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Which of the following describes parallax?


A) It is best measured over exactly one year intervals.
B) It is inversely proportional to the distance to the star.
C) It was first observed by Galileo with his new telescope.
D) It is only applicable to objects within the solar system.
E) It is more accurate as the distances to objects become greater.

F) A) and B)
G) C) and E)

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Describe how Erastothenes measured the circumference of our planet.

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Using the fact that the noon solstice Su...

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Of all visible objects in the celestial sphere, which appears to move the least? Why?

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Polaris, because it lies very ...

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Where on Earth can you observe all the stars in the sky over an entire year?


A) North Pole
B) Arctic Circle
C) Tropic of Cancer
D) Equator
E) Everyone on Earth can see the whole sky.

F) All of the above
G) A) and B)

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Why are some solar eclipses total, and others annular?

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The Moon's orbit is not a perf...

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Over the course of a night, Polaris moves less than any other visible star in the sky.

A) True
B) False

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