The height of the Rose Window again becomes interesting since it would then represent 47/13 lunar months, since 47 lunar months is one fifth of the Metonic period. Would one wish to divide 47 lunar months (the Octon eclipse period) by the 13 month lunar year? If so, 106.76444 days result - the exact same result as if one had divided four times the Metonic (the Callipic) by the 260-day Tzolkin. This means there are 260 periods of 47/13 lunar months in the Calippic period of four Metons. This leads to coherence between the Olmec/Maya calendar and the Metonic system of counting lunar months between the 223 lunar months of the Saros period and the 235 lunar months of the Metonic period.
Figure 1 Time periods implicit in the Rose Window's height as 47/13 lunar month
Having found Olmec time periods within the design of Chartres: the 20 day Uinal, the 360 day Tun, the 365 day Haab and the 260 day Tzolkin, we note the Tzolkin period of 260 days was unknown (or unrecorded) as the Old World, There is a sense that whoever built Chartres could have been privy to ancient knowledge either never revealed or subsequently lost to medieval Europe, here simply stated as the 47/13 lunar months, encoded in the height of the Rose Window and distance of the Labyrinth from a shared datum. The towers then gave the two lunar years required to count the Metonic and created a cosmogram for the floor plan.