Visual perspective

  • #1
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Main Question or Discussion Point

Supposed there is a tree on a perfectly flat plane. If an observer in front of that tree moves further and further away from the tree, the tree would look smaller and smaller. When the observer moves further and further away, would the lower part of the tree's trunk seem to disappear as if sinking below the horizon?
 

Answers and Replies

  • #2
Doug Huffman
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No. Why would it?
 
  • #3
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A person claimed that it does and that he had observed it before, on Earth though. These are his illustrations:

fig74.jpg


fig76.jpg


fig78.jpg


fig79.jpg


fig80.jpg
 
  • #4
Doug Huffman
Gold Member
804
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Earth is curved, an oblate spheroid.
 
  • #5
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In more words, what Doug is telling you is that YOU were the one that specified a condition of a perfectly flat surface, thus, there is no such thing as a horizon. So, what is it? a flat surface or an sphere...please state your problem correctly and fully form the beginning.
 
  • #6
Doug Huffman
Gold Member
804
110
In Nathaniel Bowditch's American Practical Navigator is listed a most useful thumb-rule for estimating the distance to the horizon for practical heights of eye.
 

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