Kawaguchi, Jun'ichiro2026-01-012026-01-0197808770354110065-3438ORCID:/0000-0001-8196-5194/work/162948020https://hdl.handle.net/1885/733800570Usually, the formation flying associated with a circular orbit is discussed through the well-known Hill's equations of motion. This paper presents and discusses the formation-fixed coordinate to discuss about the formation behavior. The resulted equations take the non-autonomous form and will depict some interesting characteristics. The paper will also present the application of decentralized formation control strategy that stabilizes and enables a quick reaction to the command.6en200755849083969