Abstract

Vr ac Circles are a set of five practically concentric circles located in a plain of western Serbia There have not been any systematic archaeological research in the zone but some exploration work indicate a possible date for the earthwork to be around five thousand years ago In this paper we present a sequential analysis of the sizes diameters of the circles that may obey with the help of a gnomonic approach the gnomonic factor an algorithm involving the number of the circle and the height of the gnomon The first assumption is that the smallest radius would be obtained from the shadow of a gnomon on winter solstice at noon the others by the addition to the first a multiple of 1 5 times the gnomon s height At the final stage of the analysis we discuss a possible calendrical meaning of the circles Our results we consider call the archaeologist to look at this place for confirmation or rejection of these hypothesis They may support subsequent development of ideas for the history of mathematics