[2] Biancani was one of the most able and respected Catholic astronomers of his day, and his main work, Sphaera Mundi, was republished at least four times in the seventeenth century, 1620, 1630, 1635, and 1653.

In his Sphaera mundi, Biancani expounded on his belief that God had made the Earth a perfect symmetrical world: the highest mountain on land had its proportional equivalent in the lowest depth of the ocean.

The original Earth emerged on the third day of Genesis creation narrative as a perfectly smooth sphere, Biancani reasoned.

Demonstrativa, ac facili Methodo tradita: In qua totius Mundi fabrica, una cum novis, Tychonis, Kepleri, Galilaei, aliorumque; Astronomorum adinventis continetur.

As evidenced in the table of contents, this work also presented a summary of the discoveries made with the telescope by Tycho Brahe, Johannes Kepler, Galileo, Copernicus, and others.

"But that this opinion [heliocentrism] is false," Biancani wrote, during his discussion on Copernican and Keplerian theories, "and should be rejected (even though it is established by better proofs and arguments) has nevertheless become much more certain in our day when it has been condemned by the authority of the Church as contrary to Sacred Scripture" (Sphaera, IV, 37).

Nevertheless, he remained ambivalent in the midst of the Scientific Revolution, as he cited Galileo's opinions on the surface of the Moon while also discussing those of the ancients, such as Posidonius and Cleomedes.

[14] Biancani's Constructio instrumenti ad horologia solaria discusses how to make a perfect sundial, with accompanying illustrations.