Question 1

Choose the appropriate star from Table S1.1 for the following questions:
Table S1.1
 
-Which star lies closest to the south celestial pole on the celestial sphere?

Accepted Answer

The answer of Choose the appropriate star from Table S1.1...

Question 2

Suppose the date is March 21 and the Sun passes through your zenith at noon.Where are you?

Accepted Answer

A)  the equator
B)  the Tropic of Cancer
C)  the Tropic of Capricorn
D)  the Arctic Circle
E)  the Antarctic CircleF) B) and E)
G) A) and B)

Question 3

Process of Science: Devise an observation to be made from Earth that gives evidence that our orbit is not perfectly circular.

Accepted Answer

Measure the angular size of the Sun and ...

Question 4

Which of the following best describes the meaning of declination and right ascension?

Accepted Answer

A)  They are coordinates on the celestial sphere that are very similar to the coordinates of altitude and direction on Earth.
B)  They are used to describe the locations and distances of stars that we see in the night sky.
C)  They are coordinates on the celestial sphere,with declination telling us the angular distance of an object from the celestial equator and right ascension telling us how far around the celestial sphere an object is located from the vernal equinox.
D)  They are terms used by astronomers to describe how the sky changes with the seasons.E) B) and C)
F) All of the above

Question 5

On the equator,days and nights are always 12 hours long,no matter what time of year.

Accepted Answer

A) True 
 B)False

Question 6

No matter where you live on Earth,the Sun is always directly overhead at noon.

Accepted Answer

A) True 
 B)False

Question 7

The celestial coordinates of the Sun change from day to day.

Accepted Answer

A) True 
 B)False

Question 8

For vacation,you decide to take a solo boat trip.While contemplating the universe,you lose track of your location.Fortunately,you have some astronomical tables and instruments,as well as a UT clock.You thereby put together the following description of your situation:
∙ It is the day of the spring equinox.
∙ The Sun is on your meridian at an altitude of 75° in the south.
∙ The UT clock reads 22:00.
a.What is your latitude? How do you know?
b.What is your longitude? How do you know?

Accepted Answer

a.Your latitude is 15°N.Because it is th...

Question 9

Process of Science: Devise an observation involving stars that would provide evidence (not necessarily proof)that Earth is round.Any observation that can be made from Earth is acceptable.

Accepted Answer

Observe the North Star (or,for that matt...

Question 10

Choose the appropriate star from Table S1.1 for the following questions:
Table S1.1
 
-Which star lies closest to the north celestial pole on the celestial sphere?

Accepted Answer

The answer of Choose the appropriate star from Table S1.1...

Question 11

For the following questions,refer to Figure S1.2,which shows a portion of the sky visible in the early evenings in winter.Note that five bright stars are labeled with lowercase letters and five constellations are labeled with capitals.A few hints are also given.
 
-Which constellation (capital letters)is Canis Major?

Accepted Answer

The answer of For the following questions,refer to Figure S1.2,which...

Question 12

Choose the appropriate star from Table S1.2 for the following questions:
Table S1.2
 
-Which star passes nearest the zenith at latitude 40°N?

Accepted Answer

The answer of Choose the appropriate star from Table S1.2...

Question 13

No matter where you live on Earth,the Sun always rises and sets each day.

Accepted Answer

A) True 
 B)False

Question 14

All the following statements are true.Which one explains why mean solar time differs from apparent solar time?

Accepted Answer

A)  The length of a solar day is not always exactly 24 hours.
B)  Earth's rotation period is actually about 23 hours 56 minutes,not 24 hours.
C)  Earth's axis precesses with a period of 26,000 years.
D)  The Sun reaches the meridian at different times at different longitudes within the same time zone.
E)  The path of the Sun through the sky depends on both latitude and date.F) A) and C)
G) B) and E)

Question 15

Which of the following statements about sidereal and solar days is not true?

Accepted Answer

A)  A sidereal day is the definition of a day on the Earth and a solar day is the definition of a day on the Sun.
B)  A solar day is approximately 4 minutes longer than a sidereal day.
C)  A solar day is the amount of time between successive appearances of the Sun on our meridian.
D)  A sidereal day is the amount of time between successive appearances of any star on our meridian.E) C) and D)
F) All of the above

Question 16

Suppose you lived at Earth's equator.Which of the following statements would not be true?

Accepted Answer

A)  The north celestial pole is directly on your horizon,due north (with Polaris quite nearby) .
B)  The south celestial pole is directly on your horizon,due south.
C)  Every day of the year,the Sun is above your horizon for 12 hours and below it for 12 hours.
D)  The celestial equator goes through your sky from due east on your horizon,through 50° altitude in the south,to due west on the horizon.
E)  No stars are circumpolar.F) A) and D)
G) None of the above

Question 17

For vacation,you decide to take a solo boat trip.While contemplating the universe,you lose track of your location.Fortunately,you have some astronomical tables and instruments,as well as a UT clock.You thereby put together the following description of your situation:
∙ It is the day of the summer solstice.
∙ The Sun is on your meridian at an altitude of 67.5° in the north.
∙ The UT clock reads 06:00.
a.What is your latitude? How do you know?
b.What is your longitude? How do you know?

Accepted Answer

a.You are on the equator.Because it is t...

Question 18

If both the Sun and a distant star cross your meridian at exactly 12:00 noon today,at what time will the star cross your meridian tomorrow?

Accepted Answer

Tomorrow t...

Question 19

Based on our current Gregorian calendar,which of the following years is not a leap year?

