/u/Clevererer's posts in /r/askscience

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At noon on Dec. 21 a beam of sun shines through a window. It lights up spot X on the center of an adjacent wall. We know the Lat-Lon and elevation of the window and wall. Can we predict where on the wall the sunlight would strike for any given time and day of the year? With what degree of precision?

56 upvotes

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Are there any fabrics that act similar to one-way mirrors? Not necessarily reflective, but just blocking more/most light coming from one direction.

3 upvotes

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How would this be made?

1 upvotes

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If I use a cable to bend a 15' vertical thin metal pipe into a slight bow shape, and secure it upright only at the base, could that otherwise bendable pipe be strengthened against a horizontal load at the very top?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
At noon on Dec. 21 a beam of sun shines through a window. It lights up spot X on the center of an adjacent wall. We know the Lat-Lon and elevation of the window and wall. Can we predict where on the wall the sunlight would strike for any given time and day of the year? With what degree of precision?	56
Are there any fabrics that act similar to one-way mirrors? Not necessarily reflective, but just blocking more/most light coming from one direction.	3
How would this be made?	1
If I use a cable to bend a 15' vertical thin metal pipe into a slight bow shape, and secure it upright only at the base, could that otherwise bendable pipe be strengthened against a horizontal load at the very top?	1