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FixedRotation {}
is the SSC directive which prevents rotation. However, you also have to consider what coordinate system it's not rotating in -- its BodyFrame, in Celestia's parlance.
e.g.
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"spaceship" "star/planet/starbase"
{
Class "spacecraft"
Radius 0.17
Mesh "spacecraft.cmod"
NormalizeMesh false
MeshScale 0.001 # 1 unit = 1 meter
OrbitFrame { BodyFixed { Center "star/planet/starbase/dock12" }}
FixedPosition [ 0 0 0.5]
BodyFrame { BodyFixed { Center "star/planet/starbase/dock12" }}
FixedRotation {
Inclination 180
}
Albedo 0.001
}