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# Simple way to measure the earth's curvature.

 Posts: 1,112 Add as FriendChallenge to a DebateSend a Message 10/10/2016 6:06:57 PMPosted: 1 year agoThis is a fun and simple experiment that anyone can do, which will let you measure not only the curvature of the earth, but also its radius.1) Take a disc and glue a bead to its middle, and then take a string, make a tie in one end, then place it through the hole of the bead; hold this by the string, place it so that you can see neither its bottom nor its top, and give the disc a little spin; if you still can't see the top or bottom of the disc as it spins, then CONGRATULATIONS! You've just created an easy-to-use level, which you can compare the horizon to.2) Go somewhere high from whence a beach is clearly visible (should be above a mile for you to notice the curvature), and take note of your height; oh, and make sure you can access many slightly varying altitudes from that place, to mitigate the error.3) Hold the level such that neither its bottom nor top are visible, to create your point of comparison (the disc is where the horizon should be if the earth was a flat surface).4) By this point, you'll see that the actual horizon is slightly below the flat horizon, the angle between the two being the earth's curvature.If you want to calculate the earth's radius, do as follows:Take the angle you've measured between the two horizons, we'll call it "a" for now.Take the height above sea-level the point you're standing at is, we'll call it "h" for now.The earth's radius is (roughly) equal in meters to the following expression:2*h/(tan(a))^2 (h must be in meters for this to work.)Simple, right? I've done this a couple of times, and it was quite fun seeing the results.
 Posts: 6,557 Add as FriendChallenge to a DebateSend a Message 10/10/2016 6:11:48 PMPosted: 1 year agoAt 10/10/2016 6:06:57 PM, KthulhuHimself wrote:This is a fun and simple experiment that anyone can do, which will let you measure not only the curvature of the earth, but also its radius.1) Take a disc and glue a bead to its middle, and then take a string, make a tie in one end, then place it through the hole of the bead; hold this by the string, place it so that you can see neither its bottom nor its top, and give the disc a little spin; if you still can't see the top or bottom of the disc as it spins, then CONGRATULATIONS! You've just created an easy-to-use level, which you can compare the horizon to.2) Go somewhere high from whence a beach is clearly visible (should be above a mile for you to notice the curvature), and take note of your height; oh, and make sure you can access many slightly varying altitudes from that place, to mitigate the error.3) Hold the level such that neither its bottom nor top are visible, to create your point of comparison (the disc is where the horizon should be if the earth was a flat surface).4) By this point, you'll see that the actual horizon is slightly below the flat horizon, the angle between the two being the earth's curvature.If you want to calculate the earth's radius, do as follows:Take the angle you've measured between the two horizons, we'll call it "a" for now.Take the height above sea-level the point you're standing at is, we'll call it "h" for now.The earth's radius is (roughly) equal in meters to the following expression:2*h/(tan(a))^2 (h must be in meters for this to work.)Simple, right? I've done this a couple of times, and it was quite fun seeing the results.the argument would be you can only see so far, atmospheric distortion etc, though I never verified it or anything an example of this was, a boat that disappears off the horizon, hull first then mast can be seen with a telescope in it's entirety, so perhaps using ones vision isn't so good after all.
 Posts: 1,112 Add as FriendChallenge to a DebateSend a Message 10/10/2016 6:34:09 PMPosted: 1 year agoAt 10/10/2016 6:11:48 PM, kevin24018 wrote:At 10/10/2016 6:06:57 PM, KthulhuHimself wrote:This is a fun and simple experiment that anyone can do, which will let you measure not only the curvature of the earth, but also its radius.1) Take a disc and glue a bead to its middle, and then take a string, make a tie in one end, then place it through the hole of the bead; hold this by the string, place it so that you can see neither its bottom nor its top, and give the disc a little spin; if you still can't see the top or bottom of the disc as it spins, then CONGRATULATIONS! You've just created an easy-to-use level, which you can compare the horizon to.2) Go somewhere high from whence a beach is clearly visible (should be above a mile for you to notice the curvature), and take note of your height; oh, and make sure you can access many slightly varying altitudes from that place, to mitigate the error.3) Hold the level such that neither its bottom nor top are visible, to create your point of comparison (the disc is where the horizon should be if the earth was a flat surface).4) By this point, you'll see that the actual horizon is slightly below the flat horizon, the angle between the two being the earth's curvature.If you want to calculate the earth's radius, do as follows:Take the angle you've measured between the two horizons, we'll call it "a" for now.Take the height above sea-level the point you're standing at is, we'll call it "h" for now.The earth's radius is (roughly) equal in meters to the following expression:2*h/(tan(a))^2 (h must be in meters for this to work.)Simple, right? I've done this a couple of times, and it was quite fun seeing the results.the argument would be you can only see so far, atmospheric distortion etc, though I never verified it or anything an example of this was, a boat that disappears off the horizon, hull first then mast can be seen with a telescope in it's entirety, so perhaps using ones vision isn't so good after all.Well, if the day's clear, you will be able to do this; where I did the experiment I had pretty good vision.
