Abstract
Abstract This article presents an edition and brief analysis of the previously overlooked text De compositione quadrae, which is transmitted as part of a scientific miscellany assembled at Worcester Cathedral Priory no later than 1140. De compositione quadrae offers hitherto unavailable information on the construction of the so-called quadrans vetustissimus, a version of the universal horary quadrant circulating in Latin Europe during the eleventh and twelfth centuries. It is particularly noteworthy for its description of a graphical method of inscribing the months of the Julian calendar on the quadrant’s cursor, which successfully approximates the sine function that determines the change of solar declination in the course of a year.
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