An old or variant spelling of geodesy; the science of measuring and mapping the earth's shape, size, and positions on its surface.
From Greek gē ('earth') + daisis (possibly related to division or measurement). This older form reflects historical Latin-influenced scientific nomenclature before standardization on 'geodesy.'
Medieval and Renaissance scientists used 'geodaesia' when 'geodesy' hadn't been standardized yet—tracking how terms evolve shows how science itself gets organized and made uniform across languages.
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