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The Great Circle Challenge  
User currently offlineAloges From Germany, joined Jan 2006, 8617 posts, RR: 43
Posted (9 years 11 months 3 weeks 6 days 14 hours ago) and read 2752 times:

So I'm a bit bored...

Just recently, I asked myself which would be the longest great circle that could be entered into the Great Circle Mapper.

The longest I have come up with is AKL-GIB at 10749 (nautical) miles, any takers? Big grin


Walk together, talk together all ye peoples of the earth. Then, and only then, shall ye have peace.
17 replies: All unread, jump to last
 
User currently offlineScottishLaddie From United Kingdom, joined Jan 2004, 2384 posts, RR: 8
Reply 1, posted (9 years 11 months 3 weeks 6 days 14 hours ago) and read 2715 times:

LCA-PPT 11221 miles  Big grin

User currently offlineAloges From Germany, joined Jan 2006, 8617 posts, RR: 43
Reply 2, posted (9 years 11 months 3 weeks 6 days 14 hours ago) and read 2687 times:

Not to rain on your parade, but try switching to nautical miles ("Path Distance" dropdown)!  Big grin


Walk together, talk together all ye peoples of the earth. Then, and only then, shall ye have peace.
User currently offlineScottishLaddie From United Kingdom, joined Jan 2004, 2384 posts, RR: 8
Reply 3, posted (9 years 11 months 3 weeks 6 days 14 hours ago) and read 2681 times:

Grrr Big grin  Big grin

Filler


User currently offlineRedngold From United States of America, joined Mar 2000, 6907 posts, RR: 45
Reply 4, posted (9 years 11 months 3 weeks 6 days 13 hours ago) and read 2606 times:

Isn't SIN-UIO the longest possible? I think I read somewhere that Singapore and Quito, Ecuador, are exactly opposite (polar opposites) nearest to the equator... which would be the longest possible great circle.

SIN-UIO, 10649 nm

AKL-GIB doesn't look right... If you plug in GIB-AKL, although it shows 10749 nm, I think that is an error. I did a straight-line great circle mapping on a globe, and it doesn't even go near Antarctica.

Here's the great circle line I ended up with AKL-GIB (roughly):

AKL
Cook Islands (N.Z. territory)
Guadalajara, Mexico
east of Mobile, Alabama, US
Cape Hatteras, North Carolina, US
north of Terceira, Azores (Portugal territory)
Gibraltar



Up, up and away!
User currently offlineBen From Switzerland, joined Aug 1999, 1391 posts, RR: 51
Reply 5, posted (9 years 11 months 3 weeks 6 days 13 hours ago) and read 2570 times:

The longest possible great circle on the earth is 10,800 nautical miles... so you're pretty close to that limit.

Each minute of latitude is one nautical mile. There are 60 minutes in a degree, and 180 degrees in half of the earth by following a great circle. That = 10,800 nm.


User currently offlineRedngold From United States of America, joined Mar 2000, 6907 posts, RR: 45
Reply 6, posted (9 years 11 months 3 weeks 6 days 13 hours ago) and read 2558 times:

Yes, I understand that 10,800 nm is the limit; but the great circle plotting of AKL-GIB over Antarctica just doesn't make sense!

Take a look at the plot of AKL-MAD... It's much more what I'd expect for AKL-GIB -- going north, then west, and finally south. AKL-GIB should be almost due northeast for the entire trip.

[Edited 2004-04-30 01:21:50]


Up, up and away!
User currently offlineTFJamie From Hong Kong, joined Mar 2004, 122 posts, RR: 0
Reply 7, posted (9 years 11 months 3 weeks 6 days 13 hours ago) and read 2548 times:

if you look at the coordinates AKL-GIB are around 7 minutes from being 180 degrees apart in the E-W direction and the difference in the S-N coords is 51 minutes

In UIO-SIN the difference in S-N coords is 1 degree and 13 minutes and 2.5 degrees from being 180 degrees apart in the E-W direction, so the distance should be less

A flaw in this is the difference in the size of longitudes, but polar opposites have the same S-N coords and are 180 deg. apart in the E-W direction.

On a side note:
AKL-OZP is 10786nm


User currently offlineRedngold From United States of America, joined Mar 2000, 6907 posts, RR: 45
Reply 8, posted (9 years 11 months 3 weeks 6 days 13 hours ago) and read 2506 times:

AKL-GRZ is 10743 nm, and also has a route much more like what I would approximate for AKL-GIB.

