A spherical fluid is floating in space. The fluid is uniform and isotropic. That is, gravity has no acting on the sphere.
The sphere will be in non-accelerated frame. It is moving in a uniform linear motion through space (or is at rest). However, if the sphere moves in a way other than the above, there will be a corresponding deviation from uniform isotropy. The difference between accelerated and non-accelerated frame is not fictitious.
