if you are six feet tall, how far to the horizon can you see?
365555
I assume you mean how far away is the horizon, which isn't quite what the wording of your question really asks.\n\nAnyway, it is a simple geometry question. Construct a triangle. One point is the center of the Earth, one point is at your eye and one point is at your horizon. The horizon is that place where your line of sight is tangent to the curved surface of the earth, which means that the angle between the line from your eye to the horizon and the line from the center of the Earth to the same point on the horizon is 90 degrees. So you have a right triangle. The hypotenuse is the line from your eye to the center of the Earth and it's length is the radius of the Earth plus your height. That length, squared, is the sum of the squares of the other two sides. One of those sides is the radius of the Earth and the other is the unknown distance to the horizon you are trying to find. Just do the algebra to solve for the third side, which is the distance to the horizon. I think it is about 20 kilometers for the average person.
8037
6 to 6 and a half inches.
466473
The answer to this all depends on how high your head is off the ground.\n\nThis is an excellent page where you can type in how tall you are, and it will tell you what the straight line distance to the horizon is, and the curved distance.\n\nhttp://newton.ex.ac.uk/research/qsystems/people/sque/physics/horizon/
736872
It's an optical illusion. When it's near the horizon there are points of reference within your field of vision so your brain can correctly assess the size of it whereas high in the sky, there's nothing for the brain to use to assess size.
246405
100 feet  -- 30.48 miles to horizon\n3000 feet -- 58 miles to horizon\n\nd = sqr(2*r*h)
544990
Well as far as a formula i can't help you there. i just happen to own a program that allows me to draw perfect shapes of any size and diminsion them accordingly (auto CADD). and at the top of your 300 ft house, or where ever it is that your measuring from the horizon at sea level is a tad over 21 miles away (21.20389 to be analy exact). first you must know the the earths circumfrance (i know i can't spell) which is 20,890,637 ft, next you have to know the distance you are away from the earth (which you do, 300 ft). now you have to know the formula for finding a line that intersects your hieght and crosses tangentally across the earths surface. know you have your triangle and apply the Pythagorean theorem. you have an answer.
388414
refraction from the atmosphere magnifies.  When the moon, or sun, is low on the horizon, you're looking through more of the atmosphere to see it.
20069
It depends a lot on how high above the water your eyes are and how tall the distant object is.\n\nThe radius of the Earth at the equator is 6378135 meters.  Assume your eyes are 2 meters above sea-level, and the distant object is at sea-level.\n\nYou have a right triangle, where the longer leg is the radius of the Earth, and the hypotenuse is 6378315 + 2.  The shorter leg is the distance to the horizon.\n\nThe distance to the horizon = √(6378317^2 - 6378315^2) = 5051 meters, or about 3 miles.\n\n\nIf the distant object is 2 meters above sea-level, then it'll disappear when it's another 3 miles past the horizon, or 6 miles from you.
170004
It is dependant on the curvature of the Earth to your hight above or below sealevel.\n\nHere is the dumbed down general answer pulled from the article below:\n\n"Suppose you're standing at the edge of the sea, with your toes at the waterline. Your eyes are about 1.5 meters above the sea.\n\nAs the resolution of the normal eye in broad daylight this dip is an easily visible angle. So, although the angle is small, it is hardly negligible, even for a naked-eye observer standing at the water's edge. Clearly, dip is an appreciable effect for all real-world observations. \n\nBefore considering a more realistic situation that includes refraction, notice that the dip of the Earth. The distance to the apparent horizon: about 2 1/3 nautical miles"
109056
5 feet, if I understand your question...
501968
1060 ft and 571 ft, respectively.\n\nLearn to do your own searches, it's much quicker.
932806
If it is for the same person then the results mean \n\nLeft Eye - You can see at 20 feet what an average person sees at 50 feet \nRight Eye - You can see at 20 feet what an average person sees at 300 feet \n\nYou need glasses.
1001818
see a minor distance creat such a difrnc, 10/10
1104238
It depends on how far up you are.  There is a longstanding myth that the Great Wall of China is the only manmade object visible from space. It and several variations on the theme are great fodder for water cooler arguments. In reality, many human constructs can be seen from Earth orbit.\n\nShuttle astronauts can see highways, airports, dams and even large vehicles from an Earth orbit that is about 135 miles (217 kilometers) high. Cities are clearly distinct from surrounding countryside, and that's true even from the higher perch of the International Space Station, which circles the planet at about 250 miles (400 kilometers) up. \n\nEgyptian pyramids have been photographed from space several times with standard digital cameras and high-powered lenses. The largest pyramid at Giza, on the outskirts of Cairo, is 745 feet (227 meters) wide and 449 feet (137 meters) tall.\n\nWith binoculars you can see ships on the ocean.
1129941
If you have 20/40 vision, it means that when you stand 20 feet away from the chart you can see what a normal human can see when standing 40 feet from the chart. That is, if there is a normal person standing 40 feet away from the chart and you are standing only 20 feet away from it, you and the normal person can see the same detail.
1153025
Bart,\nGood question bro, and the answer is fairly simple. As an aviator I've been from ground level to 35,000 ft and the reason why the horizon appears to be at eye level is something called 'Line of Sight'.\n\nThe earth is curved right? Well - to truly get a glimpse of the earths curvature your going to have to be well into the Stratosphere to notice that the horizon begins to go below your line of sight at those altitudes. Anything below that, the curve of the earth is going to intercept the angle at which you view it, and appear to be level at your level (the point where the earth's curve is in your 'Line of Sight'.\n\nHope this helped bro, take it easy out there.
586533
The defining line between our sky and outer space has been generally accepted to be around 50 miles above the earth. It was established during the first test flights in the 1940s by Chuck Yeager and Scott Crossfield, among others.