solstice

Definitions

General Science

  • noun one of the two times of year when the Sun is at its furthest point, either north or south, from the equator

Astronomy

  • Times of the year when the Sun is at its southernmost and northernmost points on the ecliptic, called respectively – with no deference to southern hemisphere residents – the summer and winter solstice. They fall on about June 21 and December 22 respectively.
http://www.dictionarycentral.com/definition/solstice.html