Timeline for Is the sphere the only surface with circular projections? Or: Can we deduce a spherical Earth by observing that its shadows on the Moon are circular?
Current License: CC BY-SA 2.5
5 events
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| Sep 17, 2010 at 21:54 | comment | added | Joel David Hamkins | This is a really great perspective; thank you very much for your answer. I had in mind an ideal situation, with opaque objects (not necessarily convex) and isometric projections. Of course, not all of that is the case in the application to the Earth and Moon, but that application was merely inspiring the question. But allowing translucent objects and looking at the pattern of light intensity makes things really interesting... | |
| Sep 17, 2010 at 21:48 | history | edited | sleepless in beantown | CC BY-SA 2.5 |
xray is in $xz$ plane, not $yz$ plane
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| Sep 17, 2010 at 21:48 | comment | added | sleepless in beantown | The xray in the tomography example is flat in the $xz$ plane, perpendicular to the $y$-axis. Can't get my edit to stick yet. | |
| Sep 17, 2010 at 21:14 | history | edited | sleepless in beantown | CC BY-SA 2.5 |
added a paragraph attempting to answer the question, trying to make my answer non-tangential
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| Sep 17, 2010 at 21:04 | history | answered | sleepless in beantown | CC BY-SA 2.5 |