Cetus is a large constellation located in the southern sky, named after a sea monster in Greek mythology. It is one of the 88 modern constellations and is often depicted as a whale. Cetus contains several notable stars, including Beta Ceti, also known as Diphda, which is the brightest star in the constellation. In addition to its prominent stars, Cetus is home to various deep-sky objects, such as the Cetus A galaxy, which is a well-known radio galaxy. The constellation is best visible during the months of October to December, making it a popular target for stargazers and astronomers.