15 March 2008. - Tinnye, Hungary
From contrail to distrail: 21 March 2008. - Vecsés, Hungary
A jelenség magyarázata itt olvasható.
The explanation of the phenomenon can be read here.
[...] This year was the first day of Pentecost on the nones of June; and on the Tuesday following were seen four circles at mid-day about the sun, of a white hue, each described under the other as if they were measured. All that saw it wondered; for they never remembered such before. (The Peterborough Chronicle, 1104 A.D.)