"The First City is on Kronos."
Translation:Qo'noSDaq 'oH veng wa'DIch'e'.
As kahless62003 has explained, we've never been given a rule, but the tendency seems to be that -taH is only used on the pronoun-as-verb for things that are currently in a location, but expected to move and it is not used for things that are expected to always be in the same location. However, I must admit that we have not always been consistent in this course. Please feel free to report any sentences that do not seem to match the established pattern.