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An indentation in the edge of high ground on a planetary surface; pl.sinus. The name, which means ‘bay’, is not a geological term, but is used in the nomenclature of individual features, for example Sinus Iridum on the Moon. It is also used for a protrusion from a dark area in the naming of Martian albedo features, for example Sinus Meridiani.

Subjects: Earth Sciences and Geography — Astronomy and Astrophysics.

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