n.either of the two times of the year when the sun is at its greatest distance from the celestial equator

Solstices
Solstices at the Hardknott Roman Fort
Solstices, Equinoxes, and the Presocratics
Solstices and Equinoxes in Babylonian Astronomy during the Seleucid Period
On seeding equatorial spread F during solstices
High frequency spectral occupancy at the solstices
Roman Towns Oriented to Sunrise and Sunset on Solstices
Hemispherical asymmetry in cusp precipitation near solstices
Disintegration of the ionospheric Sq Loop system during winter solstices along 75 deg E longitude
Comparative terrestrial planet thermospheres: 3. Solar cycle variation of global structure and winds at solstices