Phobos and Deimos, the two moons of Mars, were discovered at the old Naval Observatory in Washington, D.C.'s Foggy Bottom neighborhood. Today, however, the Naval Observatory is best known as the residence of what figure?

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1. Phobos and Deimos, the two moons of Mars, were discovered at the old Naval Observatory in Washington, D.C.'s Foggy Bottom neighborhood. Today, however, the Naval Observatory is best known as the residence of what figure?