|MadSci Network: Astronomy|
Hi Sally, I hope this answer is not disappointing to you, since your question suggests that there is only one planet, that sometime in the past, went by a different name. In reality, all of the planets have multiple names. This makes sense for many reasons. There are many languages spoken by people both now and in the past. For this very reason every planet has multiple names, depending on the language, and also how the current language may have derived from ancient languages. Jupiter, for example, is called Zeus by the Greeks and Giove by the Italians. Earth is Terra in Latin, and derivations of Terra within Western Europe. The Greeks call it Gaea. I've attached a web link that shows all of the different names of the planets, the Earths moon and the sun within many of the common and ancient languages that are spoken. I hope this helps! Doug http://www.nineplanets.org/days.html
Try the links in the MadSci Library for more information on Astronomy.