With the days getting progressively longer and warmer in the Northern Hemisphere, summer may appear to be well under way. However, though the meteorological season began on June 1, 2019, the astronomical season will not start until June 21, 2019. Also known as the June solstice, it is the day when the North Pole is most inclined toward the sun, which means that everyone living north of the equator will experience the year's longest day and shortest night. For Southern Hemisphere residents, the date heralds the official start of winter, resulting in the shortest day and longest night of the year.