54:10 · This is one of the most recent ideograms in Western ideography. is the sign used to represent the planet Chiron, that was discovered in the 1970s.
    Chiron is orbiting between the orbits of Saturn and Uranus with an orbital period of 51 years. The astrologers believe it to be related to the sign of Sagittarius, , and have characterized it with such keywords as teacher and healer.
    Another sign for Chiron is .