sun orbits earth

[Achebe]

Centrifugal force is fictitious?

Yeah, because the acceleration vector is towards the centre, so the centripetal force is the actual force.
What we experience as he centrifugal force is the tension of a string that we are supplying (tenjlsm not seeing) or the reaction force of our seats in a merry go round or simply the inability of friction to provide the necessary centripetal force causing a car to skid...