2020 Chirton Bottom formation
|
Reconstruction of the 2020 Chirton Bottom formation | ||
| 1. |
| Draw a circle. Draw and extend the horizontal and vertical centerlines. |
| 2. |
| Copy circle 1 to its upper intersection with the vertical centerline. |
| 3. |
| Copy circle 1 to its lower intersection with the vertical centerline. |
| 4. |
| Construct a circle concentric to circle 1, tangent to circle 2 at the upper side. |
| 5. |
| Construct the inscribed regular 15-sided polygon of circle 4, pointing up. Number the angular points clockwise 1 - 15, starting at the top. |
| 6. |
| Draw the connecting line between angular points 5 nrs. 2 and 15. |
| 7. |
| Construct a circle concentric to circle 1, tangent to line 6. |
| 8. |
| Construct a "two-points" circle (defined by the two end-points of a centerline) between the upper intersections of circles 4 and 7 with the vertical centerline. |
| 9. |
| Copy circle 8 to the upper intersection of circle 1 and the vertical centerline. |
| 10. |
| Construct a line parallel to the horizontal centerline, tangent to circle 9 at the upper side, and extend this line upto circle 7 in both directions. |
| 11. |
| Construct a line parallel to the horizontal centerline, tangent to circle 9 at the lower side, and extend this line upto circle 7 in both directions. |
| 12. |
| Construct a line parallel to the horizontal centerline, tangent to circle 1 at the lower side, and extend this line upto circle 7 in both directions. |
| 13. |
| Copy circle 8 to the lower intersection of circle 1 and the vertical centerline, and move this circle (copy and delete original) to its own corresponding intersection. |
| 14. |
| Construct a line parallel to the horizontal centerline, tangent to circle 13 at the lower side, and extend this line upto circle 7 in both directions. |
| 15. |
| Construct a line parallel to the horizontal centerline, passing through the center of circle 9, and extend this line upto circle 7 in both directions. |
| 16. |
| Draw the ray of polygon 5 from the center to angular point nr. 15. |
| 17. |
| Draw the connecting line between angular points 5 nrs. 5 and 12. |
| 18. |
| Draw the ray of polygon 5 from the center to angular point nr. 7. |
| 19. |
| Draw the connecting line between the intersection of line 15 and ray 16, and the intersection of line 17 and ray 18, and extend this line upto circle 4 in both directions. |
| 20. |
| Circles 4 and 7, and lines 10, 11, 12, 14, and 19, 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 2020 Chirton Bottom formation. |
| 24. |
| The final result, matched with the aerial image. |
| Copyright © 2020, Zef Damen, The Netherlands |
