Ars Astronomica is a scholarly imprint issuing the first English translations of rare Hebrew and Latin works in astronomy, cosmology, and natural philosophy. Many of these texts have never appeared in English before, and some survive only as manuscripts. Notably, Gersonides’ 136‑chapter mathematical astronomy treatise, composed around 1328, was never printed and exists solely in manuscript form.

Among the translated titles are Athanasius Kircher’s *Mundus Subterraneus* (1665), a vast attempt to explain the hidden world beneath our feet, and David Gans’s *Nechmad ve‑Na’im* (c. 1613), a Hebrew textbook that presents the Ptolemaic model while incorporating contemporary European science. Also included are Gans’s historical chronicle *Tzemach David*, Jacob ben Samson’s commentary on the “secret of the calendar,” and Joseph Delmedigo’s scientific compendium *Sefer Elim*.

Further works cover the Tychonic system: Longomontanus’s *Astronomia Danica* and Pierre Gassendi’s biography of Tycho Brahe, which details Brahe’s observatory on Hven and his observational program. Riccioli’s *Astronomia Reformata* offers a mature reckoning with the heavens as the telescope transformed observational astronomy, building on his earlier *Almagestum Novum*.

By making these diverse sources available in a single language, Ars Astronomica enables scholars to read and compare medieval Hebrew and Latin astronomy side by side for the first time, revealing how the texts cite and answer one another across centuries and traditions.