Ptolemy or optical factors and those caused by judgmental factors. He offered an obscure explanation of the sun or moon illusion (the enlarged apparent size on the horizon) based on the difficulty of looking upwards. There are several characters or items named after Ptolemy, including: [[File:Ptolemaeus - Quadripartitum, 1622 - 4658973.tif|thumb|"Quadripartitum", 1622]] [[Category:Ptolemy| ]] [[Category:100 births]] [[Category:170 deaths]] [[Category:1st-century Romans]] [[Category:2nd-century Romans]] [[Category:2nd-century philosophers]] [[Category:2nd-century poets]] [[Category:Egyptian calendar]] [[Category:Ancient Greek astrologers]] [[Category:Ancient Greek astronomers]] [[Category:Ancient Greek mathematicians]] [[Category:Ancient Greek music theorists]] [[Category:Astrological writers]] [[Category:Claudii]] [[Category:Egyptian astronomers]] [[Category:Egyptian mathematicians]] [[Category:Epigrammatists of the Greek Anthology]] [[Category:2nd-century people of Roman Egypt]] [[Category:Ancient Greek geographers]]
Ptolemy of Mauretania and were among the younger grandchildren to Mark Antony. Through his maternal grandfather, Ptolemy was distantly related to Julius Caesar and the Julio-Claudian dynasty. Ptolemy was a first cousin to Germanicus and the Roman Emperor Claudius and a second cousin to the Emperor Caligula, the Empress Agrippina the Younger, the Empress Valeria Messalina and the Emperor Nero. Ptolemy was most probably born in Caesaria, the capital of the Kingdom of Mauretania (modern Cherchell, Algeria) in the Roman Empire. He was named in honor of his mother’s ancestors, in particular the Ptolemaic dynasty. He was also named in honor of the