The June Solstice or Summer Solstice is the day with the longest period of sunlight in the year in the northern hemisphere. Usually, the Summer Solstice occurs between June 20th and June 22nd. This year in 2015, the Summer Solstice will occur on June 21st. In Canada, National Aboriginal Day coincides with the Summer Solstice. The solstice has special meaning to aboriginals and many aboriginal communities celebrate this day. In 1996, June 21st was marked as National Aboriginal Day. This day represents the unity of First Nations and is a day to celebrate native cultures.