# lowest great circle constant altitude flight?

**URL:** <https://boards.straightdope.com/t/lowest-great-circle-constant-altitude-flight/698100>\
**Category:** Factual Questions\
**Created:** [September 10, 2014, 6:35pm UTC](https://boards.straightdope.com/t/lowest-great-circle-constant-altitude-flight/698100 "2014-09-10T18:35:55Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![septimus](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/septimus/32/410_2.png) [@septimus](https://boards.straightdope.com/u/septimus)\
**Post date:** [September 11, 2014, 2:29am UTC](https://boards.straightdope.com/t/lowest-great-circle-constant-altitude-flight/698100/12 "2014-09-11T02:29:10Z")

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> [@bump](#):
>
> Here you go.
> 
> [http://www.gcmap.com/mapui?P=NZWD-PAWD%2C+&PM=b%3Adisc7%2B%25U&MS=wls&DU=mi&E=180](http://www.gcmap.com/mapui?P=NZWD-PAWD%2C+&PM=b%3Adisc7%2B%25U&MS=wls&DU=mi&E=180)

I was excited to see your link because I have my own great circle puzzles to solve. And was curious to personally [verify this great-circle related conspiracy theory](http://www.grahamhancock.com/phorum/read.php?f=1&i=174348&t=173765).

But your site doesn’t actually show great circles – just segments of such circles. And asks for airport codes. Is there a way to use that site (or another) for what I want?  
ETA: The definition of circumnavigation has been considered here before:

> [@How many miles to circumnavigate the Earth by boat?](https://boards.straightdope.com/t/how-many-miles-to-circumnavigate-the-earth-by-boat/615387/12):
>
> > [@How many miles to circumnavigate the Earth by boat?](https://boards.straightdope.com/t/how-many-miles-to-circumnavigate-the-earth-by-boat/615387/11):
> >
> > I think this is equivalent to my criterion, which is that at least one pair of points on the route be antipodal to each other.
> 
> Yes, though come to think of it either definition would allow you to travel West from Ecuador to Singapore and then turn around, never visiting Indian or Atlantic Oceans. Adding the requirement “Visit every meridian” is insufficient since it allows you to start from Antarctica, circumnavigate the Arctic and come back, never visiting the Pacific.
> 
> Back to the drawing board. :dubious:
> 
> ETA: Perhaps the key is to intersect each great circle twice. :eek:

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