Seeing at a Glance

Abstract

During the 17th century, the debate over the true world system (sistema mundi) was essentially between the heliocentric and geo-heliocentric models. Comparisons were made between tables that recorded more and more celestial observations in various printed astronomical works. Giovanni Battista Riccioli’s Almagestum novum (1651) provides an excellent example of how tables were used. Riccioli wanted to find the best hypothesis (hypothesis absoluta) with the help of a rigorous database from which he could proceed to make mathematical deductions. Tables in early modern astronomical books were important because they showed the results of observations. Presented in a clear way they became persuasive visual arguments.