Which 1651 Riccioli book assessed many arguments about Earth's motion?
Answer
Almagestum Novum
Answer
Almagestum Novum
The 1651 Riccioli book that assessed many arguments about Earth’s motion is Almagestum Novum.
Written by the Italian Jesuit astronomer Giovanni Battista Riccioli, Almagestum Novum means “New Almagest.” Published in Bologna in 1651, it was a massive encyclopedic astronomical work containing observations, tables, diagrams, and discussions of competing cosmological systems.
Its Book 9 examined whether Earth moves and whether the universe should be understood through a Copernican, Tychonic, or other arrangement. Riccioli organized 126 arguments concerning Earth’s motion: 49 presented in favor and 77 against. Although he argued against Copernicanism and favored a geo-heliocentric alternative, he treated the competing arguments in considerable detail and acknowledged that some anti-Copernican objections failed.
The title deliberately recalls Ptolemy’s Almagest, represented by the option Syntaxis Mathematica, which is a title associated with Ptolemy’s ancient work. Tabulae Rudolphinae was Kepler’s 1627 set of astronomical tables, while Epitome Almagesti is a different kind of astronomical summary.
Source: Wikipedia · fact-checked Sept. 2026