Ed et al. -- Hope you guys saw this interesting story in the NYT Magazine yesterday about Ingrid Daubechies. A wonderful character with a great mind. https://www.nytimes.com/2021/09/14/magazine/ingrid-daubechies.html
TJ On Mon, Sep 20, 2021 at 6:04 PM Edward Angel <an...@cs.unm.edu> wrote: > Quaternions avoid much of the ugly trigonometry since quaternion rotation > is along a great circle. They’re very useful for smooth rotations in > computer graphics and many aerospace applications. > > Ed > _______________________ > > Ed Angel > > Founding Director, Art, Research, Technology and Science Laboratory > (ARTS Lab) > Professor Emeritus of Computer Science, University of New Mexico > > 1017 Sierra Pinon > Santa Fe, NM 87501 > 505-984-0136 (home) an...@cs.unm.edu > 505-453-4944 (cell) http://www.cs.unm.edu/~angel > > On Sep 20, 2021, at 9:19 AM, Steve Smith <sasm...@swcp.com> wrote: > > Answering my own earlier question (with props) it seems that a (smooth) > globe and piece of string would be good support for an intuitive > approach. My sister made a "hanging string lampshade" in 3rd grade by > wrapping cotton string soaked in glue around a large balloon and letting it > dry. I inherited it when she went into middle school and was "too cool" > for it anymore. I would lay in bed and stare at it, remembering the > challenges (I helped wrap the string) of getting the slick string to do > *anything* but following near-great-circles. The shadows it cast on the > walls (and furniture) might have been my first awareness of projective > geometry... I abandoned it when I went to college. > > I assume (REC?) that early age-of-exploration navigators were more > constrained by trade-winds and convenient resupply/port-of-call than > great-circles, though misunderstanding spherical geometry would be very > inconvenient. > > I also believe that Polynesian stick charts would have great-circleness > (or more-to-the-point shortest time paths) built into them by their nature, > not any arcane understanding of spherical (ellipsoidal) geometry. I'm sure > they have been studied quite thoroughly. > > > On 9/19/21 3:36 PM, Stephen Guerin wrote: > > In the early 90s, my expat friends in Beijing would often debate which > were the closer US Cities to Beijing by eyeballing the globe - wish we had > this too for easy lookup back then. Of course, we could have used lat/longs > and calculated haversine distances but we had pints to drink - and frankly > it would have been difficult for me to find the algorithm in the nascent > web back then ;-) > > Beijing (PEK) Great Circle Distances for 10 US cities > <https://www.greatcirclemap.com/globe?routes=%20PEK-SEA%2C%20PEK-LAX%2C%20PEK-DET%2C%20PEK-SAN%2C%20PEK-MSP%2C%20PEK-YYZ%2C%20PEK-EWR%2C%20PEK-ORD%2C%20PEK-ANC%2C%20PEK-BGR%2C%20PEK-HNL> > > <image.png> > > > _______________________________________________________________________ > stephen.gue...@simtable.com <stephen.gue...@simtable.com> > CEO, Simtable http://www.simtable.com > 1600 Lena St #D1, Santa Fe, NM 87505 > office: (505)995-0206 mobile: (505)577-5828 > twitter: @simtable > z <http://zoom.com/j/5055775828>oom.simtable.com > > > On Sun, Sep 19, 2021 at 3:22 PM Frank Wimberly <wimber...@gmail.com> > wrote: > >> That gives a good view, Stephen. Hawaii is farther south than I >> thought. Thanks. >> >> --- >> Frank C. Wimberly >> 140 Calle Ojo Feliz, >> Santa Fe, NM 87505 >> >> 505 670-9918 >> Santa Fe, NM >> >> On Sun, Sep 19, 2021, 3:19 PM Stephen Guerin <stephen.gue...@simtable.com> >> wrote: >> >>> I was going to post this similar site but Ed beat me with his :-) This >>> one also has a globe view... >>> >>> https://www.greatcirclemap.com/globe?routes=CLT-HNL >>> _______________________________________________________________________ >>> stephen.gue...@simtable.com <stephen.gue...@simtable.com> >>> CEO, Simtable http://www.simtable.com >>> 1600 Lena St #D1, Santa Fe, NM 87505 >>> office: (505)995-0206 mobile: (505)577-5828 >>> twitter: @simtable >>> z <http://zoom.com/j/5055775828>oom.simtable.com >>> >>> >>> On Sun, Sep 19, 2021 at 2:03 PM Frank Wimberly <wimber...@gmail.com> >>> wrote: >>> >>>> Thanks, Ed. That's useful. >>>> >>>> --- >>>> Frank C. Wimberly >>>> 140 Calle Ojo Feliz, >>>> Santa Fe, NM 87505 >>>> >>>> 505 670-9918 >>>> Santa Fe, NM >>>> >>>> On Sun, Sep 19, 2021, 1:54 PM Edward Angel <an...