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wrote...
Posts: 223
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9 years ago
If an observer in Paris, France observes the moon setting at 6
p.m., roughly what time will an observer in Edmonton see
the moon setting?

A. 12 a.m.
B. 6 a.m.
C. 12 p.m.
D. 6 p.m.
E. There is not enough information given!

The answer is 6 P.M. ,D but how do we get to that answer?
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wrote...
Staff Member
Educator
9 years ago
Not entirely sure how to answer this, but I found something on Yahoo Answers that might help.

Determine either the position in the sky (western horizon, west, meridian, east, eastern horizon), the time of day (sunrise, 9 am, noon, 3 pm, sunset, 9pm, midnight, 3 am), or the phase of the moon (waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, waning crescent, new) in the following situations:

a) moon is on the eastern horizon at sundown
b) 7 pm and the moon is in the east
c) meridian at dawn
d) rising at 3pm
e) Where in the sky is a first quarter at midnight?
f) Where in the sky is a waning crescent at sunrise?
g) Where in the sky is a waning gibbous at sunrise?
h) What time is it when the full moon is setting?
i) What time is it when the new moon is on the horizon?
j) What time is it when the first quarter moon is crossing the meridian below your horizon? [for you but visible on the other side of the world]
k) Can you see a full moon during the day? Why or why not?
l) If the moon is full and you were standing on the moon, what phase would the earth be?

The guy answers:

There is an easy way to answer all of these questions if you just stop and think for a bit about why the moon looks the way it does. We’ll start with the simplest phases: the full moon and the new moon. In these two phases the sun, moon and Earth are in a straight line.

It is also helpful to keep in mind that the moon, like the sun, always rises in the East and sets in the West. So, when the moon is full it is rising in the East as the sun is setting in the West. When the moon is new it is rising in the East along with the sun.

With this in mind, let us look at the situations:
(a) If the moon is on the Eastern horizon at sundown it is a full or nearly full moon.
(b) 7pm and the moon is in the East could also be a full moon. But this really depends on the time of year. Here in Texas in the summer the sun sets around 9 pm. So, if the moon is in the Eastern sky two hours before sunset it means the moon is going to be full in a day or so. Thus the moon is waxing so we have a waxing gibbous moon.
(h) When the full moon is setting the sun must be rising
(i) When the new moon is on the horizon it is either rising (Eastern horizon) or it is setting (Western horizon). When the moon is new it is not visible to us because it is too close to the sun.
(k) Since the full moon is rising when the sun is setting and setting when the sun is rising it is impossible to see a full moon during the daylight hours.

Now, let’s talk about the quarter moons. When we see a half moon (Sometimes a quarter moon is called a half moon because at all times half of the moon is lit by the sun, just as Earth is, but we see only half of that half, a half of a half is a quarter!) it is because the moon is perpendicular to a line drawn from the sun to Earth. The moon is in the first quarter phase when rises at noon and is highest in the sky at sunset and sets at midnight. When in first quarter the right side of the moon is lighted.

This means that a third quarter moon rises at midnight, highest in the sky at sunrise and sets at noon. The left side of the third quarter moon is lighted.

The first quarter moon is a waxing moon, it is getting larger and larger and it is rising longer and longer after sunrise until it rises so long after sunrise that the sun is setting when the moon rises and we have a full moon. The third quarter moon is getting smaller and smaller; it is a waning moon. This moon will rise longer and longer after sunset until it rises so long after sunset that it rises with the sun and is called a new moon.

With all this in mind let’s look at the rest of the options:
(c) Meridian at dawn means highest in the sky at dawn. This is going to be a quarter moon; the third quarter moon is highest in the sky at dawn because it rose at midnight.
(e) At midnight the first quarter moon will be setting since it rose at noon.
(j) When the first quarter moon crosses a meridian it is either sunset or sunrise. It crosses the meridian we can see at sunrise so it must cross the meridian we cannot see at sunset, which is sunrise for that part of Earth!

Now, for these last three conditions let’s think about the moon between quarter and full and between quarter and new. The first quarter moon rises at noon and the rises closer and closer to sunset getting larger and larger as it approaches full. So a
(d) moon rising at 3 pm is between first quarter and full, this would be a waxing gibbous moon

(f) A waning crescent is getting smaller and smaller until it becomes a new moon. So at sunrise this moon is near the sun and therefore it is in the eastern sky at sunrise. This is the moon that we often see near Venus, when it is a morning star, and it creates a striking sight!

(g) A waning gibbous is a moon getting closer and closer to third quarter, so this moon will be the first phase after the full moon. The full moon rises later and later after sun set. The waning gibbous rises just after sun set which means that it will set just before sun rise so it will be in the Western sky at sunrise.

Finally, if the moon is full, it means that earth is between the sun and the moon. If we were on the full moon the entire Earth would be in shadow so we would see a ‘new’ Earth. However, since the moon orbits Earth at five degrees to Earth’s equatorial plane, perhaps we would actually see a crescent Earth. That would be a beautiful sight!

