Chapter 3-Cycles of the Sky
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| We observe that the angular diameter of the moon is about same as the angular diameter of the sun (about 1/2 degree). We also know that the AU is about 390 times the average Earth-moon distance. What can we conclude? | The linear diameter of the sun is about 390 times the linear diameter of the moon.
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| How does one cycle of the moon's motion relative to the stars compare to one cycle of the moon's motion relative to the sun? | The cycle relative to the stars is shorter than the cycle relative to the sun.
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| What variation in the seasons allows for the advance of glaciers? | Cooler northern summers.
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| Which type of eclipse may be visible to all the people on one side of Earth? | A total lunar eclipse.
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| The third quarter phase moon rises at about: | midnight
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| When it is autumn in Asia, what season is it in Antarctica? | spring
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| If you could see the sun and stars during the daytime for several weeks, you would notice that the sun: | moves slowly eastward relative to the stars.
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| Compare the range in angular size for the sun and moon shown in this figure. From these ranges we can conclude that: | Earth's orbit around the sun is less elliptical than the moon's orbit around Earth.
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| What evidence matches the results of Milankovitch's solar heating calculations? | Global ocean water temperatures deduced from sea floor sediments.
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| A total solar eclipse occurs when the moon is: | both a and b above.
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| If the moon reaches full phase on May 6, it is at ________ phase on May 17. | waning crescent
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| The time for one cycle of lunar phases is: | the same as the time for one cycle of the moon relative to the sun.
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| The Milankovitch hypothesis proposes that the ice ages on Earth are due to long-term changes in the amount of seasonal solar heating at high latitudes brought about by: | all of the above
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| What part of the sun is visible during the peak of a total solar eclipse? | Both b and c above.
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| Why is the amount of solar heating less at northern latitudes on a clear day in January than on a clear day in July? | Both a and c above.
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| During a total lunar eclipse, the moon is: | both b and c above.
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| Suppose that the inclination of Earth's equator with its orbital plane increases from 23.5 degrees to 90 degrees. What effect would such an increase have on the seasons? | Winter would be colder and summer hotter.
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| The five naked eye planets and three telescopic planets that wander among the stars in the sky are always near the: | ecliptic.
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| Based on this figure, in what constellation is the sun on July 1 each year? | Gemini
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| Why does the sun move relative to the stars as described in the previous question? | t is due to Earth revolving around the sun.
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| Which of the following is true for an observer located at the tip of the umbra in this figure? | The angular size of the tack is the same as the angular size of the light source.
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| In one cycle of lunar phases, each crescent and gibbous phase (waxing or waning) has a duration of about one: | week.
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| If the moon is at one of its nodes, it must be: | on the ecliptic.
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| A total lunar eclipse occurs when the moon is: | both b and c above.
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| What is the present relationship between the variation of the Earth-sun distance from the average, and the seasons? | Earth is 1.7% closer to the sun during northern winters.
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| Of the six total lunar eclipses listed in this table, which two definitely cannot be observed by someone under clear skies located in Greenwich, England? | Earth is 1.7% closer to the sun during northern winters.
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| How does the moon's motion relative to the stars compare to the sun's motion relative to the stars? | The moon moves faster than the sun and in the same direction.
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| Which statement below best describes the motion of the moon relative to the stars? | The moon moves eastward relative to the stars about 13 degrees per day.
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| Which planet is the most difficult to observe, as it is always close to the sun in our sky? | Mercury
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| Which of the following is true about the umbra of the moon's shadow? | Choices a and c above.
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