Backwards prediction of the GRAVITY data for S29_GRAVITY leads to a position in March 2007 compatible with the position of S29_NACO. The black points show the GRAVITY data from 2021 and 2019. The set of black orbits is obtained by bootstrapping these data and fitting each of these mock data sets. The family of orbits naturally matches the position obtained from NACO (orange disk). The epoch March 2007 was chosen since it is the one used in Gillessen et al. (2009) to define the names of the S-stars.