The
West Overton double spiral  or actually not
found June 23, 2002
UK crop circles are made of circles and straight lines.
That seems to be a rule with very few exceptions. So I was naturally
excited to see this spiral looking new formation  yet assuming the
spiral would actually be made of circular arcs. This indeed turned
out to be the case, as will be displayed in this study.
aerial photo by Steve Alexander
The image above shows a true arithmetic spiral exposed
over the aerial photo. Though it seems to match at first glance, if
you start following the red curve you will see it doesn't. It escapes
in and out of the crop circle trail (every second time outwards, every
second time inwards)  this clearly suggests the spiral is made of
circular arcs.
At first I thought quarter or even one sixth circles
would have been used. However, it turned out to be semicircles after
all.
Here you can see how it's made. You start by making
a small circle in the middle. Then you draw larger circles on both
side always centered on the opposite edges of the first circle. The
diameter is always increased with the diameter of the original circle.
This is repeated 6 times on both sides, making the final circles 12
times as large as the first one in diameter. The two satellite circles
are same size as the central one. The satellites are located at 36
degrees compared to horizontal  that is one tenth of a full circle
(I think in the above diagram the green lines were supposed to meet
in the middle).
