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Good morning RP. Today's Astronomy Picture of the Day (APOD) is titled "HDR: Earth's Circular Shadow on the Moon." High dynamic range (HDR) is used to reproduce a greater dynamic range of luminosity in an image than is possible with standard photographic techniques. This composite of last week's partial lunar eclipse combines 15 images and include an exposure as short as 1/400th of a second -- so as not to overexpose the brightest part -- and an exposure that lasted five seconds -- to bring up the dimmest part. Pretty neat trick, don't you think?
Astronomy Picture of the Day
Posted from apod.nasa.gov
NASA
Space
Science
Photography
Astronomy
Posted >1 y ago
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Thank you my friend Maj William W. 'Bill' Price for posting the Astronomy Picture of the Day (APOD) for Monday, July 22, 2019 entitled "HDR: Earth's Circular Shadow on the Moon."
Image: HDR - Earth's Circular Shadow on the Moon - Image Credit & Copyright - Cristian Fattinnanzi
"Explanation: What could create such a large circular shadow on the Moon? The Earth. Last week's full Moon -- the Buck Moon -- was so full that it fell almost exactly in a line with the Sun and the Earth. When that happens the Earth casts its shadow onto the Moon. The circularity of the Earth's shadow on the Moon was commented on by Aristotle and so has been noticed since at least the 4th century BC. What's new is humanity's ability to record this shadow with such high dynamic range (HDR). The featured HDR composite of last week's partial lunar eclipse combines 15 images and include an exposure as short as 1/400th of a second -- so as not to overexpose the brightest part -- and an exposure that lasted five seconds -- to bring up the dimmest part. This dimmest part -- inside Earth's umbra -- is not completely dark because some light is refracted through the Earth's atmosphere onto the Moon. A total lunar eclipse will occur next in 2021 May."
Thank you, my friend Maj Marty Hogan for mentioning me.
FYI Maj Robert Thornton Lt Col John (Jack) Christensen SP5 Jeannie Carle SP5 Mark Kuzinski SGT Mark Rhodes SGT Mark Anderson
COL Mikel J. Burroughs LTC Orlando Illi Maj Bill Smith, Ph.D. Maj William W. 'Bill' Price CPT Jack Durish Capt Tom Brown PO1 William "Chip" Nagel Capt Dwayne Conyers
Image: HDR - Earth's Circular Shadow on the Moon - Image Credit & Copyright - Cristian Fattinnanzi
"Explanation: What could create such a large circular shadow on the Moon? The Earth. Last week's full Moon -- the Buck Moon -- was so full that it fell almost exactly in a line with the Sun and the Earth. When that happens the Earth casts its shadow onto the Moon. The circularity of the Earth's shadow on the Moon was commented on by Aristotle and so has been noticed since at least the 4th century BC. What's new is humanity's ability to record this shadow with such high dynamic range (HDR). The featured HDR composite of last week's partial lunar eclipse combines 15 images and include an exposure as short as 1/400th of a second -- so as not to overexpose the brightest part -- and an exposure that lasted five seconds -- to bring up the dimmest part. This dimmest part -- inside Earth's umbra -- is not completely dark because some light is refracted through the Earth's atmosphere onto the Moon. A total lunar eclipse will occur next in 2021 May."
Thank you, my friend Maj Marty Hogan for mentioning me.
FYI Maj Robert Thornton Lt Col John (Jack) Christensen SP5 Jeannie Carle SP5 Mark Kuzinski SGT Mark Rhodes SGT Mark Anderson
COL Mikel J. Burroughs LTC Orlando Illi Maj Bill Smith, Ph.D. Maj William W. 'Bill' Price CPT Jack Durish Capt Tom Brown PO1 William "Chip" Nagel Capt Dwayne Conyers
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LTC Stephen F.
FYI LTC Wayne Brandon LTC (Join to see) Lt Col John (Jack) Christensen Maj Bill Smith, Ph.D. Maj Robert Thornton CPT Scott Sharon SSG William Jones SSG Donald H "Don" Bates PO3 William Hetrick PO3 Lynn Spalding SPC Mark Huddleston SGT Rick Colburn CPL Dave Hoover SSgt Brian Brakke SP5 Jeannie Carle SCPO Morris Ramsey Sgt Albert Castro
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Very neat trick- morning Maj William W. 'Bill' Price
LTC Stephen F. SP5 Mark Kuzinski COL Mikel J. Burroughs SMSgt Lawrence McCarter Maj William W. 'Bill' PriceCPL Dave Hoover SSG William Jones Sgt Vance Bonds Cpl (Join to see) PO1 H Gene Lawrence Maj Robert Thornton PO3 Bob McCord SPC Douglas Bolton Lt Col Charlie Brown TSgt Joe C. PO3 Craig Phillips CW5 Jack Cardwell SFC Joe S. Davis Jr., MSM, DSL SGT Mark Anderson SPC Margaret Higgins
LTC Stephen F. SP5 Mark Kuzinski COL Mikel J. Burroughs SMSgt Lawrence McCarter Maj William W. 'Bill' PriceCPL Dave Hoover SSG William Jones Sgt Vance Bonds Cpl (Join to see) PO1 H Gene Lawrence Maj Robert Thornton PO3 Bob McCord SPC Douglas Bolton Lt Col Charlie Brown TSgt Joe C. PO3 Craig Phillips CW5 Jack Cardwell SFC Joe S. Davis Jr., MSM, DSL SGT Mark Anderson SPC Margaret Higgins
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What a fantastic image of the Moon with a shadow line across it from the Earth! Simply a wonderful photo! Thank you for sharing this as part of your APOD series Maj William W. 'Bill' Price!!!
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