solstice
/ˈsɔlstɪs; `sɑlstɪs/ n
either of the two times of the year at which the sun is furthest North or South of the equator 至日; 冬至或夏至
summer solstice, ie about 21 June in the Northern hemisphere 夏至
winter solstice, ie about 22 December in the Northern hemisphere 冬至. Cf 参看 equinox.