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Book at Amazon.com   p. 99    IT is now demonstrated that the
earth is a plane, and therefore the distance of the sun may be
readily and most accurately ascertained by the simplest possible
process. The operation is one in plane trigonometry, which
admits of no uncertainty and requires no modification or
allowance for probable influences. The principle involved in the
process may be illustrated by the following diagram, fig. 56.
FIG 56. Click to enlarge  FIG 56.  Let A be an object, the
distance of which is desired, on the opposite side of a river.
Place a rod vertically at the point C, and take a piece of
strong cardboard, in the shape of a right-angled triangle, as B,
C, D. It is evident that placing the  p. 100  triangle to the
eye, and looking along the side D, B, the line of sight D, B, H,
will pass far to the left of the object A. On removing the
triangle more to the right, to the position E, the line E, F,
will still pass to the left of A;