Question about high resolution photos of the sea horizon

That would be an elegant, but yet just another way to see distortion of the lense with unkown magnitude and not the real curvature. I am still searching for an easy round earth prove that everyone can do without high cost and that cannot be debunked. The horizontal curvature near see level isn't one, unfortunately. Maybe it will be future, with even better cameras.

A few I know of:

• Watch a sunset. For added confirmation then call up someone you trust living in another part of the world to confirm that they still have the sun up.
  There is simply no way for this to happen on a FE.
• Observe the curvature in the direction that is easily demonstrable, that of going away from you. Observe the behaviour of objects as they approach the horizon, pass it and disappear from the bottom up. You can do this with a building as you move away, taking photos as you go which clearly show the building sinking.
• If you can find a straight row of objects of equal elevation which stretches back far enough, then go to a high viewpoint and observe how these objects appear to curve downwards
• One I like that I am yet to try, get 2 cameras held back to back so they are 180 degrees apart. Then point one due north (so the other is due south) and angle it against your latitude so it should be parallel to the equator. e.g. if you are at 60 degrees north, then you angle it so the due north one is pointing up 60 degrees, if you are 30 degrees south, angle it so the due south facing one is pointing up 30 degrees. Now take a timelapse photo of the night sky. Assuming your latitude isn't too extreme, you will see the stars circling a central point in each camera. Again, this is impossible on a FE (for it to be able to occur anywhere)
• Construct a water level, i.e. 2 vertical tubes connected at their top and bottom with horizontal tubes, with the entire apparatus sealed except potentially a small hole at the middle of the top tube. Have it half filled with water. Now hold it out so the 2 tubes are almost in a straight line and make sure the 2 water levels are aligned with your eye level and then compare that to the horizon. Now change your elevation and see how it varies.

Quote from: Souleon on May 06, 2019, 04:32:24 AM

That would be an elegant, but yet just another way to see distortion of the lense with unkown magnitude and not the real curvature. I am still searching for an easy round earth prove that everyone can do without high cost and that cannot be debunked. The horizontal curvature near see level isn't one, unfortunately. Maybe it will be future, with even better cameras.

A few I know of:

• Watch a sunset. For added confirmation then call up someone you trust living in another part of the world to confirm that they still have the sun up.
  There is simply no way for this to happen on a FE.
• Observe the curvature in the direction that is easily demonstrable, that of going away from you. Observe the behaviour of objects as they approach the horizon, pass it and disappear from the bottom up. You can do this with a building as you move away, taking photos as you go which clearly show the building sinking.
• If you can find a straight row of objects of equal elevation which stretches back far enough, then go to a high viewpoint and observe how these objects appear to curve downwards
• One I like that I am yet to try, get 2 cameras held back to back so they are 180 degrees apart. Then point one due north (so the other is due south) and angle it against your latitude so it should be parallel to the equator. e.g. if you are at 60 degrees north, then you angle it so the due north one is pointing up 60 degrees, if you are 30 degrees south, angle it so the due south facing one is pointing up 30 degrees. Now take a timelapse photo of the night sky. Assuming your latitude isn't too extreme, you will see the stars circling a central point in each camera. Again, this is impossible on a FE (for it to be able to occur anywhere)
• Construct a water level, i.e. 2 vertical tubes connected at their top and bottom with horizontal tubes, with the entire apparatus sealed except potentially a small hole at the middle of the top tube. Have it half filled with water. Now hold it out so the 2 tubes are almost in a straight line and make sure the 2 water levels are aligned with your eye level and then compare that to the horizon. Now change your elevation and see how it varies.

1. In FET they describe a spot light sun, so it is also bright and dark at different times.
2. FEB claim that's because of perspective, however in detail this doesn't make sense at all.
3. Yes, like the image Rabinoz posted, very clear and impressive. But it's like point 2, isn't it.
4. That's nice, so that is basically seeing both sides of the RE rotation axis at once. But you know, that can be explained by the mysterious "celestial gears" in FET....
5. But you need quite large differences in the altitude for this, don't you?

1. In FET they describe a spot light sun, so it is also bright and dark at different times.
2. FEB claim that's because of perspective, however in detail this doesn't make sense at all.
3. Yes, like the image Rabinoz posted, very clear and impressive. But it's like point 2, isn't it.
4. That's nice, so that is basically seeing both sides of the RE rotation axis at once. But you know, that can be explained by the mysterious "celestial gears" in FET....
5. But you need quite large differences in the altitude for this, don't you?

1 - That might explain day and night, but not sunset and sunrise.
If it was a case of a spotlight sun only illuminating part of the sky then the sun would disappear while high in the sky rather than setting.
The only way for it to set is for it to go below ground level for you.
If Earth was flat, that means it goes below Earth and causes darkness for everyone. If Earth is round it simply means it is now above somewhere else.
2 & 3 - Yes, FEers claim it is because of magic perspective, which makes no sense at all. It is effectively no better than them just claiming Earth is flat to dismiss the evidence that shows it isn't.
4 - Celestial gears can explain having 2 axes, but not them always being 180 degrees apart. The latter part then boils down to simple geometry. For a FE, this requires 2 straight lines on a flat plane to intersect twice after a finite distance which is impossible. For a RE, it requires either 2 "straight" lines on a sphere to intersect twice after some finite distance, which is not only possible but assured; or it has these lines being parallel and covering a larger expanse of 3D space rather than being confined to a plane and intersecting at infinity.

This is relevant with onservation point. If you take the photo from downside you see it like this. If you observe it from upside then you see it like an U letter.