maybe there’s a math pattern that points to a planet with a 370year orbit, which is why we haven’t seen it?
uranus is 14 times the mass of earth; orbit is 84 years
neptune is 17 times the mass of earth; orbit is 164 years (2x Uranus)
pluto is about 40% the mass of earth; orbit is 247 years (1.5x Neptune)
Planet Nine is 10 times the mass of earth; orbit is ??
If ?? is 1.5x then it’s 370 years. Then check the charts.
164
84 = 80 or 2.05x slower
247
164 = 83 or 1.5x slower
??
247 = 1.5x slower then ??=370, or slower.
For some time now, I've attributed the wobble in the ephemeri to an unexplained planetary body moving either in retrograde or more or less perpendicular to the ecliptic. Analogously, that's a description of Jupiter's moon system.