Sigma

Summary
Abbreviated designation: TS4[m].

A habitable moon of the large rocky planet Tau Sigma 4, the moon is known to its inhabitants simply as Sigma.

Only one continent on its surface is known to be inhabited - Arsatum. Human habitation on this continent is centred in and around the Hablands.

Similarities to Earth
Though it is a different star, the sun that shines on Sigma is yellow, and the planetoid's parent planet (Tau Sigma IV) sits in an orbit which gives Sigma a similar climate to that on Earth.

The compass points are inherited from Earth - the direction in which the sun rises is still known as East, and that in which it sets, as West.