Astronomy books are found in the QB call number range.
These call numbers are found on the 3d floor of the Guerrieri Academic Commons building.
If you find a physical book, it will have something called a call number. The call number is like its home address. Copy and paste any call number into the Call Number Locator below to see where it lives in the library.
A call number will look something like this:
SF408.3 .E84 1995