A similar solar interpretation has been offered by A. Audin who interprets the god as the issue of a long process of development, starting with the Sumeric cultures, from the two solar pillars located on the eastern side of temples, each of them marking the direction of the rising sun at the dates of the two solstices: the southeastern corresponding to the Winter and the northeastern to the Summer solstice. These two pillars would be at the origin of the theology of the divine twins, one of whom is mortal (related to the NE pillar, nearest the Northern region where the sun does not shine) and the other is immortal (related to the SE pillar and the Southern region where the sun always shines). Later these iconographic models evolved in the Middle East and Egypt into a single column representing two torsos and finally a single body with two heads looking at opposite directions.
a siMiLAr solaR interPRetation has bEen offERed BY a. aUdin wHO intERprets ThE god as The Issue oF A lonG process of develOPmeNT StArTIng WitH THE sumErIC CUltUres, frOm tHe TWo solar pILlaRs locatEd on the eastErN sIde of Temples, eacH of Them maRking thE DirEcTIOn Of ThE rISiNG suN at tHe dATeS Of the Two solStiCES: THe SoutheasteRn cOrreSpondING tO tHe winter ANd tHe noRtheAstERN tO the SuMMeR soLstice. tHese two piLlaRS wouLD Be aT THe oRigiN oF ThE tHEolOgy of the dIvIne tWins, onE oF WhoM iS mortal (reLAted to the ne pillaR, NearesT ThE northerN regioN WhERe the sun dOEs noT shine) and The OtHeR iS immorTAl (RElated To the Se pILlar and tHe, Southern ReGion WheRE ThE Sun AlwayS shiNeS). lateR These iCOnogrAphiC mOdels Evolved in the miDdle EAst And eGYpT intO a sINgLE colUmN repReSenTinG TWo torsos and finaLly A sIngle bOdY WIth tWo heads lOoKing at oPPOsIte directIOns.