HW2 Part2
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School
Oklahoma State University *
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Course
1014
Subject
Astronomy
Date
Dec 6, 2023
Type
Pages
2
Uploaded by DeanExploration11719
HW2 Part2 (10 pts)
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answers so that the graders can easily discern your answers from the questions.
In the celestial sphere model, Earth is stationary and the stars are carried on a sphere that rotates about an
axis that points at Polaris, the “North Star”. (Recall that this is not what is actually happening.)
In the figure below, two stars, Star A and Star B, are each shown at four different positions (1, 2, 3, and 4)
through which each star will pass over the course of one revolution of the celestial sphere. You (the
observer) are located on the Earth in the Northern Hemisphere, and the portion of the celestial sphere that
is above your horizon is shown.
1.
Is Star A ever in an unobservable position? If so, which position(s)? If not, please explain why it
has no unobservable positions.
2.
Is Star B ever in an unobservable position? If so, which position(s)? If not, please explain why it
has no unobservable positions.
Yes, Star A would be unobservable at point A. The horizon would block us from seeing
the star.
No, Star B has no unobservable position because it never sets below the Earth's horizon
from our view point.
3.
Which star, Star A or Star B, has a larger altitude angle when both are at their position 2s.
4.
When Star A is at position 1, what is it said to be doing?
Hint: It may help you to draw the
cardinal directions on this figure.
5.
When Star A and Star B are both located at their position 2s, what are they said to be doing?
Hint:
It may help you to draw the cardinal directions on this figure.
6.
Which star has a larger Declination angle? (circle one)
•
Star A
•
Star B
7.
Which star is closer to the celestial equator? (circle one)
•
Star A
•
Star B
Star B has the larger altitude at it's 2nd position. It sits at out zenith point which is 90
degrees.
It is rising east to west.
They are both setting into the west.
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