Reconstruction of the
1999 Barbury Castle formation

The background picture is taken from this formation

1. Start drawing the outer circle of the formation.

2. Draw all centerlines spaced at 30°.

3. Construct a (first) hexagon (regular 6-fold polygon).

4. From the first one, construct a second inscribed hexagon, as shown.

5. Draw the inscribed circle of this hexagon. This forms the outer border of the ring of the formation.

6. Construct an equilateral triangle, inscribed in the outer circle, as shown.

7. Construct three circles, centered at the cross-points of the centerlines and the inner circle and touching at the equilateral triangle, as shown. These form the inner sides of the half moon patterns.

8. Construct again three circles, centered at the inner cross-points of the circles of the previous step, and also touching at the equilateral triangle, as shown. These circles form the outer sides of the half moon patterns.

9. To make the path-ways, construct three circles concentric with the previous ones and going through the cross-point of the inner circle (outer border of the ring) of step 5 and a centerline, as shown.

10. Extend three centerlines up to the outer sides of the three larger circles. They will be used for the next step.

11. In order to make the other path-ways, draw a (small) circle, centered at the cross-point of the centerline and the smaller circle of step 8, and with a radius equal to the width of the path-way, as shown. Copy this circle to the cross-points of the centerlines and the larger circles.

12. Construct three circles concentric to the larger circles, touching to the small circles at the inner side.

13. The radius of the inner border of the ring (of course concentric with the outer border) is determined by the cross-points of the larger and the smaller circles (steps 7 and 8) at the outmost side, as shown.

14. Now, all circles have been derived to reconstruct the 1999 Barbury Castle formation.

15. The final reconstruction appears after removing all superfluous parts.

16.
courtesy The Crop Circle Connector
photo by: Steve Alexander
The result matched with the original image.