Accepted Answer

A)  2000
B)  2004
C)  2008
D)  2012
E)  All of the above are leap years.F) B) and C)
G) A) and E)

Question 20

Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?

Accepted Answer

A)  Determining longitude requires mathematical techniques that were not known at the time.
B)  Determining longitude requires much more precise measurements of angles in the sky than does latitude.
C)  Determining longitude requires accurate tables of the celestial coordinates of stars,while determining latitude does not.
D)  Determining longitude requires an accurate clock,but latitude does not.E) A) and B)
F) B) and C)

Exam 25: Celestial Timekeeping and Navigation

No matter where you live on Earth,the Sun always rises and sets each day.

Correct Answer
verified

Based on our current Gregorian calendar,which of the following years is not a leap year?

Correct Answer
verified

No matter where you live on Earth,the Sun is always directly overhead at noon.

Correct Answer
verified

Correct Answer
verified
a.Your latitude is 15°N.Because it is th...
View Answer

Choose the appropriate star from Table S1.2 for the following questions: Table S1.2 -Which star passes nearest the zenith at latitude 40°N?

Correct Answer
verified

If both the Sun and a distant star cross your meridian at exactly 12:00 noon today,at what time will the star cross your meridian tomorrow?

Correct Answer
verified
Tomorrow t...
View Answer

All the following statements are true.Which one explains why mean solar time differs from apparent solar time?

Correct Answer
verified

Which of the following best describes the meaning of declination and right ascension?

Correct Answer
verified

Suppose the date is March 21 and the Sun passes through your zenith at noon.Where are you?

Correct Answer
verified

Process of Science: Devise an observation to be made from Earth that gives evidence that our orbit is not perfectly circular.

Correct Answer
verified
Measure the angular size of the Sun and ...
View Answer

Which of the following statements about sidereal and solar days is not true?

Correct Answer
verified

On the equator,days and nights are always 12 hours long,no matter what time of year.

Correct Answer
verified

Correct Answer
verified
a.You are on the equator.Because it is t...
View Answer

The celestial coordinates of the Sun change from day to day.

Correct Answer
verified

Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?

Correct Answer
verified

Correct Answer
verified

Suppose you lived at Earth's equator.Which of the following statements would not be true?

Correct Answer
verified

Choose the appropriate star from Table S1.1 for the following questions: Table S1.1 -Which star lies closest to the south celestial pole on the celestial sphere?

Correct Answer
verified

Process of Science: Devise an observation involving stars that would provide evidence (not necessarily proof)that Earth is round.Any observation that can be made from Earth is acceptable.

Correct Answer
verified
Observe the North Star (or,for that matt...
View Answer

Choose the appropriate star from Table S1.1 for the following questions: Table S1.1 -Which star lies closest to the north celestial pole on the celestial sphere?

Correct Answer
verified

Exam 25: Celestial Timekeeping and Navigation

No matter where you live on Earth,the Sun always rises and sets each day.

Correct AnswerverifiedShow Answer

Based on our current Gregorian calendar,which of the following years is not a leap year?

Correct AnswerverifiedShow Answer

No matter where you live on Earth,the Sun is always directly overhead at noon.

Correct AnswerverifiedShow Answer

Correct Answerverifieda.Your latitude is 15°N.Because it is th...View AnswerShow Answer

Choose the appropriate star from Table S1.2 for the following questions: Table S1.2 -Which star passes nearest the zenith at latitude 40°N?

Correct AnswerverifiedShow Answer

If both the Sun and a distant star cross your meridian at exactly 12:00 noon today,at what time will the star cross your meridian tomorrow?

Correct AnswerverifiedTomorrow t...View AnswerShow Answer

All the following statements are true.Which one explains why mean solar time differs from apparent solar time?

Correct AnswerverifiedShow Answer

Which of the following best describes the meaning of declination and right ascension?

Correct AnswerverifiedShow Answer

Suppose the date is March 21 and the Sun passes through your zenith at noon.Where are you?

Correct AnswerverifiedShow Answer

Process of Science: Devise an observation to be made from Earth that gives evidence that our orbit is not perfectly circular.

Correct AnswerverifiedMeasure the angular size of the Sun and ...View AnswerShow Answer

Which of the following statements about sidereal and solar days is not true?

Correct AnswerverifiedShow Answer

On the equator,days and nights are always 12 hours long,no matter what time of year.

Correct AnswerverifiedShow Answer

Correct Answerverifieda.You are on the equator.Because it is t...View AnswerShow Answer

The celestial coordinates of the Sun change from day to day.

Correct AnswerverifiedShow Answer

Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Suppose you lived at Earth's equator.Which of the following statements would not be true?

Correct AnswerverifiedShow Answer

Choose the appropriate star from Table S1.1 for the following questions: Table S1.1 -Which star lies closest to the south celestial pole on the celestial sphere?

Correct AnswerverifiedShow Answer

Process of Science: Devise an observation involving stars that would provide evidence (not necessarily proof)that Earth is round.Any observation that can be made from Earth is acceptable.

Correct AnswerverifiedObserve the North Star (or,for that matt...View AnswerShow Answer

Choose the appropriate star from Table S1.1 for the following questions: Table S1.1 -Which star lies closest to the north celestial pole on the celestial sphere?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a.Your latitude is 15°N.Because it is th...
View Answer

Correct Answer
verified

Correct Answer
verified
Tomorrow t...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Measure the angular size of the Sun and ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a.You are on the equator.Because it is t...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Observe the North Star (or,for that matt...
View Answer

Correct Answer
verified