In Gall projections, parallels are projected from which point on the equator to any meridian?

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Multiple Choice

In Gall projections, parallels are projected from which point on the equator to any meridian?

In a Gall projection, each parallel (latitude line) is formed by projecting from a single fixed point on the equator toward all meridians. The standard choice for that projection center is the antipodal point on the equator—the point opposite the central meridian. This equatorial antipodal center gives the symmetric, equal‑area behavior that characterizes Gall projections and keeps the latitude curves consistently related to the meridians. Choosing any other point on the equator would break that symmetry and alter how areas are represented, while points not on the surface (like the center of the Earth) or on other non-antipodal positions wouldn’t serve as a valid projection center for this construction.

In a Gall projection, each parallel (latitude line) is formed by projecting from a single fixed point on the equator toward all meridians. The standard choice for that projection center is the antipodal point on the equator—the point opposite the central meridian. This equatorial antipodal center gives the symmetric, equal‑area behavior that characterizes Gall projections and keeps the latitude curves consistently related to the meridians.

Choosing any other point on the equator would break that symmetry and alter how areas are represented, while points not on the surface (like the center of the Earth) or on other non-antipodal positions wouldn’t serve as a valid projection center for this construction.

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