The dark mornings and low temperatures in the Northern Hemisphere may lead one to think that winter is well on its way. However, the astronomical start of the chilly season will not be until December 21, 2020. Called the winter solstice, it is the point in time when the Northern Hemisphere is farthest away from the sun, resulting in less sunlight to the region this year. 2020's longest night will coincide with two exciting celestial events — the peak of the Ursids meteor shower and a "great conjunction" of the solar system's two largest planets, Jupiter and Saturn.