Fall Equinox 2017

Happy Equinox! Here’s how quickly the days are getting shorter where you live.

Sept. 22 marks the fall equinox, ushering in the year’s best season on a day that lasts almost exactly 12 hours no matter where you are on the globe.

Many of us in the Northern Hemisphere start noticing the days get shorter right about now, although in truth this has been happening for months — ever since June 21, the year’s longest day.

But for most of us, the speed at which the daylight is dying is faster now than at any other time of the year. Check out the chart below, which plots the length of daylight versus the months of the year for Washington. I’ve adapted it from a nifty tool created by the University of Nebraska at Lincoln’s astronomy department.

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