[operation clinton cleanup]

I could probably google it, but when did our planet start commonly being referred to as the Earth?

[PatrickHenry]

I could probably google it, but when did our planet start commonly being referred to as the Earth?

In lots of SF stories, where people are living on lots of planets, Earth is Terra, Latin like Luna and Sol. As for when "Earth" was first employed as the name of our planet, I'd be guessing. I suppose it also dates from after Galileo, when it was realized that what had been "the world" was just one of several planets. Interesting question. Maybe someone has a more authoritative answer than my speculations.

[Ichneumon]

I could probably google it, but when did our planet start commonly being referred to as the Earth?

It's also interesting to note that throughout history, the most common name that various groups of humans (i.e. various tribes, nations, etc.) would apply to themselves in their native language was, "the People".