Which 1610 book announced Galileo's telescopic discoveries that challenged geocentrism?

Sidereus Nuncius was the 1610 book in which Galileo announced telescopic discoveries that challenged geocentrism.

Published in Venice on March 13, 1610, Sidereus Nuncius—usually translated as The Starry Messenger—was Galileo Galilei’s short astronomical treatise. It reported observations made with an improved telescope, including the Moon’s rugged surface, many stars invisible to the naked eye, and four bodies circling Jupiter.

The Jupiter observations were especially damaging to strict geocentrism because they showed that celestial bodies could orbit something other than Earth. Galileo’s lunar observations also challenged the traditional idea that the heavens were made of perfect, unchanging spheres. The book therefore reshaped debates about the structure of the cosmos, even though it did not explicitly set out a complete defense of Copernican heliocentrism.

Astronomia nova was Johannes Kepler’s 1609 work on planetary motion, while the Almagestum novum and Epitome Astronomiae Copernicanae were later works by other astronomers. None is the correct title here.