What are the latitude lines that mark the summer and winter solstice?

The latitude lines that mark the summer and winter solstices are the Tropic of Cancer and the Tropic of Capricorn. The Tropic of Cancer, located at approximately 23.5° North latitude, marks the position of the sun during the summer solstice in the Northern Hemisphere. Conversely, the Tropic of Capricorn, at approximately 23.5° South latitude, marks the position of the sun during the winter solstice in the Northern Hemisphere. These latitudes define the limits of the sun's zenith during these solstices.