 Posts: 6,557 Add as FriendChallenge to a DebateSend a Message 10/10/2016 6:52:41 PMPosted: 1 year agoAt 10/10/2016 6:34:09 PM, KthulhuHimself wrote:At 10/10/2016 6:11:48 PM, kevin24018 wrote:At 10/10/2016 6:06:57 PM, KthulhuHimself wrote:This is a fun and simple experiment that anyone can do, which will let you measure not only the curvature of the earth, but also its radius.1) Take a disc and glue a bead to its middle, and then take a string, make a tie in one end, then place it through the hole of the bead; hold this by the string, place it so that you can see neither its bottom nor its top, and give the disc a little spin; if you still can't see the top or bottom of the disc as it spins, then CONGRATULATIONS! You've just created an easy-to-use level, which you can compare the horizon to.2) Go somewhere high from whence a beach is clearly visible (should be above a mile for you to notice the curvature), and take note of your height; oh, and make sure you can access many slightly varying altitudes from that place, to mitigate the error.3) Hold the level such that neither its bottom nor top are visible, to create your point of comparison (the disc is where the horizon should be if the earth was a flat surface).4) By this point, you'll see that the actual horizon is slightly below the flat horizon, the angle between the two being the earth's curvature.If you want to calculate the earth's radius, do as follows:Take the angle you've measured between the two horizons, we'll call it "a" for now.Take the height above sea-level the point you're standing at is, we'll call it "h" for now.The earth's radius is (roughly) equal in meters to the following expression:2*h/(tan(a))^2 (h must be in meters for this to work.)Simple, right? I've done this a couple of times, and it was quite fun seeing the results.the argument would be you can only see so far, atmospheric distortion etc, though I never verified it or anything an example of this was, a boat that disappears off the horizon, hull first then mast can be seen with a telescope in it's entirety, so perhaps using ones vision isn't so good after all.Well, if the day's clear, you will be able to do this; where I did the experiment I had pretty good vision.the arguments I saw said it's because we don't have infinite vision is why the boat and telescope thing proves you can't use the naked eye, again don't know if it's true, but there's also an "experiment" with a laser and 2 board which I guess makes a straight line and if the earth is curved the height of the laser on the further away board should be higher but they say it's the same.
 Posts: 1,112 Add as FriendChallenge to a DebateSend a Message 10/11/2016 7:29:32 AMPosted: 1 year agoAt 10/10/2016 6:52:41 PM, kevin24018 wrote:At 10/10/2016 6:34:09 PM, KthulhuHimself wrote:At 10/10/2016 6:11:48 PM, kevin24018 wrote:At 10/10/2016 6:06:57 PM, KthulhuHimself wrote:This is a fun and simple experiment that anyone can do, which will let you measure not only the curvature of the earth, but also its radius.1) Take a disc and glue a bead to its middle, and then take a string, make a tie in one end, then place it through the hole of the bead; hold this by the string, place it so that you can see neither its bottom nor its top, and give the disc a little spin; if you still can't see the top or bottom of the disc as it spins, then CONGRATULATIONS! You've just created an easy-to-use level, which you can compare the horizon to.2) Go somewhere high from whence a beach is clearly visible (should be above a mile for you to notice the curvature), and take note of your height; oh, and make sure you can access many slightly varying altitudes from that place, to mitigate the error.3) Hold the level such that neither its bottom nor top are visible, to create your point of comparison (the disc is where the horizon should be if the earth was a flat surface).4) By this point, you'll see that the actual horizon is slightly below the flat horizon, the angle between the two being the earth's curvature.If you want to calculate the earth's radius, do as follows:Take the angle you've measured between the two horizons, we'll call it "a" for now.Take the height above sea-level the point you're standing at is, we'll call it "h" for now.The earth's radius is (roughly) equal in meters to the following expression:2*h/(tan(a))^2 (h must be in meters for this to work.)Simple, right? I've done this a couple of times, and it was quite fun seeing the results.the argument would be you can only see so far, atmospheric distortion etc, though I never verified it or anything an example of this was, a boat that disappears off the horizon, hull first then mast can be seen with a telescope in it's entirety, so perhaps using ones vision isn't so good after all.Well, if the day's clear, you will be able to do this; where I did the experiment I had pretty good vision.the arguments I saw said it's because we don't have infinite vision is why the boat and telescope thing proves you can't use the naked eye, again don't know if it's true, but there's also an "experiment" with a laser and 2 board which I guess makes a straight line and if the earth is curved the height of the laser on the further away board should be higher but they say it's the same.I don't really see your point; mind summing it up?
