Why America Still Changes Clocks for Daylight Saving Time
Every year, most Americans adjust their clocks twice, except those in Hawaii and Arizona. This practice happens because of the changing length of daylight throughout the year.
When and How the Change Happens
Clocks are set back one hour on Sunday, November 2, at 1 a.m. This event is known as "falling back." People typically change their clocks before going to bed on Saturday night.
Shortening Daylight Hours
Since the Summer Solstice, the daylight hours have been gradually shrinking. By early November, the sun in San Diego will set as early as 4:56 p.m., and sunrise will be at 6:07 a.m., according to the National Oceanic and Atmospheric Administration (NOAA).
Approaching the Shortest Day
Daylight continues to diminish, reaching its lowest point on December 21, the Winter Solstice. On this day, the sun sets as early as 4:47 p.m., marking the shortest day and the longest night of the year.
Additional Notes
On Thanksgiving Day, November 27, the sun will set early at 4:43 p.m. and the consumption of large amounts of carbohydrates may encourage a deep sleep, reflecting the season's early darkness.
"This tradition is known as the time change in which we 'fall back' and generally set our clocks before bed on Saturday."
"That day [December 21] is also known as the shortest day and the longest night of the year."
Author’s summary: Daylight saving time remains in place to adjust for shrinking daylight hours each year, with clocks set back in November to maximize morning light as winter darkness approaches.