2020 Barbury Castle formation
|
Reconstruction of the 2020 Barbury Castle formation | ||
| 1. |
| Draw a circle. Draw and extend the horizontal and vertical centerlines. |
| 2. |
| Construct the circumscribed dodecagon (regular 12-sided polygon) of circle 1, with the mid-point of one side coincident with the upper intersection of circle 1 and the vertical centerline. |
| 3. |
| Construct the circumscribed circle of dodecagon 2. |
| 4. |
| Construct a circle centered at the upper intersection of circle 1 and the vertical centerline, passing through the righthand angular point of dodecagon 2 adjacent to the top. |
| 5. |
| Copy circle 4 to the center of circle 1. |
| 6. |
| Construct a circle concentric to circle 4, tangent to circle 3 at the upper side. |
| 7. |
| Copy circle 6 to the upper intersection of circle 5 and the vertical centerline. |
| 8. |
| Construct a circle concentric to circle 1, tangent to circle 7 at the upper side. |
| 9. |
| Copy circle 6 to the upper intersection of circle 8 and the vertical centerline. |
| 10. |
| Construct a circle concentric to circle 1, tangent to circle 9 at the upper side. |
| 11. |
| Construct a circle concentric to circle 4, tangent to circle 10 at the upper side. |
| 12. |
| Construct the inscribed dodecagon of circle 1, pointing up. |
| 13. |
| Copy circle 11 eleven times, to the other angular points of dodecagon 12. |
| 14. |
| Construct the circumscribed hexagon (regular 6-sided polygon) of circle 1, pointing to the right. |
| 15. |
| Construct the circumscribed circle of hexagon 14. |
| 16. |
| Copy circle 6 to the upper intersection of circle 15 and the vertical centerline. |
| 17. |
| Construct a circle concentric to circle 1, tangent to circle 16 at the lower side. |
| 18. |
| Circles 1, 3, 5, 8, 11, 13, 15, and 17, are used for the final reconstruction. |
| 19. |
| Remove all parts not visible within the formation itself. |
| 20. |
| Colour all areas corresponding to standing... |
| 21. |
| ...or to flattened crop, and finish the reconstruction of the 2020 Barbury Castle formation. |
| 22. |
| The final result, matched with the aerial image. |
| Copyright © 2020, Zef Damen, The Netherlands |
