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Unformatted text preview: at left. Final location: 20S, 30W. (b) This rotation of 60 is simply done by spinning about a pin through the center, shown below at right. Final location: 27S, 48E. Solution 2-14 2 (c) Rotation about an inclined axis requires that the rotation axis be placed in a useful orientation. That makes this solution a three-step procedure. First, rotate the rotation axis 30E and 10N to position it on the center of the stereographic projection, which makes the rotation axis normal to the page. This same operation must be applied to Pole A, locating it at 30N, 80E. Second, rotate the full projection by spinning it the required 60 about a pin in the center. Finally, restore the original orientation by a reverse 10S and 30W rotation. Final location: 39S, 51E....
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- Spring '08