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