Today, June 20, happens to be the first day of summer or summer "solstice." Derived from the Latin words "sol" for "sun" and "sisto" for "stop," it is the day when the North Pole is most inclined towards the sun. As a result, residents of the Northern Hemisphere enjoy the longest day of the year. The opposite, of course, is true for the residents of the Southern Hemisphere who will experience the shortest day of the year. What makes today's summer solstice even more unique is that for the first time in many years, it coincides with a full moon.