@cs.unm.edu> wrote: >>>> >>>>> Close: https://www.airmilescalculator.com/distance/clt-to-hnl/ >>>>> _______________________ >>>>> >>>>> Ed Angel >>>>> >>>>> Founding Director, Art, Research, Technology and Science Laboratory >>>>> (ARTS Lab) >>>>> Professor Emeritus of Computer Science, University of New Mexico >>>>> >>>>> 1017 Sierra Pinon >>>>> Santa Fe, NM 87501 >>>>> 505-984-0136 (home) an...@cs.unm.edu >>>>> 505-453-4944 (cell) http://www.cs.unm.edu/~angel >>>>> >>>>> On Sep 19, 2021, at 1:48 PM, Frank Wimberly <wimber...@gmail.com> >>>>> wrote: >>>>> >>>>> Not to change the subject but... >>>>> >>>>> A large airliner recently, 15 minutes ago, flew over Santa Fe headed >>>>> west. My Flight Radar app tells me that it's a Boeing 777 going from >>>>> Charlotte to Honolulu at an altitude of 38000 feet. I wouldn't have >>>>> thought that Santa Fe was on a great Circle route between those two >>>>> cities. But maybe it is. >>>>> >>>>> --- >>>>> Frank C. Wimberly >>>>> 140 Calle Ojo Feliz, >>>>> Santa Fe, NM 87505 >>>>> >>>>> 505 670-9918 >>>>> Santa Fe, NM >>>>> >>>>> .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- >>>>> - . >>>>> FRIAM Applied Complexity Group listserv >>>>> Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam >>>>> un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>>>> FRIAM-COMIC http://friam-comic.blogspot.com/ >>>>> archives: >>>>> 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ >>>>> 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >>>>> >>>>> >>>>> >>>>> .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- >>>>> - . >>>>> FRIAM Applied Complexity Group listserv >>>>> Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam >>>>> un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>>>> FRIAM-COMIC http://friam-comic.blogspot.com/ >>>>> archives: >>>>> 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ >>>>> 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >>>>> >>>> >>>> .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- >>>> - . >>>> FRIAM Applied Complexity Group listserv >>>> Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam >>>> un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>>> FRIAM-COMIC http://friam-comic.blogspot.com/ >>>> archives: >>>> 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ >>>> 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >>>> >>> >>> .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- - >>> . >>> FRIAM Applied Complexity Group listserv >>> Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam >>> un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>> FRIAM-COMIC http://friam-comic.blogspot.com/ >>> archives: >>> 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ >>> 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >>> >> >> .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- - . >> FRIAM Applied Complexity Group listserv >> Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam >> un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >> FRIAM-COMIC http://friam-comic.blogspot.com/ >> archives: >> 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ >> 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >> > > .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- - . > FRIAM Applied Complexity Group listserv > Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam > un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > FRIAM-COMIC http://friam-comic.blogspot.com/ > archives: > 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ > 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ > > > .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- - . > FRIAM Applied Complexity Group listserv > Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam > un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > FRIAM-COMIC http://friam-comic.blogspot.com/ > archives: > 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ > 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ > > > > .-- .- -. - / .- -.-. - .. --- -. ..--.. / -.-. --- -. .--- ..- --. .- - . > FRIAM Applied Complexity Group listserv > Zoom Fridays 9:30a-12p Mtn UTC-6 bit.ly/virtualfriam > un/subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > FRIAM-COMIC http://friam-comic.blogspot.com/ > archives: > 5/2017 thru present https://redfish.com/pipermail/friam_redfish.com/ > 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >
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