Autumnal Equinox: How Will Daylight Change in Your Zip Code?
The sun will cross the celestial equator at 8:05 p.m. EDT, and meteorological fall began Sept. 1, officials said.
- On Tuesday, Sept. 22, the autumnal equinox arrives at 8:05 p.m. EDT, marking the official start of astronomical fall in the Northern Hemisphere as the sun aligns directly over Earth's equator.
- AccuWeather meteorologist Peyton Simmers explains that meteorological fall began Sept. 1, while astronomical fall arrives with the equinox; meteorologists divide the year into four three-month seasons for statistical simplicity.
- Derived from Latin, the word equinox combines "aequus," meaning equal, and "nox," meaning night, reflecting the 24-hour window when Earth experiences roughly equal amounts of daylight and darkness.
- Following the equinox, daylight in the Northern Hemisphere will shrink daily until the winter solstice on Dec. 21, while cooler conditions spread across the United States later this month.
- Peak fall foliage will reach the Northeast in early October, though Simmers noted that some warmups may still occur across the southern and eastern United States before conditions fully cool.
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