Kawaguchi, Jun'ichiroFunase, Ryu2026-01-012026-01-0197808770354350065-3438ORCID:/0000-0001-8196-5194/work/162948015https://hdl.handle.net/1885/733800577Usually, the formation flying associated with circular orbits is discussed through the well-known Hill's or C-W equations of motion. This paper dares to present and discuss the coordinates that may contain time-varying coefficients. The discussion presents how the controller's performance is affected by the selection of coordinates, and also looks at the special coordinate suitable for designating a target bin to which each spacecraft in the formation has only to be guided. It is revealed that the latter strategy may incorporate the J2 disturbance automatically.10en200860349098447