Astro set 4
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Nicholas Copernicus book was called
The Revolution of the HeavenlyOrbs
All the following statements are true. Which
one explains the reason that there is not a solar eclipse at
every new moon?
The orbital plane of the Moon is tilted slightly (by about 5 degrees) to the ecliptic plane.
Based on observations of the universal
expansion, the age of the universe is about ________.
14 billion years
How many arcseconds are in one arcminute?
He discovered that the orbits of planets are
What is the saros cycle?
The roughly 18-year cycle over which the pattern of eclipses repeats
What do astronomers mean by a constellation?
A constellation is a region in the sky as seen from Earth.
In the Greek geocentric model, the retrograde
motion of a planet occurs when:
The planet actually goes backward in its orbit around Earth.
We cannot see a new moon in our sky because
a new moon is quite near the Sun in the sky
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