history of crop circles 1997 https://www.cropcirclesecrets.org/crop_circles_history97a.html The first major crop circle of 1997 appeared in oilseed rape (canola) below Barbury Castle. Very similar to last year's Littlebury Green, Essex, formation, it is a ringed circle with six crescents. This formation encodes Ptolemy's theorem of chords, the foundation of trigonometry (below left).
