Happy Equinox! Heres how quickly the days are getting shorter where you live.

I wish you all a happy harvest season.



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


https://www.washingtonpost.com/news/wonk/wp/2017/09/21/happy-equinox-heres-how-quickly-the-days-are-getting-shorter-where-you-live/?deferJs=true&outputType=default-article&tid=sm_tw&utm_term=.62f2570db0e1


By Christopher Ingraham September 21 at 6:00 AM

This photo of sunset over the southern part of the Atlantic Ocean was taken from the International Space Station. (Johnson Space Center/NASA)

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.


Plotted over a year (in this case, from March to March), the length of daylight looks like one of our old friends from trigonometry class — the sine curve. It peaks on June 21 — when daylight hours are longest — and bottoms out on Dec. 21.

The height and depth of the curve vary by a location's latitude — how far north it is. In places close to the equator, such as Quito, Ecuador, the curve essentially flattens out to a straight line because days last roughly 12 hours all year long. Farther north in places such as Juneau, Alaska, the curve gets very steep — days are extremely long in the summer and extremely short in the winter.

Even farther north — above the Arctic Circle, in towns such as Barrow, Alaska — the curve gets blown out completely. The sun never sets for part of the summer, and it never rises in the depths of winter....................

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