solstice
solar event
winter solstice
astronomical phenomenon that occurs in December in Northern Hemisphere and in June in Southern Hemisphere
December solstice
solstice that occurs each December (winter solstice in Northern Hemisphere and summer solstice in Southern Hemisphere)
June solstice
solstice that occurs each June (summer solstice in Northern Hemisphere and winter solstice in Southern Hemisphere)
summer solstice
astronomical phenomenon that occurs in June in Northern Hemisphere and in December in Southern Hemisphere