I don't get it. What's so confusing about it? Though not great prose, it seems clear enough
See my other recent response.
Jon
A base unit of 1/12.7E6 inch would give integer representation of 10 micro inches and 10nm with a bit more than +/-4 meters range from a 32bit int.
Doesn't that work out better all round?
I.e. a 2nm unit. Yeah, but who has boards bigger than 2 meters?
... snip 110 useless lines ...
Did this exquisite reply really require quoting 110 useless lines?
It's just a confusing web page.
Say, are we sure that the Universe is expanding, or are we shrinking, so that the rest of the Universe only _looks_ like it's expanding? ;-)
Cheers! Rich
That could very well be the case - maybe what was significant at the time is that they did it in rockets, and/or that the "discovery" was reported in Time magazine, in about a 6-page spread with color glossy artists' conceptions and stuff. :-)
Thanks! Rich
Seriosly. Are there people using gEDA (or any other CAD program) to layout boards bigger then 2m?
And if they are, what software do they currently use? If one can afford to build 2m PCBs the costs of the layout software is probably negligible anyway.
Some years ago Delorme took their Street Atlas USA software and split it up into various versions (basic/deluxe/commercial/etc.)... one of the compalints of people with the new version was that the cheap version (but not cheaper than the old version) refused to print to anything larger than 11x17. Most annoying to cripple software like that...
If they are, they can rebuild PCB on a 64-bit platform too ;-)
(if anyone complains that they need a PCB bigger than the galaxy, let them buy a 128-bit platform ;)
Consider relativity, as expounded by Einstein about 1905.
My computer has things called "scroll bars."
John
In order to determine the shape of Earth, you had to measure the absolute distance between two latitudes (measured in degrees by astronomical means) to determine the size of a latitude degree. These measurements have to be done both close to the Equator as well as close to the Pole.
This was first done by the French Geodesic Mission
Paul
Are such huge PCBs actually used ?
There would be problems with the mechanical support, thermal expansion and hygroscopic effects with such huge boards.
The only use I can think of for such huge boards would be some (micro)stripline filters and transmission lines for VHF or lower UHF and perhaps for constructing large patch antennas with some active electronics integrated between the patches.
Paul
So, because of that, you quoted 4140 unnecessary characters, wasted our time having to scroll past them and figure out what you actually were replying to, and also wasted who knows how much bandwidth to download it and local storage to look at it?
How many copies of your message do you figure have been made?
George
That was the one whose name escaped me, and had a very interesting story from starting off spending the expedition's money on a hooker in the West Indies...
....
Sounds like people had not done their research as the shape of the Earth mattered to map makers, and navigation long before rockets.
Re-inventing the wheel, and putting a marketing spin on why things went wrong.
Does not sound good to me, but typical of large projects based on technology 'silver bullet' blindness, without fully researching and understanding the problems.
The geoid (the equipotential water level assuming no tide or wind effects) differs about +/-100 m from the reference ellipsoid
This variation of the gravitational field would attract the rocket during the whole trajectory, causing some deviation from the expected target.
I don't see how these gravitational variations could be mapped accurately before orbiting satellites (by measuring their deviation from the theoretical orbit).
On the Moon, the mascons (mass concentrations) cause so much gravtiy field anomaly that a lunar satellite will crash to the Moon within months or a year, unless active orbital corrections are made.
Paul
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If you measure the distance between two points and the angle of that short line repeatedly, you can produce a measure of a curve. The distance measurement can be done with survey methods of triangulation. The angle measurement can be done by sighting stars.
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The above is roughly how your reply SHOULD have been snipped.
Some useful links on quoting:
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