E. M. Antoniadi

Eugène Michel Antoniadi was a Greek-French astronomer. He is known for creating the Antoniadi scale as well as for his observations of the planets, and was a major opponent of the notion of Martian canals. He created some of the most detailed maps of Mars at the time, and many features on the planet are still known by the names he suggested. He also created the first map of Mercury, though it turned out to be incorrect.