The upcoming autumnal equinox will occur at 10:29 p.m. EDT on Monday (0229 Tuesday, Sept. 23 GMT), according to the National Weather Service (NWS) Forecast Office. In addition to the autumnal equinox in late September, the Earth undergoes the vernal, or spring, equinox in March; As the world turns, the sun's rays are refracted, or bent to make it look like the sun is above the horizon for a longer period of time, even though it is not, NWS officials said in a statement.
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