Quiz 3

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Quiz 3
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1.

• Not graded.

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2.

• In the following image, where would you need to
  be in order to see the sun at your zenith during
  the day?
• 1. Anywhere along the
• Tropic of Cancer2. Anywhere along the
• equator3. At the south pole4. At the north
  pole5. Anywhere along the
• Tropic of Capricorn

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2.

• In the following image, where would you need to
  be in order to see the sun at your zenith during
  the day?
• 1. Anywhere along the
• Tropic of Cancer2. Anywhere along the
• equator3. At the south pole4. At the north
  pole5. Anywhere along the
• Tropic of Capricorn

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To find an observers zenith, draw a line
perpendicular to Earths surface and extend it
out into space. (Or, draw a line from the center
of Earth, through the observer, and then extend
the line out into space.)
The observer indicated with a yellow dot is at a
latitude that corresponds to the Tropic of
Capricorn, and his local time is noon. If he
points along his zenith, he will point directly
at the sun.
Zenith
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Related Questions

• On the day indicated in the previous image, would
  a person who was on the Arctic Circle ever say
  that the sun is at his zenith?
• On the day indicated in the previous image, would
  a person who was on the Equator ever say that the
  sun is at his zenith?
• What is the month corresponding to the previous
  image?

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3.

• If you were standing at a location along the
  Tropic of Cancer at noon on December 21st, how
  would you describe the position of the sun in the
  sky? Note that the image used in the previous
  problem is for December 21st.1. Towards the
  south2. Towards the north3. Exactly at my
  zenith

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3.

• If you were standing at a location along the
  Tropic of Cancer at noon on December 21st, how
  would you describe the position of the sun in the
  sky? Note that the image used in the previous
  problem is for December 21st.1. Towards the
  south2. Towards the north3. Exactly at my
  zenith

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The white line is the zenith for a person on the
Tropic of Cancer at a local time of noon. If the
observer was looking along his zenith, he would
need to look southward in the sky to see the sun.
Zenith
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Related Questions

• Two months after the date corresponding to the
  previous image and at noon, in what direction
  would a person on the Tropic of Capricorn say the
  sun is? North? South?

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4.

• If you live in the Arctic Circle, on June 21st,
  the sun will never set. On that day, will the sun
  reach your zenith at noon?
• 1. No, because the sun's rays still strike
  Earth's surface at an angle2. Yes, just
  because.

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4.

• If you live in the Arctic Circle, on June 21st,
  the sun will never set. On that day, will the sun
  reach your zenith at noon?
• 1. No, because the sun's rays still strike
  Earth's surface at an angle2. Yes, just
  because.

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(No Transcript)
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Zenith for two observers, one on and one in the
Arctic Circle. In both cases, the zenith does
not point directly at the sun.
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Related Questions

• Which observer on the previous image would see
  the sun higher in the sky at noon?

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5.

• From the perspective of someone on Earth what
  position of A-E best fits the Moon view in the
  lower-left-hand corner? Note that in this image
  the sun is to the right.
• 1. C2. B3. A4. E5. D

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5.

• From the perspective of someone on Earth what
  position of A-E best fits the Moon view in the
  lower-left-hand corner? Note that in this image
  the sun is to the right.
• 1. C2. B3. A4. E5. D

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At I, a person on Earth says that the left side
of the moon is sunlit. At F, a person on Earth
says that no part of the moon is sunlit. Between
I and F, the part that is sunlit must have shrunk.
G
Suns rays
F
H
Earth
I
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6.

• Suppose that you live on the equator. At noon,
  will you ever see a full moon?1. Only at
  equinox2. Yes3. Only at solstice4. No

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6.

• Suppose that you live on the equator. At noon,
  will you ever see a full moon? 1. Only at
  equinox2. Yes3. Only at solstice4. No

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1st quarter moon.
Full moon
Yellow dot is observer.
View from above the north pole. Sun is to the
right. Sunlight falls on the white parts. 1st
quarter moon is first visible at noon. Full moon
is not visible at noon (cant draw line to it
without hitting Earth).
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7.

• From Earth, the entire side of the moon THAT WE
  CAN SEE is illuminated on the day of the full
  moon. How much of the moon's TOTAL surface is
  actually illuminated by the sun?1. 502.
  253. 1004. 75

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7.

• From Earth, the entire side of the moon THAT WE
  CAN SEE is illuminated on the day of the full
  moon. How much of the moon's TOTAL surface is
  actually illuminated by the sun?1. 502.
  253. 1004. 75

Half of the moons surface is (almost) always
illuminated by the sun. At new moon, we see the
half that is not illuminated. At full moon, we
see the half that is illuminated.
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Related Questions

• During a total solar eclipse, how much of the
  moons surface is illuminated by the sun?
• During a total lunar eclipse, how much of the
  moons surface is directly illuminated by the sun?

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8.

• A simple model of the Moon is that it orbits in
  Earth's ecliptic plane and that its orbit is a
  perfect circle. If this were true, which of the
  following would we expect?1. We would never
  see the third quarter moon.2. One eclipse per
  year.3. An eclipse every month.4. We would
  never see the first quarter moon.

