[Scan-DC] Parallel Runways at Dulles?

[oldsdoug at hotmail.com]

Wow, this is getting interesting...  technically, one would have to correct for the curvature of the earth, right?  This is getting too deep for me!

> Date: Mon, 9 Jun 2008 01:05:55 +0100
> From: sdaitch at KUW.IBB.GOV
> To: jmhayes at speakeasy.net
> CC: scan-dc at mailman.qth.net
> Subject: [Scan-DC] Parallel Runways at Dulles?
>
>
>
> Jordan,
>
> I got to thinking about the parallel situation, and I don't
> think the fact the two runways have slightly different
> headings, 11.0 degrees for 1C, and 11.1 degrees for 1R,
> doesn't mean they are not parallel.
>
> Remember, lines of longitude converge at the North and South
> Poles, so two north-south lines with the exact same heading
> separated by some distance would not be exactly parallel.
>
> In other words, someone heading 360 degrees true
> from Atlanta, and someone else heading 360 degrees true from
> San Francisco, will eventually meet at the North Pole.
>
> The only way to determine the parallelism of the two runways is
> to compare the centerline spacing at the north end of the runways
> and the centerline spacing at the south end of the runways.
>
> My guess, and this is a guess only, is the two runways really
> are parallel and the difference in the headings is due to the
> convergence of lines of longitude.
>
> Just an academic thought.
>
> 73
> Sheldon
>
>
>
> ----- Original Message -----
> From: Jordan Hayes 
> Date: Sunday, June 8, 2008 7:49 pm
> Subject: Re: [Scan-DC] Dulles Gets New Runway (name, at least)
>
>> Go to airnav dot com and click airports, type in IAD, and download
>> the
>> PDF of the airport diagram for more details.
>>
>> Fun fact: 19C and 19L aren't exactly parallel.
>>
>> /jordan
>
>
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