Motion 3 Part i Looking North For this activity, imagine you are the observer sh

Question

Motion 3 Part i Looking North For this activity, imagine you are the observer shown on Earth in the Northern Hemisphere and that the time is 6 P.M. Looking north, the sky will appear as shown in Figure 1. The positions and motions of the star in Figure 1 can be understood by imagining yourself as the observer at the center of the celestial sphere as shown in Figure 2. In the celestial sphere model, Earth is stationary and the stars are carried on a sphere that rotates about an axis that points at the North Star. Note that only the portion of the celestial sphere that is above your horizon is shown. Celestial Sphere Rotation Path of Star B 1 Celestial Sphere Path of Star A North Star4 North Star ó PM Earth's Equat Horizon Figure I Celestial Sphere Rotation Figure 2 The x's in both figures represent four of the positions through which Star B will pass during the course of one revolution of the celestial sphere. Ignore Star A until Question 6 1) Note in Figure 1 that the position of Star B at 6 P.M. has been identified for you. Circle the numbered position (1, 2, 3, or 4) in Figure 2 that corresponds to the identified location of Star B at 6 P.M. provided in Figure 1 The rotation of the celestial sphere carries Star B around so that it returns to the same position at about 6 P.M. the next evening. Label each of the x's in both figures with the approximate time at which Star B will arrive (e.g., the location you circled in Question 1 will be labeled "6 P.M."). 2) 3) Using Figure 2, describe the direction you have to look to see Star B at 6 A.M. 4) The position directly overhead is called the zenith. Label the direction of the zenith on Figure 2. How does the direction of the zenith compare to the direction that you identified in Question 3? © 2013 Pearson Education, Inc. LECTURE-TUTORIALS FOR INTRODUCTORY ASTRONOM THIRD EDITC

Explanation / Answer

3) we have to look straight up to see star B at 6.00 am

4) direction will be the same.

1) position 3 due to horizon

2) position of x's will be straight up

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