Re: circular earth...

Posted by Dale on Mar 28, 2002 at 13:58

Re: circular earth... (dogrock)

The Romans placed sticks in a canal all two feet above the water line and observed the curvature of the earth by looking along the sticks.

Ok, we go to a really calm lake and put a stick in the water cutting it off 2 feet above the water line. Now we row 1 mile out in the lake and float another stick with a mark 2 feet above the water line. Finally we row another mile and place a third stick. Now we sight from the third stick past the second stick to the first 2 miles away. How far off is the mark on the second stick?

5280*12=sqrt(R^2-(R-x)^2) where R is the radius of the earth in inches and x=the height of the mark on the center stick above a straight line in inches.

x=8 inches

You really think your eyes are that good? Instead of having to sight across sticks 2 miles apart, letís move them a little closer. How about a football field? The height change you have to see is less than ľ inch. Somehow I donít think you can see the curvature of the earth and not attribute it to a mismeasurement.

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