This right angle reveals the infrastructure of the entire graphic display of the DZ, which could not have been unintentional. Considered as the illustrated face of a cosmic clock, the circle of thirteen Zodiacal constellations has to have a zero hour defined from outside the Zodiac
. Otherwise, there is no way to know where the sequence of Ages begins and ends. The external or extra-Zodiacal point that defines the Zodiacal sequence is the galactic center, located by a sightline toward the tip of the Archer's arrow. When the winter solstice reaches this point in 2216 CE, the current precessional cycle of 25,920 years ends, and a new one begins. The Mayan, Aztec, Egyptian and Hindu calendars can be correlated to this date, using the DZ at the master template, the revelation of the Zodiacal Ages.