Which name does C.S. Lewis give Earth in the Space Trilogy?

Thulcandra is the name C.S. Lewis gives Earth in the Space Trilogy.

In Lewis’s fictional interplanetary vocabulary, Thulcandra means the Silent Planet. Earth has become isolated from the wider community of intelligent worlds, which explains the title Out of the Silent Planet, the trilogy’s first novel. The name is presented through the language and perspective of extraterrestrial cultures.

The trilogy follows Elwin Ransom across several worlds. He travels to Malacandra, Lewis’s name for Mars, in Out of the Silent Planet, and to Perelandra, Lewis’s name for Venus, in the second novel. The different names help Lewis build a cosmology that is both science-fictional and theological.

Thulcandra is therefore not another character or kingdom. Glome belongs to the setting of Till We Have Faces, while Malacandra and Perelandra designate other planets in the Space Trilogy. Keeping those names distinct avoids one of the series’ most common geography mix-ups.