Fait mathématique: 43003 is an uninteresting number.
Culture générale: 43003 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: September 26th is the day in 46 BC that Julius Caesar dedicates a temple to his mythical ancestor Venus Genetrix in accordance with a vow he made at the battle of Pharsalus.