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Blog post: swansont: A Stitch in … Photoshop

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Why does the Milky Way look curved?

 

Let me pose the following question to you:

 

How is it possible to get two points in the sky — 180 degrees apart — into the same image?

 

It’s
not
possible, not unless you distorted something along the way! In this case, we had to distort the composite, stitched-together image in order to display the entire path with a flat horizon! This is a complicated task, similar to the reason why it’s impossible to make a flat map of a sphere that simultaneously has all the properties you’d desire!

 


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