PHYS 1062: CH. 3 THE CYCLES OF THE MOON
35 Cards in this Set
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The time for one cycle of lunar phases is
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the same as the time for one cycle of the moon relative to the sun
– complete cycle takes about 29 ½ days.
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By approximately how many degrees does the moon's position change from one day to the next?
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13 degrees
-It moves 360 degrees in 28 days, so roughly 13 degrees per day.
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True or False:
The full moon is never visible at noon.
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True
The full moon is only visible from sunset to sunrise.
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During a lunar eclipse, what is the correct ordering of celestial bodies?
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Sun, Earth, Moon
-the Moon is in the Earth's shadow
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If Earth did not rotate, how would our view of the moon differ?
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The moon would almost appear to hold still during the course of a 24 hour day, only moving 1/28th of a full circle around us.
-Its only motion would be due to its 28 day orbit.
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The Moon appears darkest when it passes into which part of the Earth's shadow?
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The umbra
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Why does the Moon turn red during a lunar eclipse?
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Scattering of blue light in the Earth's atmosphere
-this is the same reason sunsets are red
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If you are on Earth, Which lunar phase would be visible in the sky at dawn?
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waning crescent
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If you are on Earth, Which lunar phase would be visible in the sky at dusk?
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waxing crescent
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If you are on Earth, Which lunar phase would be visible in the sky at noon?
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waning crescent
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If you are on Earth, Which lunar phase would be visible in the sky at midnight?
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full moon
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Imagine you're an astronaut standing on the moon and looking back at Earth.What phase would Earth have when the moon is full?
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new moon
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Imagine you're an astronaut standing on the moon and looking back at Earth. What phase would Earth have when the moon is new
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Full Moon
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Imagine you're an astronaut standing on the moon and looking back at Earth. What phase would Earth have when the moon is at first quarter
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Last Quarter
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Imagine you're an astronaut standing on the moon and looking back at Earth. What phase would Earth have when the moon is a waxing crescent
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waning gibbous
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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
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The moon would always appear in a quarter phase.
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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, what moon would you see?
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You would see the last quarter moon overhead at sunrise.
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Imagine you are on another planet observing its moon, If the moon orbited the planet in less than a month, what would be displayed?
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It would display the same phases as Earth's moon, but cycle through them in less time.
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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, what moon would you see?
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You would see the full moon overhead at midnight.
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In order to be covered by Earth's shadow, the moon is
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it must be full
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In order to block out the sun as seen from Earth, the moon is
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it must be new
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In order to cast a shadow on Earth, the moon is
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it must be new
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From a position on Earth in the moon's penumbral shadow, what will an observer will see?
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the sun partially covered by a new moon
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What is true of the solar corona?
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it is the outermost layer of the sun
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Visibility of the solar corona is limited by
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the brightness of the sun's photosphere
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During which eclipse type will the solar corona be observable?
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a total solar eclipse
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What can be said about the maximum duration of lunar and solar eclipses?
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A lunar eclipse can last up to almost six hours and a solar eclipse up to 7.5 minutes.
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When will the moon will be eclipsed?
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if it is at one node of its orbit the same time the sun is at the opposite node
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When will the moon not be eclipsed?
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if the moon is halfway between the nodes of its orbit
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If the moon is halfway between the nodes of its orbit, what will occur?
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no eclipse will occur
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When does an eclipse season occurs?
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anytime the sun appears at a node of the moon's orbit
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What is the Sidereal Month?
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One lunar orbit with respect to the stars it takes 27.3 days
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What is the Synodic Month?
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The time it takes for a lunar phase to complete. It takes 29.5 days
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The moon moves exactly along the ecliptic. True or False
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False it moves along but not exactly along the ecliptic
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What is the ecliptic?
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The apparant path of the sun around the sky
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PHYS 1062: ASTRONOMY EXAM 3