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At 2 a.m. on the second Sunday in March, we set our clocks forward one hour ahead of Standard Time (Spring forward, even though Spring doesn't begin until late March, over a week after the start of Daylight Saving Time).
View full size image. The seasons will change this Sunday (Sept. 22), with the Northern Hemisphere moving into autumn and the South emerging from winter into spring. The celestial event that marks this transition is called an equinox, and it happens twice every year, around March 21 and Sept. 21.