Today Is the Longest Day of the Year. Here's What to Know About the 2018 Summer Solstice
While it’s already been hot for weeks, summer doesn’t officially start until the summer solstice, which falls on Thursday, June 21 this year.
The summer solstice, which 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.
Here’s everything you need to know about the 2018 summer solstice, including what it means and how Stonehenge is connected to the annual event.
What is the summer solstice?
While the calendar may say June 1 was the first day of summer, the season actually starts when the summer solstice happens, according to astronomers. That’s because meteorologists divide the year into four seasons based on weather patterns, so the summer solstice always occurs later than the first day of summer on the calendar.
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.
When is the 2018 summer solstice?
This year, the summer solstice officially starts at 6:07 a.m. E.T. on Thursday, June 21.
And while the summer solstice marks the start of the summer, the days are about to get shorter now because the sun is rising later and setting earlier.
