This formation north of Yatesbury (SU 066-735) was starting to
look rather grown-in when I shot it July 29th. A microlight
pilot who I don't know reported it nearly a week earlier -- but
the circle is inside the Lyneham airbase restricted zone just
far enough that it can't be seen from outside, and it took all
this time to get permission to go inside.
It is part of the family of formations made with straight lines,
which include the nine-fold formation that appeared below Milk
Hill July 12th.