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Discus in plano. Sonnenuhr discus in plano nach Vitruv de Ireas CommonsHelper br Original text Abb aus Ren Rohr Die Sonnenuhr' Nov gescant und hochgeladen von Dr Ing Wetzel alias Analemma Zeichnung aus Francesco Peter Di un antico orologoio solare Rom PDold Original upload log page de Discusinplano Analemma bytes no Information