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Old April 24th, 2009, 02:51 AM   #21
Northsider
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I'm not good at math. Sounds like you know what you are talking about though.
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Old April 29th, 2009, 10:35 PM   #22
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Looking toward Philadelphia from the ESB--

NE corner of the top of Comcast is about 39.954871 n 75.168226 w, geoid height there -32.93; center of the ESB is 40.7484335, 74.985655, geoid height -31.74. Spheroid radius of curvature at the ESB is 6376692 m, at Comcast 6375814, so I'll say sea level has a radius of 6376221 m along that line. I'll figure ESB height 1300 ft above sea level, Comcast 1010 ft.

Turns out the unrefracted straight line is 0.5 meters above sea level at its lowest point; ground elevation never exceeds 40 meters anywhere around there, so if the air is clear enough (which maybe it never is) refraction could be enough to make a beacon visible.

Then there are the towers at Roxborough-- it seems the highest one is 472.1 meters above sea level at about 40-02-30.1 N 75-14-10.1 W. Unrefracted sightline is 91 meters above sea level at its lowest point; there's a 280-ft ridge a couple kilometers west of there, so we'll need some refraction here too.

The map is at http://tinyurl.com/d4wr69 and it shows that Google's lines aren't perfectly accurate.
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Old February 22nd, 2012, 05:40 AM   #23
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I know I saw NY from Philly.

I flew into Philly summer 2010 on a bright clear sunny day. While waiting to get permission to land I'm very very sure that I was looking at NYC in the far distance. I could see tall buildings way out on the horizon. I was so geeked but I didn't want to seem like a fool so I just kept it to myself.
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Old February 22nd, 2012, 12:38 PM   #24
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You can see the same distance in any direction from the Empire State Building....on a clear day.....although maybe out over the Atlantic would have a further absolute horizon ?
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Old February 22nd, 2012, 06:39 PM   #25
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looking for a few good ones

westward view



http://tiny.cc/oliev

eastern view



http://tiny.cc/ze0bb

Northern View



Southern view


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Old February 23rd, 2012, 05:59 AM   #26
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You can't see Philly from the ESB, but once 1WTC is complete, you'll be able to see the beam of light from Philly.
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Old February 23rd, 2012, 08:16 AM   #27
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Quote:
Originally Posted by Uaarkson View Post
You can't see Philly from the ESB, but once 1WTC is complete, you'll be able to see the beam of light from Philly.
LOL , that would be impossible. Philly is 2hrs away....you can't see Philly from NYC or vis versa. The Farthest you can see NYC is in the Mountains 40 miles away , that's on a super clear day , on a smoggy day your visibility is cut down to 15-20miles...
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Old February 23rd, 2012, 08:20 AM   #28
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Quote:
Originally Posted by southphilly1974 View Post
I flew into Philly summer 2010 on a bright clear sunny day. While waiting to get permission to land I'm very very sure that I was looking at NYC in the far distance. I could see tall buildings way out on the horizon. I was so geeked but I didn't want to seem like a fool so I just kept it to myself.
Probably weren't looking at NYC , probably was New Brunswick or Atlantic City which both have tall buildings that look like NYC from a far. Its also impossible to see NYC from Philly , there about 90 miles apart.
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Old February 23rd, 2012, 11:30 PM   #29
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Quote:
Originally Posted by Abidrovia View Post
Where was that pic taken from?

How far away?
looks like they were taken from Bear Mt
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Old February 25th, 2012, 07:23 AM   #30
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Quote:
Originally Posted by Nexis View Post
Probably weren't looking at NYC , probably was New Brunswick or Atlantic City which both have tall buildings that look like NYC from a far. Its also impossible to see NYC from Philly , there about 90 miles apart.
They are actually only 80 miles, and given the WTC beam will be very clear up to ~3000' in the air, I wouldn't be surprised if it were indeed visible from Philly.
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Old February 25th, 2012, 05:26 PM   #31
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ik for a fact you can see the empire state building from the fire tower on mount beacon on a very clear day, which is 60 miles north
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Old February 25th, 2012, 11:03 PM   #32
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Quote:
Originally Posted by redbaron_012 View Post
You can see the same distance in any direction from the Empire State Building....on a clear day
You could if there weren't any hills blocking your view, as they do to the north and west. On a reasonably clear day the Bridgeport stack is visible 51 miles away; the Connecticut shoreline is visible for a few miles beyond it, but I've never identified any particular building there. The mast at 40.2826N 74.68635W is silhouetted in the afternoon 49 miles away.

Beacon Mtn is 51 miles away.

Last edited by timz; February 26th, 2012 at 02:13 AM.
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Old February 26th, 2012, 02:10 AM   #33
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Quote:
Originally Posted by southphilly1974 View Post
I flew into Philly summer 2010 on a bright clear sunny day. While waiting to get permission to land I'm very very sure that I was looking at NYC in the far distance.
Suspect you're right. Wonder from what altitude the skyline would show up best? Probably if it's right on the horizon, silhouetted against the sky beyond-- so maybe 5000 ft or so?
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Old February 27th, 2012, 04:17 AM   #34
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Quote:
Originally Posted by babybackribs2314 View Post
They are actually only 80 miles, and given the WTC beam will be very clear up to ~3000' in the air, I wouldn't be surprised if it were indeed visible from Philly.
I still doubt that , its 80 miles and its flat if you can't see it now what makes you think a beam will be visible...?
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Old February 27th, 2012, 08:42 PM   #35
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Quote:
Originally Posted by Nexis View Post
if you can't see it now what makes you think a beam will be visible...?
No reason to think you can't see it now, from 5000 ft altitude. From the top of the Comcast Center is harder to predict.
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Old February 28th, 2012, 02:19 AM   #36
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If the beam of light is a thick, bright laser-esque beam like what is being advertised, you would most definitely see it from the taller buildings from Philly on a clear night.
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Old February 29th, 2012, 12:28 AM   #37
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Quote:
Originally Posted by Uaarkson View Post
If the beam of light is a thick, bright laser-esque beam like what is being advertised...
Probably the folks in the neighboring buildings will successfully object to anything "laser-esque"?

What is being advertised?
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Old February 29th, 2012, 03:05 AM   #38
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it's 1776 feet in the sky neighboring buildings wont be able to see it and i doubt it will bother those at a distance either.
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Old February 29th, 2012, 04:35 AM   #39
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I'm sure bankers in Zurich don't mind the mountains!
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Old February 29th, 2012, 04:37 AM   #40
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Behold:




Consider also: some guy in the 1WTC construction thread claims that a PA source confirmed there would be only horizontal lighting. Who knows.
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