Great Circle distance
 

Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

HankG

HankG wrote:

Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

Perhaps about 12,500 miles? Circumference of the earth is about 25,000 miles at
the equator.

dxAce
Michigan
The United States of America

12,500 miles checks out on my Encarta World Atlas
11,584 miles is the furthest DX catch I can get
That is AFN Pearl Harbour
Comes in here regularly on 10,320 Khz
9,672 miles is the distance from dxAce's Holland, MI, QTH to his beloved
Diego Garcia.
11,900 miles is the longest LW/MW catch I ever heard of.
That was NZ DXers getting France from Invercargill.
My longest MW catch was Spokane, WA - 10,300 miles

Have fun and good DX for the New Year
--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
Icom IC-756 PRO III with MW mods
RX Drake R8B, SW8 & ERGO software
Sony 7600D GE SRIII
BW XCR 30, Braun T1000, Sangean 818 & 803A.
Hallicrafters SX-100, Eddystone 940
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop

"dxAce" wrote in message
...

HankG wrote:

Just curious. Anyone know what the longest GC distance from any point
on
Earth to any other point?

Perhaps about 12,500 miles? Circumference of the earth is about 25,000
miles at
the equator.

dxAce
Michigan
The United States of America

In message , HankG
writes
Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

From you to your neighbour via long path.

Mike
--
M.J.Powell

"HankG" wrote in message
...
Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

Download this and it will show you the SP and LP to any location, plus the
grey line.

http://www.dxatlas.com/Download.asp
--
Simon Mason
Anlaby
East Yorkshire.
53°44'N 0°26'W
http://www.simonmason.karoo.net

Earth's circumference at the Equator is more like 24,000 miles.24 hours
in a day and Earth rotates about 1,000 miles per hour.We are zooming
through the Universe at about 60,000 miles per hour.Hold on to your
hats,folks!
cuhulin

The Constellation Earth is in is zooming through the Universe at about
60,000 miles per hour,that is.Boy!,what a Ride!
cuhulin

wrote in message
...
The Constellation Earth is in is zooming through the Universe at about
60,000 miles per hour,that is.Boy!,what a Ride!
cuhulin

What is the name of the constellation Earth is in?

--
Simon Mason
Anlaby
East Yorkshire.
53°44'N 0°26'W
http://www.simonmason.karoo.net

I don't reckymember right now.Why,you want me to cheat and look it up
first?
(I took my wife to a drive in theater last night!,spent all night trying
to find out what car she was in! The Great,Rodney Dangerfield)
www.rodney.com
cuhulin

OK,maybe it is Galaxy I meant to say.Whatever.
cuhulin

My spin -- comments welcome

Are you talking about the antipode distance or how far a radio wave can
travel around the earth ???

For antipode -- The earth has a circumference of approximately 24,900 miles.
More precisely the circumference of the earth at the equator is 24,902 mi
So 1/2 of 24,902 = 12,451 miles. That's half way around the world (at the
equator)
But as some one quipped -- from you to your next door neighbor is all the
way around the earth ~ 24,900 miles

For radio transmissions, one can transmit long path and achieve distances
greater than 12,451miles

For example the short path distance from So Calif to South Africa is about
9,895 miles but the long path distance is 14,962 miles

I have worked long path to South Africa on Ham radio many times
--
LC




"HankG" wrote in message
...
Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

HankG

In article ,
HankG wrote:
Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

20,000 km. +/- some error the original metric system's surveyors made.
(The original definition of the meter was that the great circle distance
from the North Pole through Paris to the Equator was 10,000 km).

Mark Zenier Washington State resident

On 2005-01-02, Simon Mason wrote:

wrote in message
...
The Constellation Earth is in is zooming through the Universe at about
60,000 miles per hour,that is.Boy!,what a Ride!
cuhulin

What is the name of the constellation Earth is in?


Smegmalonius

On Sun, 2 Jan 2005 09:03:24 -0500, "HankG" wrote:

Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

Of course, the original definition (not the current definition) of the
meter was 1/10-millionth of the distance between the north pole and
the quator. So, presumably, the distance from pole to pole is 20
million meters or 20,000 km.

The earth is not quite a sphere - I believe the equator is slightly
longer than a circle of longitude.

"M. J. Powell" wrote in message
From you to your neighbour via long path.

Or, from to you to YOU, via longpath!

Mark.
Auckland
New Zealand.

21,585 nautical miles from my location to my location via longpath!

Mark.
Auckland
New Zealand.