 Posts: 6,557 Add as FriendChallenge to a DebateSend a Message 10/11/2016 12:12:23 PMPosted: 1 year agoAt 10/11/2016 7:29:32 AM, KthulhuHimself wrote:At 10/10/2016 6:52:41 PM, kevin24018 wrote:At 10/10/2016 6:34:09 PM, KthulhuHimself wrote:At 10/10/2016 6:11:48 PM, kevin24018 wrote:At 10/10/2016 6:06:57 PM, KthulhuHimself wrote:This is a fun and simple experiment that anyone can do, which will let you measure not only the curvature of the earth, but also its radius.1) Take a disc and glue a bead to its middle, and then take a string, make a tie in one end, then place it through the hole of the bead; hold this by the string, place it so that you can see neither its bottom nor its top, and give the disc a little spin; if you still can't see the top or bottom of the disc as it spins, then CONGRATULATIONS! You've just created an easy-to-use level, which you can compare the horizon to.2) Go somewhere high from whence a beach is clearly visible (should be above a mile for you to notice the curvature), and take note of your height; oh, and make sure you can access many slightly varying altitudes from that place, to mitigate the error.3) Hold the level such that neither its bottom nor top are visible, to create your point of comparison (the disc is where the horizon should be if the earth was a flat surface).4) By this point, you'll see that the actual horizon is slightly below the flat horizon, the angle between the two being the earth's curvature.If you want to calculate the earth's radius, do as follows:Take the angle you've measured between the two horizons, we'll call it "a" for now.Take the height above sea-level the point you're standing at is, we'll call it "h" for now.The earth's radius is (roughly) equal in meters to the following expression:2*h/(tan(a))^2 (h must be in meters for this to work.)Simple, right? I've done this a couple of times, and it was quite fun seeing the results.the argument would be you can only see so far, atmospheric distortion etc, though I never verified it or anything an example of this was, a boat that disappears off the horizon, hull first then mast can be seen with a telescope in it's entirety, so perhaps using ones vision isn't so good after all.Well, if the day's clear, you will be able to do this; where I did the experiment I had pretty good vision.the arguments I saw said it's because we don't have infinite vision is why the boat and telescope thing proves you can't use the naked eye, again don't know if it's true, but there's also an "experiment" with a laser and 2 board which I guess makes a straight line and if the earth is curved the height of the laser on the further away board should be higher but they say it's the same.I don't really see your point; mind summing it up?if there's a curve at a certain distance there should be a drop, like the horizon thing, a laser is a straight beam so lets say you have 2 6 foot boards, at 4 miles away where the beam strikes the board should be one inch higher on the board than the one right next to it, provided it's parallel etc.have watched the whole thing yet https://youtu.be... but you can search using the title.
 Posts: 6,821 Add as FriendChallenge to a DebateSend a Message 10/11/2016 1:53:01 PMPosted: 1 year agoAt 10/10/2016 6:06:57 PM, KthulhuHimself wrote:This is a fun and simple experiment that anyone can do, which will let you measure not only the curvature of the earth, but also its radius.1) Take a disc and glue a bead to its middle, and then take a string, make a tie in one end, then place it through the hole of the bead; hold this by the string, place it so that you can see neither its bottom nor its top, and give the disc a little spin; if you still can't see the top or bottom of the disc as it spins, then CONGRATULATIONS! You've just created an easy-to-use level, which you can compare the horizon to.2) Go somewhere high from whence a beach is clearly visible (should be above a mile for you to notice the curvature), and take note of your height; oh, and make sure you can access many slightly varying altitudes from that place, to mitigate the error.3) Hold the level such that neither its bottom nor top are visible, to create your point of comparison (the disc is where the horizon should be if the earth was a flat surface).4) By this point, you'll see that the actual horizon is slightly below the flat horizon, the angle between the two being the earth's curvature.If you want to calculate the earth's radius, do as follows:Take the angle you've measured between the two horizons, we'll call it "a" for now.Take the height above sea-level the point you're standing at is, we'll call it "h" for now.The earth's radius is (roughly) equal in meters to the following expression:2*h/(tan(a))^2 (h must be in meters for this to work.)Simple, right? I've done this a couple of times, and it was quite fun seeing the results.Sounds like fun! What did you come up with? What were your calculations for the radius or diameter of the earth?This space for rent.
 Posts: 3,328 Add as FriendChallenge to a DebateSend a Message 10/12/2016 5:37:46 AMPosted: 1 year agohttps://youtu.be...Think you did it wrong, or more likely, not at all."Heck, I probably could have argued better for the flat earth- KthuluHimself" "Yes, I'm a pseudoscientists; I don't know what an experiment is"-Ramshutu Time is Running out http://www.npr.org...
 Posts: 3,328 Add as FriendChallenge to a DebateSend a Message 10/12/2016 5:43:22 AMPosted: 1 year agohttps://youtu.be..."Heck, I probably could have argued better for the flat earth- KthuluHimself" "Yes, I'm a pseudoscientists; I don't know what an experiment is"-Ramshutu Time is Running out http://www.npr.org...