The Great Comet is a comet that appears extraordinarily bright and spectacular, especially through a tail that is clearly visible to the naked eye. A large comet is a comet that becomes particularly brightest. While comets are named after their discoverers, some are called - the great comet of ... followed by the year in which they shone. The definition of a large comet is partly subjective. However, those who by their brightness reach the public opinion and those not well versed in astronomy acquire the badge of great comet.