Galactic latitude position residuals of Sgr A* relative to J1745−283 from Fig. 4 on a finer scale. The dashed line is the variance‐weighted best‐fit proper motion of −﹩0.202\pm 0.019﹩ mas yr⁻¹, or −﹩7.6\pm 0.7﹩ km s⁻¹ for ﹩R_{0}=8.0﹩ kpc. The solid arrow indicates the apparent motion of Sgr A* expected for the 7.17 km s⁻¹ motion of the Sun perpendicular to the plane of the Galaxy. The slight tendency for data within a 1–2 week observing group to correlate suggests a small source of systemic error (≲0.2 mas) for data prior to 2003, probably from unmodeled atmospheric delays. Error bars are ±1 σ and include an estimate of this systematic uncertainty.