Editing Extremes on Earth (section)

====Along any diameter (straight line passing through the centre of the Earth)====
As distinct from geodesic lines, which appear straight only when projected onto the spheroidal surface of the Earth (i.e. arcs of great circles), [[Line (geometry)|straight lines]] passing through the Earth's centre can be constructed through the interior of the Earth between almost any two points on the surface of the Earth (some extreme topographical situations such as overhanging cliffs being the rare exceptions{{citation needed|date=August 2022}}). A line projected from the summit of [[Cayambe (volcano)|Cayambe]] in [[Ecuador]] (see [[#Highest_points|highest points]]) through the axial centre of the Earth to its [[antipodes|antipode]] on the island of [[Sumatra]] results in the longest [[diameter]] that can be produced anywhere through the Earth. As the variable circumference of the Earth approaches {{convert|25000|mi|order=flip}}, such a maximum "diameter" or "antipodal" line would be on the order of {{convert|8000|mi|order=flip}} long.{{citation needed|date=August 2022}}