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8.

• A simple model of the Moon is that it orbits in
  Earth's ecliptic plane and that its orbit is a
  perfect circle. If this were true, which of the
  following would we expect?1. We would never
  see the third quarter moon.2. One eclipse per
  year.3. An eclipse every month.4. We would
  never see the first quarter moon.

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9.

• What is the difference between an annular and
  total eclipse?1. During a total eclipse, the
  sun is not on the line of nodes.2. During an
  annular eclipse, the moon is closer to Earth.3.
  During a total eclipse, the moon is farther from
  Earth.4. During an annular eclipse, the full
  disk of the sun is not covered. During a total
  eclipse the full disk of the sun is covered and
  all we see is the faint corona. The moon is a bit
  further from Earth during an annular eclipse.

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9.

• What is the difference between an annular and
  total eclipse?1. During a total eclipse, the
  sun is not on the line of nodes.2. During an
  annular eclipse, the moon is closer to Earth.3.
  During a total eclipse, the moon is farther from
  Earth.4. During an annular eclipse, the full
  disk of the sun is not covered. During a total
  eclipse the full disk of the sun is covered and
  all we see is the faint corona. The moon is a bit
  further from Earth during an annular eclipse.

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Related Questions

• If the moon orbited the earth in a perfect
  circle, would the time between annular and total
  eclipses increase, decrease, or stay the same.

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10.

• Why don't we see a solar eclipse (either total or
  annular) every month?1. Because the same side
  of the moon always faces Earth.2. Because the
  moon does not move in a circular orbit.3.
  Because the moon casts an umbral and penumbral
  shadow.4. Because the moon moves in a circular
  orbit.5. Because Earth does not move in a
  circular orbit around the sun.6. Because the
  moon orbits Earth in a plane that is slightly
  tilted to the ecliptic plane.

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10.

• Why don't we see a solar eclipse (either total or
  annular) every month?1. Because the same side
  of the moon always faces Earth.2. Because the
  moon does not move in a circular orbit.3.
  Because the moon casts an umbral and penumbral
  shadow.4. Because the moon moves in a circular
  orbit.5. Because Earth does not move in a
  circular orbit around the sun.6. Because the
  moon orbits Earth in a plane that is slightly
  tilted to the ecliptic plane.

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11.

• Are the moon's phases caused by Earth casting a
  shadow on the moon?1. No. This is a common
  misconception.2. Yes

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Related Questions

• Does the Earth ever cast a shadow on the moon?

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12.

• On the day that someone on Earth says it is a
  full moon, what will a person on the moon say
  when they look at Earth?1. About one-quarter
  of the part of Earth that I can see is
  sunlit.2. About three-quarters of the part of
  Earth that I can see is sunlit.3. About half of
  the part of Earth that I can see is sunlit.4.
  Almost all of the part of Earth that I see is
  dark.5. Almost all of the part of Earth that I
  can see is sunlit.

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12.

• On the day that someone on Earth says it is a
  full moon, what will a person on the moon say
  when they look at Earth?1. About one-quarter
  of the part of Earth that I can see is
  sunlit.2. About three-quarters of the part of
  Earth that I can see is sunlit.3. About half of
  the part of Earth that I can see is sunlit.4.
  Almost all of the part of Earth that I see is
  dark.5. Almost all of the part of Earth that I
  can see is sunlit.

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Full moon. Sun is far to the right.
Yellow dot is observer.
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Related Questions

• The following is a typical sketch that we use to
  show such things as when someone will first be
  able to see the full moon. Why is the right half
  of the moon illuminated even though as drawn all
  of the Suns rays would be blocked by Earth?

Full moon. Sun is far to the right.
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13.

• From the perspective of someone on Earth, the
  moon exhibits synchronous rotation. This means
  that the same face of the moon is always facing
  Earth.From the perspective of the sun, will the
  same face of the moon always face the sun? That
  is, will someone on the sun always see the same
  side of the moon?1. No
• 2. Yes

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13.

• From the perspective of someone on Earth, the
  moon exhibits synchronous rotation. This means
  that the same face of the moon is always facing
  Earth.From the perspective of the sun, will the
  same face of the moon always face the sun? That
  is, will someone on the sun always see the same
  side of the moon?1. No
• 2. Yes

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• At A, a person on the sun cannot see the red
  spot on the moon. At D, they can see the red
  spot.

B
A
D
C
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Related Questions

• At D, wouldnt the Earth be blocking the moon
  from view of the sun?
• How often would a person on the red dot on the
  moon say that the sun is at his zenith?

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14.

• How often does a person on the equator see a full
  moon?
• 1. At new moon2. Once per month3. Never4. The
  Moon is always full5. Twice per month

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14.

• How often does a person on the equator see a full
  moon?
• 1. At new moon2. Once per month3. Never4. The
  Moon is always full5. Twice per month

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Related Questions

• If you lived on the Tropic of Capricorn, would
  your answer to the previous question change?