AKL-GIB the other way, by my estimate:

AKL
SYD
just south of MLB
northern edge of the Maldives
ashore on Africa east northeast of Salalah, Oman
just north of Medina, Saudia Arabia
just south of Alexandria, Egypt
just south of Sfax, Tunisia
GIB

[Edited 2004-04-30 01:33:16]


Up, up and away!
User currently offlineOlympus69 From Canada, joined Jun 2002, 1737 posts, RR: 7
Reply 9, posted (9 years 11 months 3 weeks 6 days 12 hours ago) and read 2431 times:

AKL and GIB are so close to being 180 degrees of longitude apart that the position of the airports in relation to the cities (for Auckland anyway) could affect which direction is shorter.

User currently offlineUSAFHummer From United States of America, joined May 2000, 10685 posts, RR: 53
Reply 10, posted (9 years 11 months 3 weeks 6 days 11 hours ago) and read 2390 times:

La Coruna, Spain (LCG) - Christchurch, New Zealand (CHC) : 10769 nm  Smile

http://gc.kls2.com/cgi-bin/gc?PATH=LCG-CHC%0D%0A&RANGE=&PATH-COLOR=red&PATH-UNITS=nm&SPEED-GROUND=&SPEED-UNITS=kts&RANGE-STYLE=best&RANGE-COLOR=navy&MAP-STYLE=

Greg



Chief A.net college football stadium self-pic guru
User currently offlineSQ452 From United States of America, joined Apr 2004, 1082 posts, RR: 0
Reply 11, posted (9 years 11 months 3 weeks 6 days 11 hours ago) and read 2369 times:

PPT-JNB

10,365 nm

if you want to see a weird one on the map (makes an L'ish look on GCM) try JNB-ANC....funky!



SIN > CVG > BOS
User currently offlineBohica From United States of America, joined Feb 2004, 2630 posts, RR: 0
Reply 12, posted (9 years 11 months 3 weeks 6 days 11 hours ago) and read 2363 times:

I got it!!!

HNL-GNZ (Ghanzi Botswana) 10,774 nm. Big grin

From the Great Circle Mapper:

From To Distance
HNL (21°19'07"N 157°55'21"W) GNZ (21°41'S 21°39'E) 10774 nm







User currently offlineRedngold From United States of America, joined Mar 2000, 6907 posts, RR: 45
Reply 13, posted (9 years 11 months 3 weeks 6 days 11 hours ago) and read 2330 times:

USAFHummer:
That's a great one! It's much more like what I would have expected from AKL-GIB... the smooth double curve.

SQ452:
That's the same error that was coming up with AKL-GIB.



Up, up and away!
User currently offlineBlackbird1331 From United States of America, joined Apr 2004, 1892 posts, RR: 0
Reply 14, posted (9 years 11 months 3 weeks 6 days 11 hours ago) and read 2300 times:

Call me dizzy. Glad it's time for bed.


Cameras shoot pictures. Guns shoot people. They have the guns.
User currently offlineSQ452 From United States of America, joined Apr 2004, 1082 posts, RR: 0
Reply 15, posted (9 years 11 months 3 weeks 6 days 11 hours ago) and read 2296 times:

oh, yah it seemed a bit odd Redngold that it would do that.

Still, I love the Great Circle Mapper



SIN > CVG > BOS
User currently offlineTFJamie From Hong Kong, joined Mar 2004, 122 posts, RR: 0
Reply 16, posted (9 years 11 months 3 weeks 6 days 10 hours ago) and read 2272 times:

Like said before 10786 is the unbeaten record of AKL-OZP (Moron, Spain).

Isn't it always shortest over the poles if the places are polar opposites, and in fact that any direction would come out the same if flown in a straight line (Look at the poles themselves, any direction you go from them, and you will end up at the other one).



User currently offlineTimz From United States of America, joined Sep 1999, 6708 posts, RR: 7
Reply 17, posted (9 years 11 months 3 weeks 5 days 20 hours ago) and read 2134 times:

Maximum possible distance is 10801.26 nm on the WGS84 spheroid. Auckland to Moron does indeed look like 10786.26 nm; initial course from Auckland would be 326.3 degrees true.

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