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Quiz 1
1.
When must quizzes be completed?
1. By 9:00 am on Tuesdays
2. Never, the quizzes are optional
3. Near equinox
4. Near solstice
5. Only before 0 BC
1.
When must quizzes be completed?
1. By 9:00 am on Tuesdays
2. Never, the quizzes are optional
3. Near equinox
4. Near solstice
5. Only before 0 BC
2.
• Do you need to take the lab (ASTR 112) associated with
this lecture course (ASTR 111)
1. For most majors the answer is yes. If you are unsure,
you should see your academic adviser!
2. The lab is optional for all majors
3. Only astronomy majors need to take the lab
4. Only non-astronomy majors need to take the lab
2.
• Do you need to take the lab (ASTR 112) associated with
this lecture course (ASTR 111)
1. For most majors the answer is yes. If you are
unsure, you should see your academic adviser!
2. The lab is optional for all majors
3. Only astronomy majors need to take the lab
4. Only non-astronomy majors need to take the lab
3.
• What is the policy on make-up exams
1. Make-up exams are not given.
2. Make-up exams are given if the student notifies the
instructor one week in advance
3. Make-up exams are given at the end of the semester
4. Make-up exams are given when a break-up was
involved.
3.
• What is the policy on make-up exams
1. Make-up exams are not given.
2. Make-up exams are given if the student notifies the
instructor one week in advance
3. Make-up exams are given at the end of the semester
4. Make-up exams are given when a break-up was
involved.
4.
• Not graded
5.
• Where is your zenith?
1. Pointing directly up
2. Pointing directly down
3. Pointing towards the sun
4. Pointing towards the horizon
5. Pointing towards the ground
5.
• Where is your zenith?
1. Pointing directly up
2. Pointing directly down
3. Pointing towards the sun
4. Pointing towards the horizon
5. Pointing towards the ground
To find the zenith for a point
on the surface of the earth in
a drawing, draw a line
perpendicular to the surface
and extend it out into space.
Or, draw a line from the
center of Earth through the
point on the surface and
then extend it out into space.
Related Questions
A
B
C
D
In the figure, the sun is to the right and an observer is
standing on Earth at the position indicated by the light blue
dot. Which arrow points along the observer’s zenith?
6.
• What is another way of saying "the moon subtends 0.5 degrees in
the sky"
1. The extent of the moon in the sky is about 30 arcminutes.
2. The moon is big
3. The moon takes about 60 arcseconds to rise.
4. The extent of the moon in the sky is about 30 arcseconds.
5. The moon takes about 60 arcminutes to rise.
6.
• What is another way of saying "the moon subtends 0.5
degrees in the sky"
1. The extent of the moon in the sky is about 30
arcminutes.
0.5 degrees 60 arc - minutes
2. The moon is big
1
x
1 degree
 30 arc  minutes
3. The moon takes about 60 arcseconds to rise.
4. The extent of the moon in the sky is about 30
arcseconds.
5. The moon takes about 60 arcminutes to rise.
Related Questions
• From sunrise to sunset, how many
degrees does the sun subtend?
• If the moon subtends ½ of a degree in the
sky, how much does the sun subtend?
7.
• In the following image, what is the angle
subtended by the moon at apogee in degrees?
http://antwrp.gsfc.nasa.gov/apod/ap071025.html
• 1. 0.498 degrees
2. 69.17 degrees
3. 0.0083 degrees
4. 29.87 degrees
5. 33.89 degrees
7.
• In the following image, what is the angle
subtended by the moon at apogee in degrees?
http://antwrp.gsfc.nasa.gov/apod/ap071025.html
1. 0.498 degrees
2. 69.17 degrees
3. 0.0083 degrees
4. 29.87 degrees
5. 33.89 degrees
29.87 arc - minutes
1 degree
x
 0.498 degrees
1
60 arc - minutes
8.
• In class I noted that if the sun was the size of a
bowling ball, then Earth would be the size of a
very, very small pea. In your own words, make
up a memorable analogy that will help you
remember the relative size of Earth to the sun.
