why do the sun the moon and earth not lie in one and the same line on every full moon day and new moon day

Dear student,

The moon orbits around the earth to form an orbit and the earth orbits around the sun to form another orbit.
If the two orbits coincides with each other, the sun, the moon and the earth will lie in a single line in full moon and new moon day.
But, the orbit of the earth is at an angle to the orbit of the moon, therefore, to lie in a single line, the two orbits needs to intersect, which happens sometimes in years and that causes the formation of the eclipse.

Hope this information helps,


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