Why do astronomers prefer using right ascension and

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15. Why do astronomers prefer using right ascension and declination as opposed to using altitude ad azimuth?
16. What is the azimuth of any objectwhen it crosses the meridian at any time of yearin the southern sky?
17. If a star has a RA of 5 hours and crosses the meridian at 10:45 pm, what is the RA of a star that crosses the meridian at 1:00 am? Explain your answer.
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18. What is the Sun's altitude when it crosses the meridian in Syracuse, NY (+43N) and its declination is +23.5°?
19. What is the altitude of the NCP at Fairbanks, Alaska (lat. = 65° N)?
20. How do the positions of the equinoxes and solstices with respect to the horizon depend on the latitude?

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