That is, say something like "If the GMU campus
were the size of the sun, then ..." or "If the sun
was the size of my brother's head, then ..."
Note that the diameter of the sun is about 100
times that of Earth.
8.
• In class I noted that if the sun was the size of a
bowling ball, then Earth would be the size of a
very, very small pea. In your own words, make
up a memorable analogy that will help you
remember the relative size of Earth to the sun.
That is, say something like "If the GMU campus
were the size of the sun, then ..." or "If the sun
was the size of my brother's head, then ..."
Note that the diameter of the sun is about 100
times that of Earth.
9.
• How many arcseconds are in 60 arcminutes?
1. 1 arcsecond
2. 60 arcseconds
3. 0.0002777 arcseconds
4. 3600 arcseconds
5. 45 arcminutes
10.
• An arcsecond is a measure of
1. angle.
2. the time between successive orbital positions.
3. length along a circle
4. the time between oscillations of a standard
clock.
11.
• One astronomical unit is defined as the
1. distance from which Earth-Sun distance will subtend
an angle of one arcsecond.
2. mean distance between the Sun and the Earth.
3. distance traveled by light in one parsec
4. distance traveled by one astronaut at the speed of
light.
5. distance traveled by light in one year.
12.
• In class, we measured the angular separation
between two dots on the screen. Would your
measurement of the angular separation change
if you moved from the front row to the back row?
1. Yes
2. No
12.
• In class, we measured the angular separation
between two dots on the screen. Would your
measurement of the angular separation change
if you moved from the front row to the back row?
1. Yes
2. No
13.
• About how far would you need to travel in a spaceship
(starting on Earth) before you found that the angular
separation between the Earth and sun was about 1
arcsecond? Choose the closest answer.
1. 1 light-year
2. Neptune
3. 1 AU
4. 3600 parsec
5. Jupiter
13.
• About how far would you need to travel in a spaceship
(starting on Earth) before you found that the angular
separation between the Earth and sun was about 1
arcsecond? Choose the closest answer.
1. 1 light-year (actually, 3.26 light-years, which is a
parsec)
2. Neptune
3. 1 AU
4. 3600 parsec
5. Jupiter
14.
• If you traveled at one-half of the speed of light for one
year, how far would you have gone?
1. One-half of a light-year
2. 1 parsec
3. 3.26 parsecs
4. To the outer edge of the solar system
5. One light year
14.
• If you traveled at one-half of the speed of light for one
year, how far would you have gone?
1. One-half of a light-year
2. 1 parsec
3. 3.26 parsecs
4. To the outer edge of the solar system
5. One light year
15.
•
Which of the following best describes parallax?
1. The plane that the sun orbits the sun in.
2. A change in the apparent color of an object because
of a change in position of the observer or observing
point.
3. A change in the apparent brightness of an object
because of a change in position of the observer or
observing point.
4. A change in the apparent position of an object
because of a change in position of the observer or
observing point.
16.
• From January to July, the position of star A,
when viewed from an observer on Earth,
appeared to move a certain amount with
respect to the distant stars. In class we
used the diagram below to determine how
the observer's view would change
throughout the year.
Suppose Earth's orbital distance shrunk to
0.5 AU. Would star A move more or less
with respect to the distant stars throughout
the year?
1. Less
2. More
16.
• From January to July, the position of star A,
when viewed from an observer on Earth,
appeared to move a certain amount with
respect to the distant stars. In class we
used the diagram below to determine how
the observer's view would change
throughout the year.
Suppose Earth's orbital distance shrunk to
0.5 AU. Would star A move more or less
with respect to the distant stars throughout
the year?
1. Less
2. More
Related Questions
• The position of an observer on Earth
changes relative to the position of star A
from sunrise to sunset. Would this also
cause the position of star A to appear to
move relative to the distant stars? If so,
more or less than that caused by the
change in position of an observer caused
by the orbit of Earth?