Position residuals of Sgr A* relative to J1745−283 on the plane of the sky. Each measurement is indicated with an ellipse, approximating the apparent scatter‐broadened size of Sgr A* at 43 GHz and 1 σ error bars, which include estimates of systematic uncertainties. The dashed line is the variance‐weighted best‐fit proper motion, and the solid line gives the orientation of the Galactic plane, which is tilted by 31﹩\fdg﹩40 east of north in J2000.0 coordinates (see the Appendix).