Chapter 3 (cont.) Flashcards
Which type of eclipse may be visible to all the people on one side of Earth?
a total lunar eclipse
What part of the sun is visible during the “peak” of a total solar eclipse?
corona and chromosphere
If the moon is at one of its nodes, it must be which of the following?
on the ecliptic
A total lunar eclipse occurs when the moon is which of the following?
near the ecliptic and at full phase
A total solar eclipse occurs when the moon is which of the following?
at new phase and near the ecliptic
Look at the Phases of the Moon diagram and visualize yourself on Earth looking at the moon.
Which lunar phase would set in the western sky at dawn?
full
Look at the Phases of the Moon diagram and visualize yourself on Earth looking at the moon.
Which lunar phase would rise in the eastern sky at dusk?
full
Look at the Phases of the Moon diagram and visualize yourself on Earth looking at the moon.
Which lunar phase would rise in the eastern sky at noon?
first quarter
Look at the Phases of the Moon diagram and visualize yourself on Earth looking at the moon.
Which lunar phase would rise in the eastern sky at midnight?
third quarter
Imagine you’re an astronaut standing on the moon and looking back at Earth.
What phase would Earth have when the moon is full as seen by an Earth observer?
new
What phase would Earth have when the moon is new as seen by an Earth observer?
full
What phase would Earth have when the moon is at first quarter as seen by an Earth observer?
third quarter
What phase would Earth have when the moon is a waxing crescent as seen by an Earth observer?
waning crescent
Imagine you are on another planet observing its moon.
If the moon orbited the planet in an eastward direction and the planet rotated in the same direction, which of the following is true?
You would see the full moon overhead at midnight.
Imagine you are on another planet observing its moon.
If the moon orbited the planet in a westward direction, but the planet rotated in an eastward direction, which of the following is true?
You would see the last quarter moon overhead at sunrise.
Imagine you are on another planet observing its moon.
If the moon orbited the planet in less than a synodic month, which of the following is true?
It would display the same phases as Earth’s moon, but cycle through them in less time.
Imagine you are on another planet observing its moon.
Imagine that instead of an orbit about the planet’s equator, the moon’s orbit passed over both of the planet’s poles.
The moon would always appear in a quarter phase.
A solar-powered spacecraft passed through Earth’s shadow.
In the outer part of the shadow, the penumbra, what does the spacecraft generate?
some electricity, because it is getting some sunlight, but less than when it is not in Earth’s shadow
A solar-powered spacecraft passed through Earth’s shadow.
In the inner part of the shadow, the umbra, what does the spacecraft generate?
less electricity than when in the outer (penumbral) shadow and much less than when it is not in Earth’s shadow.
A solar-powered spacecraft passed through Earth’s shadow.
In the outer part of the shadow, the penumbra, what does the spacecraft generate?
more electricity than in the umbra
Draw the Earth’s and moon’s umbral and penumbral shadows onto a diagram.
In order to be covered by Earth’s shadow, the moon is in which of the following phases as seen from Earth?
full
Draw the Earth’s and moon’s umbral and penumbral shadows onto a diagram.
In order to block out the sun, the moon is in which of the following phases as seen from Earth?
new
Draw the Earth’s and moon’s umbral and penumbral shadows onto a diagram.
In order to cast a shadow on Earth, the moon is in which of the following phases as seen from Earth?
new
Draw the Earth’s and moon’s umbral and penumbral shadows onto a diagram.
From a position on Earth in the moon’s penumbral shadow, an observer will see a moon phase where the sun is partially covered by a _____ moon.
new
What is true of the solar corona?
it is the outermost layer of the sun
Visibility of the solar corona is limited by which of the following?
the brightness of the sun’s photosphere
During which eclipse type will the solar corona be observable?
a total solar eclipse
When will the moon will be eclipsed?
if it is at one node of its orbit the same time the sun is at the opposite node
When will the moon not be eclipsed?
if the moon is halfway between the nodes of its orbit
If the moon is halfway between the nodes of its orbit, what will occur?
No eclipse will occur.
When does an eclipse season occur?
any time the sun appears at a node of the moon’s orbit
What is the Saros cycle?
the amount of time for the exact pattern of eclipses to repeat itself
What is true about eclipses visible from a given location on Earth?
the same for every third Saros cycle
What is true of the Saros cycle?
It is an exact number of months.
What is true of two solar eclipses separated by one Saros cycle?
They will not be visible from the same location, because the Saros cycle is not a whole number of days.
Thales of Miletus is thought to have predicted which of the following
a solar eclipse
To predict an eclipse, it is necessary to have knowledge of which of the following?
the Saros cycle
The amount of time between two solar eclipses visible from the same location is about
54 years
The postage stamp below shows a crescent moon in a starry night sky. What is wrong with the depiction of the moon in this picture?
The points of the moon’s crescent always point away from the sun, so the sun should be visible in the sky.
