2018 Gurston Ashes formation
Draw two connecting lines, between A and D, and between C and D.
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Reconstruction of the 2018 Gurston Ashes formation | ||
| 1. |
| Draw a circle. Draw the horizontal and vertical centerlines. |
| 2. |
| Construct the inscribed dodecagon (regular 12-sided polygon) of circle 1, pointing to the right. |
| 3. |
| Construct the inscribed circle of dodecagon 2. |
| 4. |
| Construct the inscribed square of circle 3, pointing to the right. |
| 5. |
| Construct the inscribed hexagon (regular 6-sided polygon) of circle 3, pointing to the right. |
| 6. |
| Construct the inscribed nonagon (regular 9-sided polygon) of circle 3, pointing to the right. |
| 7. |
| Call the top of square 4: A, its righthand angular point: B, the lower righthand angular point of hexagon 5: C, and the leftmost upper angular point of nonagon 6: D. Draw two connecting lines, between A and D, and between C and D. |
| 8. |
| Construct a circle centered at C, passing through the lower righthand intersections of hexagon 5 and nonagon 6. |
| 9. |
| Copy circle 8 to the center of circle 1. |
| 10. |
| Copy circle 8 three times, to A, B, and D. |
| 11. |
| Construct four lines, parallel to the sides of, and inside quadrangle ABCD, tangent to circles 8 and 10, as shown. |
| 12. |
| Construct a circle centered at A, passing through the intersection of the upper righthand side of square 4 and the upper lefthand side of nonagon 6. |
| 13. |
| Copy circle 12 three times, to B, C, and D. |
| 14. |
| Construct four lines, similar to lines 11, but tangent to circles 12 and 13. |
| 15. |
| Construct a circle centered at A, passing through the intersection of the upper righthand side of square 4 and the upper side of hexagon 5. |
| 16. |
| Copy circle 15 to the center of circle 1. |
| 17. |
| Construct a circle centered at A, tangent to circle 1 at the upper side. |
| 18. |
| Copy circle 17 to the righthand intersection of circle 16 and the horizontal centerline. |
| 19. |
| Construct a circle concentric to circle 1, tangent to circle 18 at the lefthand side. |
| 20. |
| Circles 1, 9, 16, and 19, square 4, hexagon 6, and lines 7, 11, and 14, are used for the final reconstruction. |
| 21. |
| Remove all parts not visible within the formation itself. |
| 22. |
| Colour all areas corresponding to standing... |
| 23. |
| ...or to flattened crop, and finish the reconstruction of the 2018 Gurston Ashes formation. |
| 24. |
| The final result, matched with two aerial images. |
| Copyright © 2018, Zef Damen, The Netherlands |
