June 21, the long awaited, longest day of the year.
The Summer Solstice, is the longest day of the year, officially starts Thursday morning in the Northern Hemisphere. During the summer solstice, the sun appears to stand still as it reaches its highest point, before moving off toward the horizon.
The summer solstice begins when the tilt of Earth’s axis is most inclined towards the sun directly above the Tropic of Cancer. The Winter Solstice, which falls on Friday, Dec. 21 this year, is the exact opposite — when the earth’s axis tilted furthest away from the sun, marking the start of winter.
The summer solstice happens every year between June 20 and June 22 when the sun reaches its highest elevation in the Northern Hemisphere, making it the longest day of the year with a stretch of sunlight that lasts for 17 hours.
The term solstice derives from Latin word “sol” meaning “sun” and “sistere” which means “to make stand, ” according Dictionary.com