In message 1104723596.308715@ftpsrv1, Mark writes
"M. J. Powell" wrote in message
From you to your neighbour via long path.

Or, from to you to YOU, via longpath!

Even better!

Mike

"beerbarrel" wrote in message
actually I was replying to Simon...I think he was trying to trick
someone. The earth is part of the Milky Way galaxy. All 88
constellations are viewed from a position on Earth so how could the
earth be in one? If viewed from another far off position, they would
look different.

It wasn't a trick. He might have been on the Moon in which case the Earth
would be in a constellation.

--
Simon Mason
Anlaby
East Yorkshire.
53°44'N 0°26'W
http://www.simonmason.karoo.net

"Joel Rubin" wrote
On Sun, 2 Jan 2005 09:03:24 -0500, "HankG" wrote:

Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

Of course, the original definition (not the current definition) of the
meter was 1/10-millionth of the distance between the north pole and
the quator. So, presumably, the distance from pole to pole is 20
million meters or 20,000 km.

The earth is not quite a sphere - I believe the equator is slightly
longer than a circle of longitude.

I was not aware there was ever any intention to make a kilometer relational
to a nautical mile. It is not, and is just as arbitrary a length of
measurement in relationship to a nautical mile (which derives from the
spherical geometry of all modern positioning) as the statute (English) mile.
Metric arithmetic is certainly easier (for humans, computers could care
less) than statute miles. But both are arbitrary as far as latitude and
longitude are concerned and each require an equal effort of arithmetic to
convert to nautical miles. Air and marine charts use nautical miles for this
reason.

Jack Painter
Virginia Beach, Virginia

You are right.Earth is part of the Milky Way Galaxy.I remembered that
when I read your post.And I did not look it up either.
cuhulin

"beerbarrel" wrote in message

It wasn't a trick. He might have been on the Moon in which case the Earth
would be in a constellation.


Then you should have asked what constellation it would have been in
tonight it would be changing constantly.

The Moon takes about 28 days to orbit the Earth. There are about 14
"zodiacal"
constellations that the Earth could be in. So it would be in any given
constellation for roughly 2 days. So an answer to what constellation Earth
was in on *that* particular day would have sufficed.

In fact, I've cranked up my Redshift program, set it to my post of 1716 UTC
2 JAN 05 and set up my location as the Moon. I then asked it to find the
Earth in the sky. It was in Pisces as you can see he

http://www.simonmason.karoo.net/zredshift.htm
--
Simon Mason
Anlaby
East Yorkshire.
53°44'N 0°26'W
http://www.simonmason.karoo.net

Never ask an Irishman for directions! I am Scotch Irish by ancestry and
sure as the World,you would get lost every time :{)
cuhulin

Simon Mason wrote:

"beerbarrel" wrote in message

It wasn't a trick. He might have been on the Moon in which case the Earth
would be in a constellation.


Then you should have asked what constellation it would have been in
tonight it would be changing constantly.

The Moon takes about 28 days to orbit the Earth. There are about 14
"zodiacal"
constellations that the Earth could be in. So it would be in any given
constellation for roughly 2 days. So an answer to what constellation Earth
was in on *that* particular day would have sufficed.

In fact, I've cranked up my Redshift program, set it to my post of 1716 UTC
2 JAN 05 and set up my location as the Moon. I then asked it to find the
Earth in the sky. It was in Pisces as you can see he

http://www.simonmason.karoo.net/zredshift.htm

Next we'll be getting into horoscopes! ;-)

dxAce
Michigan
USA

"beerbarrel" wrote in message
...


The fact is, from his vantage point the Earth will never be in a
constellation. What if he had been aboard the ISS?

Earth would be in about 40 constellations at once :-)

--
Simon M.

In article hqdCd.13035$622.3888@lakeread02,
Jack Painter wrote:
"Joel Rubin" wrote
On Sun, 2 Jan 2005 09:03:24 -0500, "HankG" wrote:

Just curious. Anyone know what the longest GC distance from any point on
Earth to any other point?

Of course, the original definition (not the current definition) of the
meter was 1/10-millionth of the distance between the north pole and
the quator. So, presumably, the distance from pole to pole is 20
million meters or 20,000 km.

The earth is not quite a sphere - I believe the equator is slightly
longer than a circle of longitude.

