solstice -
One of the two points in the ecliptic at which the sun is furthest from the celestial equator. This corresponds to one of two days in the year when the day is either longest or shortest.
Wikipedia
A solstice is an astronomical event that happens twice each year when the Sun's apparent position in the sky reaches its northernmost or southernmost extremes. The name is derived from the Latin sol (sun) and sistere (to stand still), because at the solstices, the Sun stands still in declination; that is, the apparent movement of the Sun's path north or south comes to a stop before reversing direction. The term solstice can also be used in a broader sense, as the date (day) when this occurs.
OmegaWiki Dictionary
Ω
solstice Either of the two events of the year when the sun is at its greatest distance from the equatorial plane.
