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Astronomy 100

Chapter 3-Cycles of the Sky

QuestionAnswer
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.
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.
What variation in the seasons allows for the advance of glaciers? Cooler northern summers.
Which type of eclipse may be visible to all the people on one side of Earth? A total lunar eclipse.
The third quarter phase moon rises at about: midnight
When it is autumn in Asia, what season is it in Antarctica? spring
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.
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.
What evidence matches the results of Milankovitch's solar heating calculations? Global ocean water temperatures deduced from sea floor sediments.
A total solar eclipse occurs when the moon is: both a and b above.
If the moon reaches full phase on May 6, it is at ________ phase on May 17. waning crescent
The time for one cycle of lunar phases is: the same as the time for one cycle of the moon relative to the sun.
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
What part of the sun is visible during the peak of a total solar eclipse? Both b and c above.
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.
During a total lunar eclipse, the moon is: both b and c above.
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.
The five naked eye planets and three telescopic planets that wander among the stars in the sky are always near the: ecliptic.
Based on this figure, in what constellation is the sun on July 1 each year? Gemini
Why does the sun move relative to the stars as described in the previous question? t is due to Earth revolving around the sun.
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.  
In one cycle of lunar phases, each crescent and gibbous phase (waxing or waning) has a duration of about one: week.
If the moon is at one of its nodes, it must be: on the ecliptic.
A total lunar eclipse occurs when the moon is: both b and c above.
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.
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.
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.
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.
Which planet is the most difficult to observe, as it is always close to the sun in our sky? Mercury
Which of the following is true about the umbra of the moon's shadow? Choices a and c above.
Created by: dabruns