Equatorial coordinate system
type: Concept
narrower: Solstice

Summer solstice
type: Concept
broader: Solstice

Winter solstice
type: Concept
broader: Solstice

Solstice
narrower: Winter solstice
narrower: Summer solstice
modified: 2020-11-19T16:01:46.581Z
modified: 2020-11-19T16:01:56.751Z
type: Concept
contributor: AAS Frey.Katie
broader: Equatorial coordinate system
definition: Either of the two points on the ecliptic at which the apparent longitude of the Sun is 90° or 270°. Also the time at which the Sun is at either point. Solstices occur when the Earth's axis is oriented directly toward or away from the Sun, causing the Sun to reach its northernmost and southernmost extremes.