The Isle of Gnomon is one of the Islands of Abarat, and lies at four in the afternoon.
In the books
Role in the Abarat
Role in Abarat: Days of Magic: Nights of War
Role in Abarat: Absolute Midnight
It is littered with temples and oracles all over the isle which tell of lost prophecies and ancient prayers sacred to the Abarat not to mention wandering ghosts.
It is once believed that Gnomon and the nearby isle of Soma Plume were once joined which helps solve a mystery towards the purpose of all the roads that lead nowhere on the island