2017 Cherhill White Horse formation
Construct the circumscribed heptagon of heptagon 7, pointing to the left.
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Reconstruction of the 2017 Cherhill White Horse formation | ||
| 1. |
| Draw a circle. Draw and extend the horizontal and vertical centerlines. |
| 2. |
| Construct the inscribed heptagon (regular 7-sided polygon) of circle 1, pointing to the right. |
| 3. |
| Construct the inscribed circle of heptagon 2. |
| 4. |
| Construct the inscribed heptagon of circle 3, pointing to the right. |
| 5. |
| Construct the inscribed circle of heptagon 4. |
| 6. |
| Construct the circumscribed heptagon of circle 1, pointing to the left. |
| 7. |
| Construct the circumscribed heptagon of (the circumscribed circle of) heptagon 6, pointing to the right. |
| 8. |
| Repeat this three times. Construct the circumscribed heptagon of heptagon 7, pointing to the left. |
| 9. |
| Construct the circumscribed heptagon of heptagon 8, pointing to the right. |
| 10. |
| Construct the circumscribed heptagon of heptagon 9, pointing to the left. |
| 11. |
| Construct the circumscribed circle of heptagon 10. |
| 12. |
| Extend the upper and lower lefthand sides of heptagon 10 to the left, upto the horizontal centerline. |
| 13. |
| Construct a circle centered at the lefthand angular point of heptagon 10, tangent to circle 1 at the lefthand side. |
| 14. |
| Copy circle 13 to the intersection of lines 12, and move this circle (copy and delete original) to its own righthand intersection with the horizontal centerline. |
| 15. |
| Construct a circle centered at the lefthand intersection of circle 1 and the horizontal centerline, tangent to circle 3 at the lefthand side. |
| 16. |
| Construct a circle concentric to circle 15, tangent to circle 5 at the lefthand side. |
| 17. |
| Copy circles 15 and 16 to the righthand intersection of circle 14 and the horizontal centerline. |
| 18. |
| Construct two circles concentric to circle 14, tangent to circles 17 at the lefthand sides. |
| 19. |
| Construct a "two-points" circle (defined by the two end-points of a centerline) between the lefthand intersections of circles 3 and 5 with the horizontal centerline. |
| 20. |
| Construct a circle concentric to circle 19, tangent to circle 1 at the lefthand side. |
| 21. |
| Construct a circle concentric to circle 19, tangent to circle 15 at the lefthand side. |
| 22. |
| Copy circles 19, 20, and 21 two times, to the centers of circles 1 and 14. See detail. |
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| 23. |
| Construct three pairs of parallel lines, tangent to circles 22 at both sides. See detail. |
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| 24. |
| Construct a "two-points" circle between the lefthand intersection of circle 5 and the righthand intersection of the outer righthand circle 22 with the horizontal centerline. |
| 25. |
| Circles 1, 3, 5, 11, 14, 18, and 24, and lines 23, are used for the final reconstruction. |
| 26. |
| Remove all parts not visible within the formation itself. |
| 27. |
| Colour all areas corresponding to standing... |
| 28. |
| ...or to flattened crop, and finish the reconstruction of the 2017 Cherhill White Horse formation. |
| 29. |
| The final result, matched with the aerial image. |
| Copyright © 2017, Zef Damen, The Netherlands |
