Surprising somebody hasn't dropped in the "It's Aliens" meme yet...
You just did, didn’t you?
Do not meddle in the affairs of wizards, for thou art crunchy and taste good with catsup.
when I learned to sail, and finally earned a Captains license, the proper navigation method was to use Magnetic north along with a variance +/- for local magnetic field offsets. compute the direction, add or subtract for compass course, adjust for compass reading by adding or subtracting variance, then plot your heading.
as a blow boater, just using compass heading without the added math was always "good enough" for coastal sailing.
it would be interesting how this is being handled by current GPS technology. or if the old Loran system would be affected by shift in magnetic fields?
I wouldn't worry too much about the Poles, they are staunch allies.
|On the DL|
Interesting (or maybe not) bit of aviation trivia here: Aeronautical navigation charts are printed on a grid, with the vertical lines oriented to true north.
VORs transmit navigation signals that are oriented to magnetic north. Or, are they? Maybe not.
The difference between true north and magnetic north, at any given location, is magnetic variation, usually shortened to just "variation."
When planning a flight that will use the magnetic compass in the airplane as the primary navigation aid (yes, we still do this for some flights, even in the age of GPS), the course line on the chart shows the desired track with respect to true north. The local variation, as determined by isogonic lines on the chart is added (for westerly variation) or subtracted (for easterly variation) to obtain the magnetic course. Standard stuff.
Now, if we use VORs for navigation, the signal transmitted by the VOR is already referenced to magnetic north, so no further correction is needed for variation. But wait, there's a catch. Because the magnetic north pole drifts around a bit, the variation at any given location might differ a bit from year to year. Magnetic north for VORs, as depicted on the chart, is not updated and is not necessarily current. It is shown on the charts as it was, at the time that the VOR station was commissioned, so there might be a difference between magnetic course as calculated using current variation, and magnetic course derived from a VOR.
The preceding little known fact was brought to you by Cliff Clavin.
A mind is a terrible thing.
from the abyss
Will my toilet flush in the opposite direction?
That'd be cool.
"How dreadful are the curses which Mohammedanism lays on its votaries! Besides the fanatical frenzy, which is as dangerous in a man as hydrophobia in a dog, there is this fearful fatalistic apathy." Winston Churchill
So, the South Pole is still on break?
It's from moving earth & building heavy objects.
Throwing the balance off.
I'm surprised the ppl that protect the earth haven't made laws covering global weight distribution.
I guess it's time to learn how to use a sextant.
"They who would give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety."
- Benjamin Franklin
"So this is how liberty dies; with thunderous applause."
- Senator Amidala (Star Wars III: Revenge of the Sith)
|Lawyers, Guns |
I hope Guam doesn't tip over!
"Some things are apparent. Where government moves in, community retreats, civil society disintegrates and our ability to control our own destiny atrophies. The result is: families under siege; war in the streets; unapologetic expropriation of property; the precipitous decline of the rule of law; the rapid rise of corruption; the loss of civility and the triumph of deceit. The result is a debased, debauched culture which finds moral depravity entertaining and virtue contemptible."
-- Justice Janice Rogers Brown
"The United States government is the largest criminal enterprise on earth."
I thought this was common scientific knowledge. Apparently only to bona fide scientists. The sky is falling bullshit never gets old.
Lover of the US Constitution
Wile E. Coyote School of Gunsmithing
You can only go so far in any one direction before you eventually drive off a cliff
I didn't think anyone would notice. Sorry... I'll put it back.
If I can remember how
343 - Never Forget
Its better to be Pavlov's dog than Schrodinger's cat
There are three types of mistakes; Those you learn from, those you suffer from, and those you don't survive.
|Nature is full of |
Not unless the earth reverses the direction of its rotation, or you move to the southern hemisphere. While it is true the direction of the rotation of the flush is not strictly due to the coriolis effect, it surely is not related to magnetism.
Disclaimer: Snopes apparently disagrees with my college professors, so YMMV.
Loran operated on essentially the same principles as modern GPS.
Both systems use stations transmitting synchronized signals. The user receives these signals, which are no longer synchronized because he is different distances from the different stations, so the signals take different amounts of time to reach him. By precisely measuring the offsets between the signals and referring to the known locations of the stations, the user can triangulate his position. It's just that Loran used ground stations and GPS uses satellites, and GPS is a lot newer so the stations are better synchronized and the users can measure the offsets more precisely.
In either case, magnetic north has nothing to do with the process.
They are more expensive than magnetic compasses, but many boats and I expect virtually all ships have gyrocompasses on board. A gyrocompass is a fascinating instrument that uses gyroscopic precession to automatically align itself with the axis of the rotation of the earth (true north). No dependence on the Earth's magnetic field at all.
Modern sensor technology has actually advanced to the point that now there are "gyrocompasses" that don't actually have gyroscopes in them - they can measure the movement of the instrument with enough precision that they can simply measure the rotation of the earth directly (yes, even in a moving vessel!) and determine the axis of rotation.
Like erasing a giant Etch-e-Sketch.
Sliced bread, the greatest thing since the 1911.
New York Times just said Trump did it!
|The Unmanned Writer|
The following professionals were quoted to predict (these are a couple of the leading scientists in these matters) :
Sentiment without action is the ruin of the soul.
Help, I'm having premonitions of future flashbacks.
Only in an insane world are the sane considered insane.
Some people listen to the noise of the world,
And some people listen to the quiet.
Please explain why when 2 dogs meet, butt-sniffing rotation occurs counter-clockwise? If the poles are reversed, will they start butt-sniffing clockwise?
If you can't dazzle them with brilliance, baffle them with bullshit!
Sigs Owned - A Bunch
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