* The title is inaccurate or a mistranslation: The actual title might be something else entirely, and "Sun of Perfection" is a descriptive phrase or an approximation.
* The book is obscure or lost: Many ancient texts have been lost or are only known through fragments.
* It's a modern work with a Latin title: The book might be a more recent creation using a Latin title that evokes a sense of antiquity.
To find information on a specific book, you need to provide more details, such as the author's name, approximate date of writing, or any other identifying information.