Có 4 chất điểm đặt ở các đỉnh của 1 hình vuông cạnh a. momen quán tính của hệ 4 chất điem

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr

snell's law

refractve index = sin incidence / sin refraction