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“Sūrya-Siddhānta iii builds working astronomy from a gnomon: on a leveled surface, a drawn circle and a twelve-digit vertical stick yield the cardinal directions (from the shadow-tip's morning and evening crossings), the observer's latitude (equinoctial noon shadow, iii.17), and time-of-day quantities. Burgess's commentary works the rules for Washington, D.C. and gets its latitude right. The gnomon procedures are the observational ground floor of the siddhānta's parameter system. ”