The planet which Truman Bethurum claimed his alien visitors came from. Clarion is apparently hidden from the Earth on the opposite side of the sun.
(Messengers of Deception, 39)
Not to be confused with Planet Claire. For the love of all that is holy, do not mistake them.
References
- wiki: Counter-Earth
- wiki: B-52s – Planet_Claire
- wiki: Nemesis_(hypothetical_star)