Equatorsuch

Equatorsuch is a term used to describe a boundary, line, or feature that is analogous in function or position to an equator, but applied in contexts beyond Earth's geometry. It is not an established term in geography or mathematics; its meaning varies by discipline and author.

In geometry or planetary science, equatorsuch can denote a great circle on a sphere that partitions the surface into two regions of equal area, effectively mirroring the role of Earth's equator as a geographic divider. In other uses, it may refer to any imaginary line that splits a space or dataset into two halves of equal measure, such as an equal-area or equal-probability boundary in a spherical coordinate system or a data visualization.

The word blends equator with such, signaling that the object is 'of the kind of equator' without asserting literal latitude. As a coined term, it appears primarily in speculative writing, conceptual discussions, or domain-specific jargon, and it lacks a formal, universally accepted definition.

Examples of conceptually similar uses include: an equatorsuch that marks points equidistant from two poles; an equatorsuch in climate models demarcating hemispheric regimes; or a reference line in 3D rendering that divides a sphere into two equal halves.

See also: equator, great circle, meridian, boundary, equal-area projection.