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In the Vatican there is tapestry made following the same drawing used by Leonardo to realize the Last Supper in Milan.
In this tapestry some vertical lines are clearly visible on the tablecloth.
A couple of scholars affirm that the tablecloth with these vertical lines are there to reproduce the Ptolemy's conic projection.
interesting!
According to them every Apostle represents also an astrological sign: Bartolomeus is Piscis as I have affirmed and they don't know my work.
In this Ptolemy's conic projection (the tablecloth) the Parallel of Equator is the horizontal line of the table.
I used this very line to calculate the geographic coordinates using it as parallel of referement.
They also affirm that each Apostle represents a zone of the Ptolemy map: Bartolomeus is in the most western area of TULE.
His left hand is at the latitude of Tule, in this map the other horizontal board of the table.