I was not aware there was ever any intention to make a kilometer relational
to a nautical mile. It is not, and is just as arbitrary a length of
measurement in relationship to a nautical mile (which derives from the
spherical geometry of all modern positioning) as the statute (English) mile.
Metric arithmetic is certainly easier (for humans, computers could care
less) than statute miles. But both are arbitrary as far as latitude and
longitude are concerned and each require an equal effort of arithmetic to
convert to nautical miles. Air and marine charts use nautical miles for this
reason.

Duh. The nautical mile is tied to the babylonian units for angle.
(1 minute of arc on the earths surface is one nautical mile.
Which arc they used varied, so different countries nautical miles
were a bit different).

The metric system uses the Grad, where the circle is divided into.
400 units.

1 Grad of Latitude = 100 km.

I thought the military used Grads, but maybe that's just Army Artillery.

Mark Zenier Washington State resident

Not me,I don't believe in that Phoney Baloney horoscope stuff.Or ufos or
space aliens either.
cuhulin

"beerbarrel" wrote in message
...


Have you looked at macholz(sp) yet?

"Simon Mason" wrote in message news:...

"beerbarrel" wrote in message
...


Have you looked at macholz(sp) yet?

Not yet. I only found out about it the other day and it's been cloudy since.
I should able to see it out of my window now except for these darn clouds.

--
Simon M.

"beerbarrel" wrote in message
...


Have you looked at macholz(sp) yet?

Comet Machholz? Not yet. I only found out about it the other day and it's
been cloudy since. I should able to see it out of my window now except for
these darn clouds.

--
Simon M.

A married Irish woman whom I have known via the internet for over five
years.She works for a govt department in Bognor Regis,England.She says
it's allways ****in rain over there.
cuhulin

I get a Space email newsletter which I subscribed to about five years
ago.It is an interesting newsletter.
cuhulin

"Mark Zenier" wrote
In article hqdCd.13035$622.3888@lakeread02,
Jack Painter wrote:
"Joel Rubin" wrote
On Sun, 2 Jan 2005 09:03:24 -0500, "HankG" wrote:

Just curious. Anyone know what the longest GC distance from any point
on
Earth to any other point?

Of course, the original definition (not the current definition) of the
meter was 1/10-millionth of the distance between the north pole and
the quator. So, presumably, the distance from pole to pole is 20
million meters or 20,000 km.

The earth is not quite a sphere - I believe the equator is slightly
longer than a circle of longitude.

I was not aware there was ever any intention to make a kilometer
relational
to a nautical mile. It is not, and is just as arbitrary a length of
measurement in relationship to a nautical mile (which derives from the
spherical geometry of all modern positioning) as the statute (English)
mile.
Metric arithmetic is certainly easier (for humans, computers could care
less) than statute miles. But both are arbitrary as far as latitude and
longitude are concerned and each require an equal effort of arithmetic to
convert to nautical miles. Air and marine charts use nautical miles for
this
reason.

Duh. The nautical mile is tied to the babylonian units for angle.
(1 minute of arc on the earths surface is one nautical mile.
Which arc they used varied, so different countries nautical miles
were a bit different).

The metric system uses the Grad, where the circle is divided into.
400 units.

1 Grad of Latitude = 100 km.

I thought the military used Grads, but maybe that's just Army Artillery.

Mark Zenier Washington State resident


"DUH" ??? (you sure you're not Canadian?)

Artillery is not navigation. The Army changed to metric because it couldn't
teach arithmetic that didn't use the 10-fingers/10-toes concept. All well
and good except that left it with no way to make the kilometer into anything
relational to the earth or navigational geometry, which it has neither in
common with. Hence the GRAD, which does NOT refer to having completed more
than six GRADES, or knowing anything about navigation. If you're trying to
get somewhere over the horizon instead of hitting it with a howitzer, then
reading "Practical Navigation:" by Bowditch will be much more useful than
anything the Army taught you.

Hooo-Awww
Jack Painter
Virginia Beach, Virginia

I am used to the old American style of measurments.I can easily enough
picture in my mind how long an inch,foot,mile is.I can fairly easily
picture how large a square inch,square foot,square mile is.I couldn't
care less than less about metrics,kilometers,stuff like that.When I did
my boot camp at Fort Gordon,Georgia (Company D 5 2) in November and
December of 1962,one of our classes there was guessing how many feet
from point A to point B is.I was off by quite a few feet on that.I know
about how much longer a kilometer is than a mile,1.40,I think a
kilometer is.But still,I have no interest at all in learning metrics.To
me,it is sort of like if you come to America,speak English language,I am
NOT! going to learn your foreign language!
cuhulin