is the truly brighter star, that is, emitting more visual light at its surface?

Accepted Answer

A)   Polaris
B)   Sirius
C)   Neither, they emit the same amount at their surfaces.
D)   This cannot be determined based upon the information given.

Question 20

An observer's nadir is

Accepted Answer

A)   the point directly opposite the observer's zenith.
B)   the north point on the observer's horizon.
C)   located at the center of Earth.
D)   always located near a circumpolar constellation.
E)   directly opposite the north celestial pole.

Exam 2: A Users Guide to the Sky

The light from Polaris is 24.2 times less intense than the light received from Sirius. Which star is the truly brighter star, that is, emitting more visual light at its surface?

Correct AnswerverifiedShow Answer

Seen from the northern latitudes (mid-northern hemisphere) , the star Polaris

Correct AnswerverifiedShow Answer

The approximate intensity ratio between two stars is 100. Thus the apparent visual magnitude difference between the stars is ______________.

Correct AnswerverifiedShow Answer

Precession of the rotation axis of Earth takes ____ to complete a cycle.

Correct AnswerverifiedShow Answer

The celestial equator always passes directly overhead.

Correct AnswerverifiedShow Answer

Which of the following statements correctly describes the relationship between stars and constellations?

Correct AnswerverifiedShow Answer

Describe the path that a star on the celestial equator follows from the time it rises until it sets for a person at a latitude of 60° N and a person at the equator.

Correct AnswerverifiedA star on the celestial equato...View AnswerShow Answer

An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?

Correct AnswerverifiedShow Answer

In 21,200 years from now, Thuban will once again be our north celestial pole.

Correct AnswerverifiedShow Answer

Describe the location of Polaris in the sky relative to the horizon as seen by observers in Alaska (lat. = 60° N), Texas (lat. = 33° N), Ecuador (lat. = 0°), and Australia (lat. = 30° S).

Correct AnswerverifiedThe further away from the north pole you...View AnswerShow Answer

At the Earth's north pole, the north celestial pole is directly overhead and stars near the horizon travel in straight lines

Correct AnswerverifiedShow Answer

In the picture shown, the lines are called __________________.

Correct AnswerverifiedShow Answer

An observer on Earth's equator would find _______

Correct AnswerverifiedShow Answer

How much of the Earth's surface is experiencing night at any time?

Correct AnswerverifiedShow Answer

What is the approximate latitude of the observer in the diagram below if they are located in the hemisphere containing the south celestial pole? ​ ​

Correct AnswerverifiedShow Answer

The subscript ______ stands for ________ to remind you that only information on visible light is given.

Correct AnswerverifiedShow Answer

Less formally defined groupings of stars are called __________________.

Correct AnswerverifiedShow Answer

An observer's nadir is

Correct AnswerverifiedShow Answer

____ is the brightest star in the constellation of Ursa Majoris.

Correct AnswerverifiedShow Answer

Which can be seen by the naked eye?

Correct AnswerverifiedShow Answer

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A star on the celestial equato...
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The further away from the north pole you...
View Answer

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What is the approximate latitude of the observer in the diagram below if they are located in the hemisphere containing the south celestial pole?

Correct Answer
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The subscript stands for __ to remind you that only information on visible light is given.

Correct Answer
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