tag:blogger.com,1999:blog-2999230124118604245.post7173140193023303353..comments2024-03-28T16:36:12.581-04:00Comments on Gurney Journey: Alexander’s Dark BandJames Gurneyhttp://www.blogger.com/profile/01870848001990898499noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-2999230124118604245.post-58785578717434383232008-09-23T09:01:00.000-04:002008-09-23T09:01:00.000-04:00Interesting....most interesting. Thanks James for...Interesting....most interesting. Thanks James for enlightening us on the matter.Jared Shearhttps://www.blogger.com/profile/14879406947140189516noreply@blogger.comtag:blogger.com,1999:blog-2999230124118604245.post-57277149437273717462008-09-21T17:28:00.000-04:002008-09-21T17:28:00.000-04:00You've got it. That's a great way to do the diagra...You've got it. That's a great way to do the diagram. I've never seen it drawn in reference to the viewer's shadow, but that explains it. And it's good the way you drew a series of parallel rays in the lower diagram.James Gurneyhttps://www.blogger.com/profile/01870848001990898499noreply@blogger.comtag:blogger.com,1999:blog-2999230124118604245.post-53802058972703083102008-09-21T14:58:00.000-04:002008-09-21T14:58:00.000-04:00... and the sun should be higher up. That's what y...... and the sun should be higher up. That's what you get for doing diagrams in half a minute about things you don't fully understand...David Stillhttps://www.blogger.com/profile/06788583610600014354noreply@blogger.comtag:blogger.com,1999:blog-2999230124118604245.post-3177568943474823992008-09-21T14:55:00.000-04:002008-09-21T14:55:00.000-04:00So, more like this then? The framed picture is fro...So, more like this then? The framed picture is from your view, where the dot in the head of your shadow is the line going from C, the antisolar point, straight into your eye? (Only the lines seem to come from the person's mouth in the lower diagram.. Oh, well)<BR/><BR/>http://img.photobucket.com/albums/v219/real_Serpian/0921-gj2.jpgDavid Stillhttps://www.blogger.com/profile/06788583610600014354noreply@blogger.comtag:blogger.com,1999:blog-2999230124118604245.post-69575707672370739762008-09-21T12:57:00.000-04:002008-09-21T12:57:00.000-04:00David, yes, that drawing looks right except that t...David, yes, that drawing looks right except that the line from the sun to the back of the viewer's head should be aligned with the line from the viewer to the antisolar point. If you were in an airplane, the antisolar point would be the shadow of the airplane below you. Or anywhere you're standing, the antisolar point is wherever you see the shadow of your own head. <BR/><BR/>That's a bit hard to show in a diagram. Check out this one: <BR/><BR/>www.cartage.org.lb/.../Rainbows/Rainbows.htmJames Gurneyhttps://www.blogger.com/profile/01870848001990898499noreply@blogger.comtag:blogger.com,1999:blog-2999230124118604245.post-51838883606634425752008-09-21T09:47:00.000-04:002008-09-21T09:47:00.000-04:00Even if it's not a realistic one, is this diagram ...Even if it's not a realistic one, is this diagram then the correct way to think?<BR/><BR/>http://img.photobucket.com/albums/v219/real_Serpian/0921-gj.jpgDavid Stillhttps://www.blogger.com/profile/06788583610600014354noreply@blogger.comtag:blogger.com,1999:blog-2999230124118604245.post-46087901420159099672008-09-21T08:04:00.000-04:002008-09-21T08:04:00.000-04:00Good question. Yes, the center of the rainbow's ci...Good question. Yes, the center of the rainbow's circle is the antisolar point. That's the point 180 degrees opposite the sun. So if the sun is directly behind you, the antisolar point in ahead of you, and the rainbow rises above it. <BR/><BR/>The angles are measured in relation to the line from your eye to the antisolar point. Photographing a full double rainbow takes a camera with a lens that can capture more than 100 degrees of viewing angle, more than you would normally use in a photo or a painting.James Gurneyhttps://www.blogger.com/profile/01870848001990898499noreply@blogger.comtag:blogger.com,1999:blog-2999230124118604245.post-30624385172001597102008-09-21T06:15:00.000-04:002008-09-21T06:15:00.000-04:00I've still not quite understood your post about th...I've still not quite understood your post about the science of rainbows. Is the center of the circle of the rainbow the antisolar point? Is the 42 degree then from the line between the solar and antisolar point, that would go from behind the viewer straight into the picture, so to speak, making the 42 degree go 'upward'?David Stillhttps://www.blogger.com/profile/06788583610600014354noreply@blogger.com