> From: dave engvall [mailto:[email protected]] > Ah, John, > In the words of way too many math professors, "It is obvious that ....." .
Hear hear! Having said that though I must admit I probably use more math than most. About 11 years ago I had to look up Airy Disk effect and then do the math to work out lamp positions. https://en.wikipedia.org/wiki/Airy_disk#Mathematical_formulation I think if anything that came from it all it's that the math courses gave me the confidence to attempt a solution. It was really cool when the end result matched the math. John Dammeyer > > On 8/19/20 7:12 PM, John Dammeyer wrote: > > My computer science degree required 4 terms of calculus, 2 terms of linear > > algebra, 2 terms of differential equations, 4 terms of > physics and 2 terms of statistics. I think that was all of it. I also took > a nuclear physics course that was quite interesting. The diff > equations were part of the electrical engineering minor. > > > > Didn't really do much with astronomy so I really don't quite get how they > > figured out the distance to the sun. But I thought it was > interesting as is the book 'sapiens'. > > https://www.amazon.com/Sapiens-Humankind-Yuval-Noah-Harari/dp/0062316095 > > > > Oh and I remember almost none of all that math. Too long ago. > > > > John Dammeyer > > > >> -----Original Message----- > >> From: Chris Albertson [mailto:[email protected]] > >> Sent: August-19-20 6:59 PM > >> To: Enhanced Machine Controller (EMC) > >> Subject: Re: [Emc-users] OT: Synchronised motion using RS485/CAN bus motors > >> > >> Yes, If this is a theoretical discussion then at the end of all the chains > >> of reasoning it all comes to "mutually observed event". If this is just > >> engineering then it comes down to "the delay is so fast no one cares". > >> - > >> My background is computer science. Computer science is a mash-up of > >> mathematical theory and practical engineering. In some classes we did > >> proofs and others we built stuff. It is kind of fun to look both ways. > >> > >> A real disaster happened at TRW some years back where us poor working > >> minions were required to do proofs on the stuff we were building. Looking > >> both ways at the same time did not work. > >> > >> On Wed, Aug 19, 2020 at 6:10 PM John Dammeyer <[email protected]> > >> wrote: > >> > >>> > >>>> From: John Dammeyer [mailto:[email protected]] > >>>> I was just reading a few weeks ago in the book "Sapiens" that the early > >>> explorers set up an experiment where they would observe an > >>>> astronomical event from both England and the South Pacific. Something > >>> about either time or position. > >>>> I think it was Cook who was exploring at that point. I'll have to dig > >>> through to see exactly what it was. > >>>> Still quite something to plan on observing something that will take you > >>> a year or more before you are even there to do the observing. > >>> Chapter 15, The marriage of science and empire. James Cook was > >>> commissioned to take astronomers and others to the pacific to be there in > >>> 1769 to measure the duration of the transit that Venus makes across the > >>> sun. Apparently measured from different places on earth results in simple > >>> trigonometry to determine the distance of the earth from the sun. > >>> > >>> Who knew. > >>> > >>> John > >>> > >>> > >>> > >>> > >>> _______________________________________________ > >>> Emc-users mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>> > >> > >> -- > >> > >> Chris Albertson > >> Redondo Beach, California > >> > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
