As it comes into a Solar System it falls in to the gravity well of the Sun, The Sun slows it down (Gravity repulsion) and it go under the Sun's South pole as it go under the Planet North pole points at the Sun's South pole the whole time as it swings by.
Then as it is only propelled by what is left in it's forward movement. as it go though the equinox it is fighting a lot of energy that returns to the Sun in that area the North and South poles are standing, but it is now peeking up though the upper half of the equinox and some times the Sun pulls on the South Pole of The Planet forcing the North pole in toward Earth's North pole causing the EQ's in the ring of fire! It is Moving Slowly but will Quicken when it pulls above the Equinox the the Sun's Repulsion will force it out as it is to Big to that close to the Sun!

Icom