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LTC Stephen F.
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Thank you, my friend Maj William W. 'Bill' Price for posting the NASA Astronomy Picture of the Day for Thursday, January 9, 2020 entitled "Perihelion to Aphelion."
Image: Perihelion to Aphelion - Image Credit & Copyright - Ian Griffin (Otago Museum)
"Explanation: Perihelion for 2020, the point in Earth's elliptical orbit when it is closest to the Sun, occurred on January 5th. The distance from the Sun doesn't determine the seasons, though. Those are governed by the tilt of Earth's axis of rotation, so January is still winter in the north and summer in southern hemisphere. But it does mean that on January 5 the Sun was at its largest apparent size. This composite neatly compares two pictures of the Sun, both taken from planet Earth with the same telescope and camera. The left half was captured on the date of the 2020 perihelion. The right was recorded only a week before the July 4 date of the 2019 aphelion, the farthest point in Earth's orbit. Otherwise difficult to notice, the change in the Sun's apparent diameter between perihelion and aphelion amounts to a little over 3 percent. The 2020 perihelion and the preceding 2019 aphelion correspond to the closest and farthest perihelion and aphelion of the 21st century."

Gary Bartz - Perihelion And Aphelion
https://www.youtube.com/watch?v=FJiXZP8nnKU

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Lt Col Charlie Brown
Lt Col Charlie Brown
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Excellent information share LTC Stephen F. and thank you for the mention
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1SG Steven Imerman
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Cool picture, thanks. I had actually thought there would be more difference. By maximum aphelion, does that mean that was the largest apehelion (to our point of view) of the century, or the most aphelionish, meaning the smallest, to us?
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Maj William W. 'Bill' Price
Maj William W. 'Bill' Price
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1SG Steven Imerman Maximum perihelion: farthest from the Sun. Maximum aphelion: closest to the Sun.
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