Doesn't SE Know The Difference Between Planets and Stars?

[Ransu]

Like many things in FFXIV, its likely a reference to things from Greek history (Elpis, Metion, entelechy, dynamis, Pandaemonium, the names of the Ascians etc....are all references to Greek history/mythology). The earliest known references of the word planet come from Ancient Greek which was aster plenetes meaning "wandering stars."

NegativeS reasons could also play a part in it, but given all the references in the games story, I think it's more related to the former.

[Izar_Chillen]

Like many things in FFXIV, its likely a reference to things from Greek history

And Babylonian/Mesopotamian