Ah, John,
In the words of way too many math professors, "It is obvious that ....." .
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:albertson.ch...@gmail.com]
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 <jo...@autoartisans.com>
wrote:
From: John Dammeyer [mailto:jo...@autoartisans.com]
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
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Chris Albertson
Redondo Beach, California
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