Where Is the 'Middle of the World'? Geographic, Cultural, and Conceptual Centers

Multiple Interpretations

1. Geocenter – Earth's geometric center (~6,378 km below surface).
2. Center of Mass (Barycenter) – Slightly offset from geocenter due to density variations; also deep underground.
3. Equator – Latitude 0°; divides Northern/Southern Hemispheres; widest circumference.
4. Prime Meridian – Longitude 0°; runs through Greenwich, UK; reference for time zones.
5. Landmass Centroid – Calculated center of all land areas; proposed points in Pacific Ocean.
6. Symbolic/Cultural Centers – Jerusalem, Delphi, Mount Kailash, etc., per various traditions.

There is no single physical "middle"; the concept is symbolic or frame-dependent.