APOD: 2021 September 22 - Equinox on a Spinning Earth

Thank you my space-exploration and NASA photography advocate friend Maj William W. 'Bill' Price for posting the NASA Astronomy Video Clip of the Day (AVCOD) for Wednesday, September 22, 2021 entitled "Equinox on a Spinning Earth."
This video from March 2011 which captured the equinox is a nice historical video.

Image: 2021-09-22 solstices and equinoxes for 2021.


APVCOD background
"Explanation: When does the line between night and day become vertical? Today. Today is an equinox on planet Earth, a time of year when day and night are most nearly equal. At an equinox, the Earth's terminator -- the dividing line between day and night -- becomes vertical and connects the north and south poles. The featured time-lapse video demonstrates this by displaying an entire year on planet Earth in twelve seconds. From geosynchronous orbit, the Meteosat 9 satellite recorded these infrared images of the Earth every day at the same local time. The video started at the September 2010 equinox with the terminator line being vertical. As the Earth revolved around the Sun, the terminator was seen to tilt in a way that provides less daily sunlight to the northern hemisphere, causing winter in the north. As the year progressed, the March 2011 equinox arrived halfway through the video, followed by the terminator tilting the other way, causing winter in the southern hemisphere -- and summer in the north. The captured year ends again with the September equinox, concluding another of billions of trips the Earth has taken -- and will take -- around the Sun.'

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I guess most of us knew that is what happens over the course of a year, but it is really interesting to see it on a time lapse video for one full orbit around Our Sun...and in 12 seconds yet!!! Love the post, Maj William W. 'Bill' Price!!!

Too funny, and very cool.