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Title: Combination pocket sundial and perpetual calendar by Johann [Go to resource]
Description: Combination pocket sundial and perpetual calendar by Johann Martin, Augsburg, in case. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: crescent equinoctial sundial
perpetual calendarTemporal: 1671-1720 Source: Science Museum Creator: Martin, Johann Identifier: 1943-20 Go to resource More Like this...
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