These correspond to the solstices: winter and summer solstice, to be precise. As it stands, the earliest sunrise occurs before the June solstice and the latest sunset occurs after the June solstice. As Santa experiences the summer solstice, the Sun will continuously appear, today, at a height of 23.5° above the horizon. This one is actually very specific to Earth: the hottest times of the year typically correspond to approximately 6 weeks after the summer solstice, and approximately 6 weeks after the winter solstice. In 2004, SpaceShipOne completed its maiden suborbital space flight on the summer solstice: June 21.

Source: Forbes June 21, 2019 06:00 UTC