Thinking about this some more.
Assuming Ra meant 20 degrees east of north as measured from Louisville, KY, and assuming that means that the pole will move roughly 20 times the distance of one degree at Louisville, which is 54.27 miles per the formula given here: http://wiki.answers.com/Q/How_many_miles...r_latitude and the latitude for Louisville given here: http://www.travelmath.com/cities/Louisville,+KY
That means the pole needs to move 20 x 54.27 = 1085.40 miles. Ra spoke in 1981. Since then, it's moved 9 MPY for 8 years (the article says it moved 9MPY from 1904 to 1989), which gives 72 miles, something more than that from 1989 - 2007 (est. 15 MPY x 18 Y = 270 miles), and ~35 MPY since 2007 (= ~175 mi). So since 1981 it's moved roughly 72 + 270 + 175 = 517 miles, leaving ~568 to go.
Assuming Ra meant 20 degrees east of north as measured from Louisville, KY, and assuming that means that the pole will move roughly 20 times the distance of one degree at Louisville, which is 54.27 miles per the formula given here: http://wiki.answers.com/Q/How_many_miles...r_latitude and the latitude for Louisville given here: http://www.travelmath.com/cities/Louisville,+KY
That means the pole needs to move 20 x 54.27 = 1085.40 miles. Ra spoke in 1981. Since then, it's moved 9 MPY for 8 years (the article says it moved 9MPY from 1904 to 1989), which gives 72 miles, something more than that from 1989 - 2007 (est. 15 MPY x 18 Y = 270 miles), and ~35 MPY since 2007 (= ~175 mi). So since 1981 it's moved roughly 72 + 270 + 175 = 517 miles, leaving ~568 to go.
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