That word is geocentric.
The median is the medical or anatomic term for the center of the body.
Its simply called the "center point" or "center". There is no fancy term for it.
core
Pitch
Medial means situated in the center.
The medical term meaning "conveying toward the center" is "centripetal." In anatomical contexts, it often refers to processes or structures that move inward toward the center of the body or an organ. This term is typically contrasted with "centrifugal," which refers to movement away from the center.
concentric
"nucleus"
"nucleus"
The term for moving from one key center to another within a composition is called modulation.
Earth's core
Focal point