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Considering the fact that ecclesiastical rules do not precisely say that a  church must be directed “to the East” or “to sunrise”, it should always be  checked if there is a connection between the orientation of a church and  geometry of the Sun. In this paper, such examination is performed on the  example of the church of St. John (the 13th century), one of four churches of  the Studenica monastery, in the following way: 1) using gnomon method, the  azimuth of the main longitudinal axis of the church is measured; 2) the  altitude above the horizon of the point in which the extended axis of the  church touches the true horizon is determined by cartometry; 3) the most  probable dates when the Sun rises at that point are determined: May 7th  according to Gregorian calendar, or April 30th according to Julian calendar,  in the 13th century. The applied method is described in details and it can be  applied for the analysis of the orientation of any other medieval church.  This method can determine the time when the church was founded, as well as  the fact if the church is original, or possibly erected on the foundations of  some older sacral object

Mathematical-geographical analysis of the orientation of St John’s church of the Studenica monastery