by neufer » Sat Mar 20, 2010 3:54 pm
Tripp wrote:Only because I proofread as part of my job:
"horzion" should be "horizon".
http://en.wikipedia.org/wiki/Horizon wrote:
<<The horizon (Ancient Greek ὁ ὁρίζων, from ὁρίζειν, "to limit") is the apparent line that separates earth from sky. It is the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not. At many locations, the true horizon is obscured by trees, buildings, mountains, etc., and the resulting intersection of earth and sky is called the visible horizon. When looking at a sea from a shore, the part of the sea closest to the horizon is called
the offing.
- Offing: 1. The part of the sea that can be seen from the shore and is beyond the anchoring area;
"there was a ship in the offing".
2. The near or foreseeable future; "there was a wedding in the offing".
The straight line of sight distance d in kilometers to the true horizon on earth is approximately
d = sqrt(13h) where h is the height above ground or sea level (in meters) of the eye of the observer.>>
---------------------------------------------
Burj Khalifa in Dubai is the tallest man-made structure ever built, at
828 m., with the highest outdoor observation deck in the world at 442 m.
d = sqrt(13*442) = 76 km.[quote="Tripp"]Only because I proofread as part of my job:
"horzion" should be "horizon".[/quote]
[quote=" http://en.wikipedia.org/wiki/Horizon"]
<<The horizon (Ancient Greek ὁ ὁρίζων, from ὁρίζειν, "to limit") is the apparent line that separates earth from sky. It is the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not. At many locations, the true horizon is obscured by trees, buildings, mountains, etc., and the resulting intersection of earth and sky is called the visible horizon. When looking at a sea from a shore, the part of the sea closest to the horizon is called [b]the offing[/b].
[list]Offing: 1. The part of the sea that can be seen from the shore and is beyond the anchoring area;
"there was a ship in the offing".
2. The near or foreseeable future; "there was a wedding in the offing".[/list]
The straight line of sight distance d in kilometers to the true horizon on earth is approximately
[b]d = sqrt(13h)[/b] where h is the height above ground or sea level (in meters) of the eye of the observer.>>[/quote]---------------------------------------------
[url=http://asterisk.apod.com/viewtopic.php?f=23&t=17927&p=115689#p115689][b]Burj Khalifa[/b][/url] in Dubai is the tallest man-made structure ever built, at
828 m., with the highest outdoor observation deck in the world at 442 m.
[b]d = sqrt(13*442) = 76 km.[/b]