10/31/2025
TIME TO FALL BACK ONE HOUR!!
Saturday evening, 11/01/2025, before you tuck into bed , if necessary, make the time change!
Summer has come to an end and Fall is in full swing. That means daylight saving time will soon draw to a close.
The The U.S. Naval Observatory's Astronomical Applications Department works on time measurement and maintaining standard time, contributing to the national time service and coordinating astronomical time scales. This year, the time change occurs on Sunday, Nov. 2.
The goal: better align our active hours with available daylight, reduce lighting demand, and give people more post-work daylight. The idea was simple: the government would extend evening daylight during longer-day months, potentially reducing lighting demand and giving people more post-work daylight. The concept came from wartime energy-saving measures taking place in countries across Europe.
Congress passed the Uniform Time Act of 1966 and in 2007, daylight saving time was extended again with energy efficiency in mind. Starting in March and ending in November.
Whether it actually saves energy today is debated, as lighting and technology have evolved. The tradeoffs remain: brighter evenings versus darker mornings. Supporters appreciate after-work daylight; critics cite sleep disruption, early-morning darkness for school buses, and unhealthy effects on circadian rhythm —the 24-hour biological cycles that regulate sleep and wake patterns. The term is derived from the Latin phrase “circa diem,” meaning “about a day,” referring to biological variations of a 24-hour cycle.
