Hello:

A bit confused over Great Circle directions.

I believe that if one is traveling from Boston to London via air along the
great circle connecting these two cities, he would Constantly have to adjust
his heading; e.g., one compass
heading the whole way won't do it.

Is this correct ?

So, now to my real question"

Let's say that there is an omni broadcast station in London, and that its
broadcast goes out in all directions.

I believe radio waves follow great circles when considering a spherical
globe.
True ?

Then, how would the chap in Boston, assuming he has an extremely directional
antenna, point his antenna ?

Would it just be the final angle along the great circle when it crosses
Boston ?

Looked, but surprisingly couldn't find any good links to any great circle
direction programs on the web.
Lots that calculate distances, but couldn't locate any that show distances,
etc., relative to my questions above.

Anyone happen to know of any ?

Much thanks,
Bob

On Sun, 25 Dec 2005 10:59:56 -0500, "Robert11"
wrote:

Hello:

A bit confused over Great Circle directions.

I believe that if one is traveling from Boston to London via air along the
great circle connecting these two cities, he would Constantly have to adjust
his heading; e.g., one compass
heading the whole way won't do it.

Is this correct ?

So, now to my real question"

Let's say that there is an omni broadcast station in London, and that its
broadcast goes out in all directions.

I believe radio waves follow great circles when considering a spherical
globe.
True ?

Then, how would the chap in Boston, assuming he has an extremely directional
antenna, point his antenna ?

Would it just be the final angle along the great circle when it crosses
Boston ?

Looked, but surprisingly couldn't find any good links to any great circle
direction programs on the web.
Lots that calculate distances, but couldn't locate any that show distances,
etc., relative to my questions above.

Anyone happen to know of any ?

Much thanks,
Bob


Radio waves follow the shortest path (primarily)

http://gc.kls2.com/

David wrote:

On Sun, 25 Dec 2005 10:59:56 -0500, "Robert11"
wrote:

Hello:

A bit confused over Great Circle directions.

I believe that if one is traveling from Boston to London via air along the
great circle connecting these two cities, he would Constantly have to adjust
his heading; e.g., one compass
heading the whole way won't do it.

Is this correct ?

So, now to my real question"

Let's say that there is an omni broadcast station in London, and that its
broadcast goes out in all directions.

I believe radio waves follow great circles when considering a spherical
globe.
True ?

Then, how would the chap in Boston, assuming he has an extremely directional
antenna, point his antenna ?

Would it just be the final angle along the great circle when it crosses
Boston ?

Looked, but surprisingly couldn't find any good links to any great circle
direction programs on the web.
Lots that calculate distances, but couldn't locate any that show distances,
etc., relative to my questions above.

Anyone happen to know of any ?

Much thanks,
Bob


Radio waves follow the shortest path (primarily)

http://gc.kls2.com/

Long path is popular as well.

dxAce
Michigan
USA

Robert11 wrote:
Hello:

A bit confused over Great Circle directions.

I believe that if one is traveling from Boston to London via air along the
great circle connecting these two cities, he would Constantly have to adjust
his heading; e.g., one compass
heading the whole way won't do it.

Is this correct ?

So, now to my real question"

Let's say that there is an omni broadcast station in London, and that its
broadcast goes out in all directions.

I believe radio waves follow great circles when considering a spherical
globe.
True ?

Then, how would the chap in Boston, assuming he has an extremely directional
antenna, point his antenna ?

Would it just be the final angle along the great circle when it crosses
Boston ?

Looked, but surprisingly couldn't find any good links to any great circle
direction programs on the web.
Lots that calculate distances, but couldn't locate any that show distances,
etc., relative to my questions above.

Anyone happen to know of any ?

