What is the exact longitude/latitude of the corner of Tower One (the
corner closest to Tower Two) of the World Trade Center?  Please
indicate which corner it is (e.g. northwest corner).

Hello tairuadennis-ga,

While spurious-ga has provided some useful information, I believe that
spurious's interpretation is incorrect.  Moreover, I now feel
confident that I have found the answer.

Latitude 40.71100 and Longitude -74.01170 does not, in fact, fall in
the middle of Ground Zero.  Rather, it is somewhat east of the middle
of Ground Zero, as well as east of the southeast corner of Tower One. 
You can see this by comparing the Mapquest map with the Adelaide map,
or better yet, with this map:

"World Trade Center - Site Plan Drawing, with Notes"
The Great Buildings Collection
http://www.greatbuildings.com/cgi-bin/gbc-drawing.cgi/World_Trade_Center.html/World_Trade_Site_Plan.gbd

The latitude seems nearly right to answer your question.  Indeed, it
translates to 40° 42 Min. 40 Sec., just three seconds south of what I
indentified for the Tower One antenna.

The longitude is too far east.  It translates to 74° 42 Min. 42 Sec.,
seven seconds east of what I identified for the Tower One antenna.

If you plug in the coordinates that I identified for the Tower One
antenna into Mapquest and zoom in as far as possible, you'll see this:

"Latitude: 40° 42 Min.43 Sec., Longitude: -74° 00 Min. 49 Sec."
Mapquest
http://www.mapquest.com/maps/map.adp?latlongtype=degrees&latdeg=40&latmin=42&latsec=43&longdeg=-74&longmin=00&longsec=49

This does indeed appear to be the location of the Tower One antenna,
contrary to what spurious-ga indicated.  It is at the same position as
the middle of the roof in the Great Buildings Collection drawing --
lined up with Dey Street and between Washington Street and the West
Side Highway.

I believe that the location of the southeast corner is best placed one
second east and south of that antenna -- in other words, Latitude: N
40° 42 Min. 42 Sec. and Longitude: W 74° 00 Min. 48 Sec.

"Latitude: 40° 42 Min.42 Sec., Longitude: -74° 00 Min. 48 Sec."
Mapquest
http://www.mapquest.com/maps/map.adp?latlongtype=degrees&latdeg=40&latmin=42&latsec=42&longdeg=-74&longmin=00&longsec=48

It is logical to move the same amount south and east from the antenna,
since the antenna was in the middle of a square roof.  The facade of
the building was 208 feet wide, and so the antenna was 104 feet from
the east facade and from the south facade.  A second of distance is
101.45 feet, meaning that one would need to move about one second east
and one second south of the antenna to reach the south corner.

"World Trade Center" [mentioning length of facade under "Discussion -
World Trade Center Commentary"]
The Great Buildings Collection
http://www.greatbuildings.com/buildings/World_Trade_Center.html

"GPS Coordinate Explanation" [mentioning number of feet in a second of
distance under "Degrees/Minutes/Seconds"]
LIFE - Guide to Australia
http://life.csu.edu.au/geo/coord.html

The position on the Mapquest map matches the location of the southeast
corner of Tower One on the Great Buildings Collection drawing.  On the
Mapquest map, this point is located between Dey and Cortlandt Streets,
and is lined up with Washington Street.  That was the location of the
southeast corner of Tower One, as indicated by the drawing.

I hope that this information is helpful.

- justaskscott-ga


Search terms used on Google:

"world trade center"
degree minute second feet
"40 42" "74 00"

I was satisfied with justaskscott-ga rationale and investigations to
obtain an answer to my question.  I also appreciated the comments of
other researchers although they didn't carry the information to it's
conclusion as scott did.
Thank you very much everyone.   tairuadennis

The best I could find on this relatively guarded subject was this single reference:

Latitude: 40 N 43   
Longitude: 74 W 00  

Is this sufficient as an answer?

Best regards;
Tutuzdad-ga

INFORMATION SOURCES

ASTRODATABANK
http://www.astrodatabank.com/NM/TerrorismNYDC1.htm

Here is a little broader reference, but it doesn't specify a particilar corner:

http://www.kimdara.com/usaphotomaps/
N. Latitude 40.71100   
W. Longtitude 74.01170  

tutuzdad-ga

Extremely close to what you're looking for:

"ANTENNA LOCATION: ONE WORLD TRADE CENTER, NEW YORK, NY (40-42-43 
74-00-49)"

"Report No. 24459 - Broadcast Applications" (March 30, 1999) [near
bottom of page, under "Commercial Digital Television Station
Applications Accepted for Filing"]
Federal Communications Commission
http://www.fcc.gov/Bureaus/Mass_Media/Public_Notices/Brdcst_Applications/ap990330.txt

Like tutuzdad-ga, I'd be happy to post my comment as an answer if it
is sufficient.

The same coordinates are listed here:

"Datensammlung zum Terroranschlag auf das World Trade Center am
11.09.2001 in New York"
Astrothek
http://www.astrothek.de/wtc.htm

I'm not a Researcher and these guys have helped me out before, so
you're honor bound to pick one to pay if my comment answers your
question.

tutuzdad-ga's reference looks pretty close to me.  Try the following
link, click aerial photo and drill down to the highest resolution. 
You're looking at the middle of ground zero.

http://www.mapquest.com/maps/map.adp?latlongtype=decimal&latitude=40.71100&longitude=-74.01170

USGS shows thermal hot spots that confirm the exact locations:
http://pubs.usgs.gov/of/2001/ofr-01-0429/thermal.r09.html

Thermal hot spots are located at:

 Location  Temperature Area  
Hot Spot N Latitude  W Longitude  (Kelvin) % FOV  sq meter 
A  40o 42' 47.18" 74o 00' 41.43" 1000  15 0.56  
B  40o 42' 47.14" 74o 00' 43.53" 830  2 0.08  
C  40o 42' 42.89" 74o 00' 48.88" 900  20 0.8  
D  40o 42' 41.99" 74o 00' 46.94" 790  20 0.8  
E  40o 42' 40.58" 74o 00' 50.15" 710  10 0.4  
F  40o 42' 38.74" 74o 00' 46.70" 700  10 0.4  
G  40o 42' 39.94" 74o 00' 45.37" 1020  1 0.04 
H  40o 42' 38.60" 74o 00' 43.51" 820  2 0.08 

Positions are in degrees-minutes-decimal seconds, datum WGS84.
Position accuracy is estimated to be approximately +/- 6 meters (18
feet).

Adelaide University has a technical document that has a FEMA map on
page 4 which shows the layout of the WTC site.

http://www.dhpc.adelaide.edu.au/reports/106/dhpc-106.pdf

Cross-referencing between the above FEMA site plan and the below USGS
satellite thermal imaging key, we can see that G (40o 42' 39.94" 74o
00' 45.37") corresponds to the South Tower and C (40o 42' 42.89" 74o
00' 48.88") corresponds to the North Tower.  Maybe you can more
accurately spot the positions and interpolate exact coordinates of the
spot on the building that you want.

http://pubs.usgs.gov/of/2001/ofr-01-0429/hotspot.key.tgif.gif

According to this data, justaskscott-ga's reference places the antenna
on the roof of the South Tower.

For confirmation and additional information, an astrology website
gives WTC building coordinates (40N42:41, 74W00:45; map sourced) and
impact timing (seismology sourced).  Link was found by googling
similat sites to tutzdad-ga's reference.
http://www.astrodatabank.com/NM/WTCAttack.htm