A pagan holiday and Wiccan Sabbat

June solstice, when the sun reaches the northernmost point of the sky.

December solstice, when the sun reaches the southernmost point of the sky

(astronomy) The moment when the sun reaches the northernmost point of the sky, occurring on June 20–22. That would be summer solstice in the northern hemisphere and winter solstice in the southern hemisphere.

(astronomy) The moment when the sun reaches the southernmost point of the sky, occurring on December 21–22. That would be winter solstice in the northern hemisphere and summer solstice in the southern hemisphere.