For those of you who, like I, live in the northern hemisphere welcome to summer. Yesterday was the northern Summer Solstice. Because of the tilt of the Earth on its axis there are two summer solstices each year. The southern Summer Solstice, which is when the South Pole is closest to the Sun, and the northern Summer Solstice, when the North Pole is closest to the Sun. The Summer Solstice is the longest day of the year and it traditionally marks the beginning of Summer.