Perelandra was created in 1943.

Perelandra is the name for the planet Venus in the Out of the Silent Planet trilogy by C. S. Lewis. This is a science-fiction trilogy, but like the children's series which he wrote, Chronicles of Narnia, it is basically Christian allegory. The first novel, Out of the Silent Planet, takes place on Mars, the second, Perelandra or Voyage to Venus, takes place on Venus, and the last one, That Hideous Strength, takes place on Earth, the silent planet.
Orb would refer to the planet itself.

The space trilogy, written by C.S. Lewis, was published between 1938 and 1945, with each book being released in different years (Out of the Silent Planet in 1938, Perelandra in 1943, and That Hideous Strength in 1945).

C.S. Lewis wrote The Chronicles of Narnia.

He also wrote a short series of three books known as the Space Trilogy: Out of the Silent Planet, Perelandra (aka Voyage to Venus), and That Hideous Strength.