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RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/13/2007 4:20:49 AM   
Vendaval


Posts: 10297
Joined: 1/15/2005
Status: offline 		Popeye, would you please explain the "mercator projection"
and the "gnormonic projection".
 
Thank you,
 
Vendaval

quote:

ORIGINAL: popeye1250
When you fly from Boston to Europe say the planes go up over canada and within a few hundred miles of Iceland kind of "hugging the coast" in "great circle sailing."
On a mercator projection that would look like "circular" flying but on a Gnomonic projection it would look like a straight line from point to point due to the curvature of the earth.


_____________________________

"Beware, the woods at night, beware the lunar light.
So in this gray haze we'll be meating again, and on that
great day, I will tease you all the same."
"WOLF MOON", OCTOBER RUST, TYPE O NEGATIVE


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RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 8:38:43 AM   
thompsonx


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Joined: 10/1/2006
Status: offline
quote:

ORIGINAL: Vendaval

Popeye, would you please explain the "mercator projection"
and the "gnormonic projection".
 
Thank you,
 
Vendaval

quote:

ORIGINAL: popeye1250
When you fly from Boston to Europe say the planes go up over canada and within a few hundred miles of Iceland kind of "hugging the coast" in "great circle sailing."
On a mercator projection that would look like "circular" flying but on a Gnomonic projection it would look like a straight line from point to point due to the curvature of the earth.


Vendaval:
If you look at most maps of the world you will note that the parallels of latitude are not equally spaced, they become farther apart as you aproach the poles,this is a mercator map.  If you look at a globe you will notice that the lines of latitude are equally spaced. If you were to unwrap the map off of the globe and lay it flat it would appear as a series of orange peals sliced off of an orange (pointy at the top and bottom and connected at the center) this is a gnomic map.
If you were to take a string and lay it on a globe between any two points (clearly the shortest distance) and then transfer that line to a mercator map it would appear as a curved line.
thompson

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RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 8:43:44 AM   
mnottertail


Posts: 60698
Joined: 11/3/2004
Status: offline 		This concept being a fundamental building block of Einsteins Relativity, for anyone who cares.  (Curvature of space)



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RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 9:56:05 AM   
FukinTroll


Posts: 6277
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From: Under a bridge
Status: offline 		I thought Einstein’s theory of relativity was if you fuk your sister you would have a mutant.

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RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 12:21:32 PM   
popeye1250


Posts: 18104
Joined: 1/27/2006
From: New Hampshire
Status: offline
quote:

ORIGINAL: Vendaval

Popeye, would you please explain the "mercator projection"
and the "gnormonic projection".
 
Thank you,
 
Vendaval

quote:

ORIGINAL: popeye1250
When you fly from Boston to Europe say the planes go up over canada and within a few hundred miles of Iceland kind of "hugging the coast" in "great circle sailing."
On a mercator projection that would look like "circular" flying but on a Gnomonic projection it would look like a straight line from point to point due to the curvature of the earth.



Vendaval, sure, a "Mercator" projection on a nautical chart would look much like a street map, everything where it's supposed to be, used for smaller distances.
A "Gnomonic" projection on a nautical chart would be for very large distances, i.e. it would have Europe and the U.S. on the chart but it also accounts for the curvature of the earth so it looks "distorted" like if you were to peel off the paper on a globe.
If you drew a straight line on a "Gnomonic" projection and transferred that line to a "Mercator" projection it would look "curved."

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Profile   Post #: 25
RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 1:48:25 PM   
Vendaval


Posts: 10297
Joined: 1/15/2005
Status: offline 		Thank you both for the explanation, thompson and popeye. 

_____________________________

"Beware, the woods at night, beware the lunar light.
So in this gray haze we'll be meating again, and on that
great day, I will tease you all the same."
"WOLF MOON", OCTOBER RUST, TYPE O NEGATIVE


http://KinkMeet.co.uk

(in reply to popeye1250)
Profile   Post #: 26
RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 1:50:20 PM   
popeye1250


Posts: 18104
Joined: 1/27/2006
From: New Hampshire
Status: offline 		P.S. if you've ever flown cross country or to Europe or Asia you might have noticed that the pilot will "change course" 2 or three times during the flight.
He's actually flying in a straight line!
The course changes are to compensate for the curvature of the earth.

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RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 1:56:14 PM   
Vendaval


Posts: 10297
Joined: 1/15/2005
Status: offline 		Yes, makes perfect sense.  The exact terminology was unfamiliar
to me.  Always good to learn something new about the world from
someone with different experiences.

_____________________________

"Beware, the woods at night, beware the lunar light.
So in this gray haze we'll be meating again, and on that
great day, I will tease you all the same."
"WOLF MOON", OCTOBER RUST, TYPE O NEGATIVE


http://KinkMeet.co.uk

(in reply to popeye1250)
Profile   Post #: 28
RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/14/2007 9:11:36 PM   
popeye1250


Posts: 18104
Joined: 1/27/2006
From: New Hampshire
Status: offline 		Well, I went to Navigation school when I was in the U.S. Navy.
It was pretty interesting learning all that type of stuff.
Out at sea we'd "shoot stars" with a sextant to find out where we were.

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Profile   Post #: 29
RE: "How Vikings Might Have Navigated on Cloudy Da... - 3/15/2007 1:04:57 AM   
Vendaval


Posts: 10297
Joined: 1/15/2005
Status: offline 		My older brothers were both in the Navy.  The eldest was in
between Korea and Vietnam and did not have to serve
in combat situations.  The next eldest served during Vietnam
and saw combat.  He still has a hard time talking about what
happened when he was there.

_____________________________

"Beware, the woods at night, beware the lunar light.
So in this gray haze we'll be meating again, and on that
great day, I will tease you all the same."
"WOLF MOON", OCTOBER RUST, TYPE O NEGATIVE


http://KinkMeet.co.uk

(in reply to popeye1250)
Profile   Post #: 30
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