Censorinus was a Roman grammarian and miscellaneous writer.
From its grammatical form, Censorinus is presumably his cognomen, the shared surname of a branch of a Roman family (Latin: [[gens (Roman)|gens]]). The cognomen Latin: Censorinus would typically be used by those descended from, adopted by, or related by prominent marriage to someone who had held the office of censor. Censorinus's given name (Latin: [[praenomen]]) and family name (Latin: [[nomen (ancient Rome)|nomen]]) are unknown, although the Marcii Censorini were by far the most prominent family to use the cognomen. The author is sometimes distinguished as (Latin: Censorinus Grammaticus).
Little is known of Censorinus, although he lived during the 3rd century and apparently dedicated Latin: De Die Natali to his patron Quintus Caerellius as a birthday gift.
Censorinus was the author of a lost work Latin: De Accentibus as well as the surviving Latin: De Die Natali.[1]
Latin: De Die Natali (Latin for "On the Natal Day" or "On the Birthday") or Latin: Opusculum de Die Natali ("Little Work on the Birthday") was apparently written in 238 for the birthday of Censorinus's patron Quintus Caerellius. The contents are of a varied character: the natural history of man, the influence of the stars and genii, music, religious rites, astronomy, the doctrines of the Greek philosophers, and antiquarian subjects. The second part deals with chronological and mathematical questions, and has been of great service in determining the principal epochs of ancient history. The whole is full of curious and interesting information. The style is clear and concise, although somewhat rhetorical, and the —for the period—good. The chief authorities used were Varro and Suetonius. Some scholars, indeed, hold that the entire work is practically an adaptation of the lost Pratum of Suetonius. The fragments of a work De Naturali Institutione, dealing with astronomy, geometry, music, and versification, and usually printed with the De Die Natali of Censorinus, are not by him. Part of the original manuscript, containing the end of the genuine work, and the title and name of the author of the fragment are lost.
A bright crater in the Sea of Tranquility on the Moon has been named after him.