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Astro111N_ch2

QuestionAnswer
which statement best describes how variation in the Earth-Sun distance affects the seasons? The variation in Earth–Sun distance over the course of each year has virtually no effect on the seasons.
You’ve now seen that Earth’s varying distance cannot be the cause of our seasons. So what is the cause of the seasons? The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year.
At most times, Mars appears to move __________ relative to the stars. The exceptions are during its periods of apparent retrograde motion, when Mars appears to move __________ relative to the stars. to the left (eastward), to the right (westward)
If you wanted to document the apparent retrograde motion of Mars, you would need to measure and record Mars's __________ over a period of __________. position among the constellations, several months
What is really happening in space during the periods when we see Mars going through apparent retrograde motion? Earth is passing by Mars in its orbit around the Sun.
Consider a time when Mars is in the middle of one of its periods of apparent retrograde motion. During this time, Mars appears _____ in our night sky and crosses the meridian around _____. brightest , midnight
Should these facts alone have been enough to convince the ancient Greeks that Earth really does go around the Sun? No, because the Greeks had an Earth-centered model that also accounted for apparent retrograde motion.
Two stars that are in the same constellation: may actually be very far away from each other.
The North Celestial Pole is 35.0∘ above your northern horizon. This tells you that: you are at latitude 35.0∘ N.
Beijing and Philadelphia have about the same latitude but very different longitudes. Therefore, tonight's night sky in these two places: will look about the same.
n winter, Earth's axis points toward the star Polaris. In spring: the axis also points toward Polaris.
When it is summer in Australia, the season in the United States is winter.
If the Sun rises precisely due east: it must be the day of either the spring or fall equinox.
A week after full moon, the Moon's phase is: third quarter.
Some type of lunar or solar eclipse (not necessarily a total eclipse) occurs at least four times a year
If there is going to be a total lunar eclipse tonight, then you know that: the Moon's phase is full.
When we see Saturn going through a period of apparent retrograde motion, it means Earth is passing Saturn in its orbit, with both planets on the same side of the Sun.
Created by: zemca
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