Summer and Winter Solstice
When the sun is south of the equator, it would be winter in the northern hemisphere.
Solstice:either of the two times of the year when the sun is at its greatest distance from the celestial equator .
"Solstices" ... June 21 and December 21.
winter
That's called a solstice.
a solstice is the day when the sun reaches its greatest distance north or south of the equator.
The points where the sun reaches the greatest distance north or south of the equator are called The Tropics of Cancer and Capricorn. At one time the sun was in those constellations when it reached those points. It has shifted due to precession of the poles. It will be back in them in about 20,000 years.
Summer and winter
That would be "Winter".
Those are the solstices, two per year, when the Sun is at maximum declination.
Those points on the map of the sky are the "solstices".
Those points on the map of the sky are the "solstices".