Question

when the moonand the sun were on the same side of the earth, the moon appeared as a full circle of light​

Answer 1

When the moon and sun are on the same side of the Earth it's called a lunar eclipse where the moon is in between the sun and the Earth hence blocking the view of the sun from the Earth. During lunar eclipse sun isn't visible and moon looks like a full circle of darkness whereas the moon looks like a full circle of light everynight because it reflects sunlight.

Answer 2

Answer:

this phenomenon is called lunar eclipse

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