It is the identification of as the missing bridge. Walker discovered that Gann’s "Master Time Factor" operates on a cycle of 144 degrees of planetary movement (specifically the geocentric motion of Saturn and Uranus), rather than just calendar days.
Walker himself responds to critics with a challenge: "If the Master Time Factor is nonsense, why does it produce turning points to the exact day, year after year, across seven different asset classes?" myles wilson walker wd ganns master time factor link
Walker’s link: When price advances in a ratio of 1:1 with this specific 90/144 harmonic, the Master Time Factor is "in sync." It is the identification of as the missing bridge