Kako vemo, da so stari Slovani poznali gnomone?

Upright pillars are also part of the mythical landscape of the ancient Slavs. The fact that a column was used as a gnomon can be inferred from the existence of the effects of its action found in the landscape: the cardinal directions, the azimuths of sunrise and sunset significant for the date, an angle corresponding to the obliquity of the ecliptic. The alleged circular argument that triangles define an angle and the same angle defines the same triangles is a Bilić construct and mathematically impossible, since we cannot define a triangle with only one angle. However, even if the astronomical knowledge of the ancient Slavs in the present were really justified by a purely circular argument (which is not the case), it does not mean that the ancient Slavs had no astronomical knowledge.Pokončni stebri so tudi del mitične pokrajine starih Slovanov. Na dejstvo, da je bil tak steber uporabljen kot gnomon, je mogoče sklepati iz obstoja učinkov njegovega delovanja, ki jih najdemo v pokrajini: smeri neba, datumsko pomembni azimuti sončnega vzhoda in sončnega zahoda, kot, ki ustreza nagibu ekliptike. Domnevni krožni argument, da trikotniki definirajo kot in isti kot definira iste trikotnike, je Bilićev konstrukt in je matematično nemogoč, saj trikotnika ne moremo definirati samo z enim kotom. A tudi če so astronomsko znanje starih Slovanov res utemeljevali v sedanjosti s povsem krožnim dokazom (kar pa niso), to še ne pomeni, da stari Slovani niso imeli astronomskega znanja