Originally posted by Bobby-Joe
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Now back to light and dark; light bends in gravity. Right? I assume you know about gravitational lensing as an example of gravity bending light? Well if the world were round like you Geosphereist seem to think the light would just bend around the round earth and it would always be light. Only a flat earth would stop this from happening.
Do the math:
phi = 4GM / c2R, where "phi" is the angle of deflection, G - gravitational constant, "c" - speed of light in vacuum, R - radius.
For the Earth:
phi = 4*6.67*10^(-11)*5.97*10^24 / 9*10^16*6.37*10^6 ~= 2.79*10(-9) radians or 5*10-7 degrees.
I.e. the Earth can bend sunlight at the sea level by 0.00000007 degrees. That's a little bit different from the required 90 degrees.
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