If you do find out the actual answer, please share it!
Source  https://answers.yahoo.com/question/index?qid=20110602080125AAmWkks
Mastering in Nutritional Biology
Tralalalala Slight Smile
EA Author
wrote...
9 years ago
Not entirely sure how to answer this, but I found something on Yahoo Answers that might help.

Determine either the position in the sky (western horizon, west, meridian, east, eastern horizon), the time of day (sunrise, 9 am, noon, 3 pm, sunset, 9pm, midnight, 3 am), or the phase of the moon (waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, waning crescent, new) in the following situations:

a) moon is on the eastern horizon at sundown
b) 7 pm and the moon is in the east
c) meridian at dawn
d) rising at 3pm
e) Where in the sky is a first quarter at midnight?
f) Where in the sky is a waning crescent at sunrise?
g) Where in the sky is a waning gibbous at sunrise?
h) What time is it when the full moon is setting?
i) What time is it when the new moon is on the horizon?
j) What time is it when the first quarter moon is crossing the meridian below your horizon? [for you but visible on the other side of the world]
k) Can you see a full moon during the day? Why or why not?
l) If the moon is full and you were standing on the moon, what phase would the earth be?

The guy answers:

There is an easy way to answer all of these questions if you just stop and think for a bit about why the moon looks the way it does. We’ll start with the simplest phases: the full moon and the new moon. In these two phases the sun, moon and Earth are in a straight line.

It is also helpful to keep in mind that the moon, like the sun, always rises in the East and sets in the West. So, when the moon is full it is rising in the East as the sun is setting in the West. When the moon is new it is rising in the East along with the sun.

With this in mind, let us look at the situations:
(a) If the moon is on the Eastern horizon at sundown it is a full or nearly full moon.
(b) 7pm and the moon is in the East could also be a full moon. But this really depends on the time of year. Here in Texas in the summer the sun sets around 9 pm. So, if the moon is in the Eastern sky two hours before sunset it means the moon is going to be full in a day or so. Thus the moon is waxing so we have a waxing gibbous moon.
(h) When the full moon is setting the sun must be rising
(i) When the new moon is on the horizon it is either rising (Eastern horizon) or it is setting (Western horizon). When the moon is new it is not visible to us because it is too close to the sun.
(k) Since the full moon is rising when the sun is setting and setting when the sun is rising it is impossible to see a full moon during the daylight hours.

Now, let’s talk about the quarter moons. When we see a half moon (Sometimes a quarter moon is called a half moon because at all times half of the moon is lit by the sun, just as Earth is, but we see only half of that half, a half of a half is a quarter!) it is because the moon is perpendicular to a line drawn from the sun to Earth. The moon is in the first quarter phase when rises at noon and is highest in the sky at sunset and sets at midnight. When in first quarter the right side of the moon is lighted.

This means that a third quarter moon rises at midnight, highest in the sky at sunrise and sets at noon. The left side of the third quarter moon is lighted.

The first quarter moon is a waxing moon, it is getting larger and larger and it is rising longer and longer after sunrise until it rises so long after sunrise that the sun is setting when the moon rises and we have a full moon. The third quarter moon is getting smaller and smaller; it is a waning moon. This moon will rise longer and longer after sunset until it rises so long after sunset that it rises with the sun and is called a new moon.

With all this in mind let’s look at the rest of the options:
(c) Meridian at dawn means highest in the sky at dawn. This is going to be a quarter moon; the third quarter moon is highest in the sky at dawn because it rose at midnight.
(e) At midnight the first quarter moon will be setting since it rose at noon.
(j) When the first quarter moon crosses a meridian it is either sunset or sunrise. It crosses the meridian we can see at sunrise so it must cross the meridian we cannot see at sunset, which is sunrise for that part of Earth!

Now, for these last three conditions let’s think about the moon between quarter and full and between quarter and new. The first quarter moon rises at noon and the rises closer and closer to sunset getting larger and larger as it approaches full. So a
(d) moon rising at 3 pm is between first quarter and full, this would be a waxing gibbous moon

(f) A waning crescent is getting smaller and smaller until it becomes a new moon. So at sunrise this moon is near the sun and therefore it is in the eastern sky at sunrise. This is the moon that we often see near Venus, when it is a morning star, and it creates a striking sight!

(g) A waning gibbous is a moon getting closer and closer to third quarter, so this moon will be the first phase after the full moon. The full moon rises later and later after sun set. The waning gibbous rises just after sun set which means that it will set just before sun rise so it will be in the Western sky at sunrise.

Finally, if the moon is full, it means that earth is between the sun and the moon. If we were on the full moon the entire Earth would be in shadow so we would see a ‘new’ Earth. However, since the moon orbits Earth at five degrees to Earth’s equatorial plane, perhaps we would actually see a crescent Earth. That would be a beautiful sight!

If you do find out the actual answer, please share it!
thnk uu
wrote...
Staff Member
Educator
9 years ago
Glad to help.
Mastering in Nutritional Biology
Tralalalala Slight Smile
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