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Homework Statement
Hello, I have a little problem with this figure, this is not an assignment or something else I just don't understand how we can find that d∅=g_{o}cos^{3}(α)/c² *dz
Homework Equations
g_{o}=G*M/R² with R the sun's radius
The Attempt at a Solution
I wrote all what I can deduce
g_{e}=gr*cos(α)
r=R/cos(α)
dt=dz/c
tg(∅)≈∅= R/dz
tg(α)=z/R
Please I really need to understand this
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