solstice
sol.stice \'sa:l-st*s, 'so-l-, 'so.l-\ n [ME, fr. OF, fr. L solstitium, fr. sol sun + status, pp. of (Xsistere to come to a stop, cause to stand; akin to L stare to stand - more at SOLAR, STAND 1: one of the two points on the ecliptic at which its distance from the cel estial equator is greatest and which is reached by the sun each year about June 22d and December 22d 2: the time of the sun's passing a solstice which occurs on June 22d to beg in summer in the northern hemisphere and on December 22d to begin winter in the northern hemisphere
Webster's English Dictionary