A vector is a mathematical construct that has magnitude and direction. The cross product of two vectors is a binary operation in three-dimensional space that results in a third vector that is ...
In the present situation, both Earth and Mars are moving in the same direction around the Sun, but the slower one, Mars, appears to move backwards compared to the faster one, Earth. Just an illusion. The retrograde motion of Mars â like the apparent motion of the slower car on the highway â is nothing more than an illusion.
The danger of forward head posture and TMJ: The domino effect. 1  Moving forward, the head shifts the center of gravity. 2  To compensate, the upper body drifts backward. 3  To compensate for the upper body shift, the hips tilt forward.