Orbit transfer using Theory of Functional Connections via change of variables Allan K. de Almeida Jr., Antonio F. B. A. Prado and Daniele Mortari Eur. Phys. J. Spec. Top., 232 18-19 (2023) 3161-3173 Published online: 22 December 2023 DOI: 10.1140/epjs/s11734-023-01013-1