Much thanks,
Bob



Some basics:

http://www.ac6v.com/greatcircle.htm


A spread sheet program that should be easily adapted to other forms:

http://home.inu.net/davidstua/Lat_Long.htm


A java script calculator:

http://www.airways.com/java/coordcalc.html


A great circle distance calculator in Visual basic. I don't know if it
does angles of direction, though.

http://snipurl.com/l20q


Many different calculators, including Great Circle stuff:

http://www.martindalecenter.com/Calc...s1B_7_Nav.html



From the above site:

http://williams.best.vwh.net/gccalc.htm



mike

On Sun, 25 Dec 2005 11:14:44 -0500, dxAce
wrote:



David wrote:

On Sun, 25 Dec 2005 10:59:56 -0500, "Robert11"
wrote:

Hello:

A bit confused over Great Circle directions.

I believe that if one is traveling from Boston to London via air along the
great circle connecting these two cities, he would Constantly have to adjust
his heading; e.g., one compass
heading the whole way won't do it.

Is this correct ?

So, now to my real question"

Let's say that there is an omni broadcast station in London, and that its
broadcast goes out in all directions.

I believe radio waves follow great circles when considering a spherical
globe.
True ?

Then, how would the chap in Boston, assuming he has an extremely directional
antenna, point his antenna ?

Would it just be the final angle along the great circle when it crosses
Boston ?

Looked, but surprisingly couldn't find any good links to any great circle
direction programs on the web.
Lots that calculate distances, but couldn't locate any that show distances,
etc., relative to my questions above.

Anyone happen to know of any ?

Much thanks,
Bob


Radio waves follow the shortest path (primarily)

http://gc.kls2.com/

Long path is popular as well.

dxAce
Michigan
USA


Hence the ''primarily''

The ''long path'' is actually the second shortest, ain't it?

The ''long path'' is actually the second shortest, ain't it?

Wait. I'm trippin'...

David wrote:


The ''long path'' is actually the second shortest, ain't it?

Wait. I'm trippin'...

So, what else is new, 'tard boy?

LMFAO at the mentally ill stem known as David Rickets.

dxAce
Michigan
USA

David wrote:


The sum of the distances of the short path and long path will equal the
circumference of the globe.

I know. I was on drugs.
x

Oh. Well..that's all right. I thought for a second you were having an
'Ace' moment, which is indeed a frightening prospect.


mike

Hello:

A bit confused over Great Circle directions.

I believe that if one is traveling from Boston to London via air along
the
great circle connecting these two cities, he would Constantly have to
adjust
his heading; e.g., one compass
heading the whole way won't do it.

Is this correct ?

Yep.. If you left Boston with the autopilot on a direct
heading to London, it would constantly adjust the heading
as you fly. The heading would slowly increase as you
fly east. You might leave Boston heading appx 070,
but be about 110 or so by the time you got to London.
You'll go from heading northeast, to heading southeast
after you get to the highest lattitude near the pole.

So, now to my real question"

Let's say that there is an omni broadcast station in London, and that
its
broadcast goes out in all directions.

I believe radio waves follow great circles when considering a spherical
globe.
True ?

yep.

Then, how would the chap in Boston, assuming he has an extremely
directional
antenna, point his antenna ?

About 69-70 degrees or so.

Would it just be the final angle along the great circle when it crosses
Boston ?

I suppose. Would be the same as laying a string across a globe
from London to Boston. The string would pass near Greenland, etc.

Looked, but surprisingly couldn't find any good links to any great
circle
direction programs on the web.
Lots that calculate distances, but couldn't locate any that show
distances,
etc., relative to my questions above.

Anyone happen to know of any ?

Someone showed a few links. If you want a map, the ARRL map
is laid out so you can get beam headings. Also should be beam
heading calculator programs out there somewhere. . I can use my
flight simulator and do that using the GPS... :/ Sitting at Logan
in Boston in my trusty Lear 31a, the heading to London Heathrow
is 69 degrees according to the GPS. 2827 nautical miles...
MK

m II wrote:

David wrote:

The sum of the distances of the short path and long path will equal the
circumference of the globe.

I know. I was on drugs.
x

Oh. Well..that's all right. I thought for a second you were having an
'Ace' moment, which is indeed a frightening prospect.

You only wish you had an 'Ace moment'!

LMFAO yet again at the crazy Canucky 'tard boy.

dxAce
Michigan
USA