Time variation of the H|$_2$|O maser distribution around W Hya, which is found in the VERA astrometric observations. The dashed-line arrow indicates the proper motion of the central star estimated from the Gaia Data Release 2 (Gaia Collaboration 2018). The open ellipses indicate the estimated positions of the central star at a specific epoch of the VERA observation. The size of the ellipse indicates the position uncertainty. The light-grey filled ellipse indicates the appearance of the SiO maser ring on 2005 March 12, whose size is estimated from the SiO maser distribution found by Imai et al. (2010). (Color online)