Posted on Jan 9, 2020
APOD: 2020 January 9 - Perihelion to Aphelion
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Edited 5 y ago
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Gary Bartz - Perihelion And Aphelion
"Another Earth", 1969.
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
FYI COL Mikel J. Burroughs LTC Ivan Raiklin, Esq. SFC William Farrell SSgt Robert Marx SSgt (Join to see) TSgt Joe C. SGT John " Mac " McConnell SP5 Mark Kuzinski Maj Marty Hogan PO1 William "Chip" Nagel SP5 Robert Ruck SCPO Morris Ramsey SPC Margaret Higgins LTC Wayne Brandon LTC Bill Koski Maj Bill Smith, Ph.D. MSG Andrew White SPC Tom DeSmet SGT Charles H. Hawes
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
FYI COL Mikel J. Burroughs LTC Ivan Raiklin, Esq. SFC William Farrell SSgt Robert Marx SSgt (Join to see) TSgt Joe C. SGT John " Mac " McConnell SP5 Mark Kuzinski Maj Marty Hogan PO1 William "Chip" Nagel SP5 Robert Ruck SCPO Morris Ramsey SPC Margaret Higgins LTC Wayne Brandon LTC Bill Koski Maj Bill Smith, Ph.D. MSG Andrew White SPC Tom DeSmet SGT Charles H. Hawes
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LTC Stephen F.
FYI SGT (Join to see) SSG David Andrews TSgt David L.PO1 Robert GeorgeSSG Robert Mark Odom
SP5 Jesse EngelSPC Matthew LambSSG Robert "Rob" WentworthPO2 Roger LafarletteSPC Nancy Greene
SSG Franklin Briant1stsgt Glenn Brackin
SP5 Jesse EngelSPC Matthew LambSSG Robert "Rob" WentworthPO2 Roger LafarletteSPC Nancy Greene
SSG Franklin Briant1stsgt Glenn Brackin
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Learned something new today and good morning Maj William W. 'Bill' Price
LTC Stephen F. SP5 Mark Kuzinski COL Mikel J. Burroughs SMSgt Lawrence McCarter Maj William W. 'Bill' Price SPC Margaret HigginsMaj Bill Smith, Ph.D. SGT Steve McFarlandLTC (Join to see) PO3 Craig Phillips Lt Col Charlie Brown SSG Michael Noll PO1 H Gene Lawrence TSgt Joe C. Lt Col John (Jack) Christensen Sgt (Join to see) SFC Joe S. Davis Jr., MSM, DSL SSG Donald H "Don" Bates Cpl (Join to see) PVT Mark Zehner
LTC Stephen F. SP5 Mark Kuzinski COL Mikel J. Burroughs SMSgt Lawrence McCarter Maj William W. 'Bill' Price SPC Margaret HigginsMaj Bill Smith, Ph.D. SGT Steve McFarlandLTC (Join to see) PO3 Craig Phillips Lt Col Charlie Brown SSG Michael Noll PO1 H Gene Lawrence TSgt Joe C. Lt Col John (Jack) Christensen Sgt (Join to see) SFC Joe S. Davis Jr., MSM, DSL SSG Donald H "Don" Bates Cpl (Join to see) PVT Mark Zehner
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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
1SG Steven Imerman Maximum perihelion: farthest from the Sun. Maximum aphelion: closest to the Sun.
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