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 semi-circles 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).