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a fraction of a second ... but usually a single day (or night) it's close enough.

But it looks full for about 3 days

technically, a full moon represents the instant that the moons shadow completely disappears because of it's alignment with the earth and the sun. This is known as a lunar phase. On average, humans can not determine the exact moment this lunar phase occurs without the aid of a telescope. Therefore, the full moon appears to remain full for a period of 36 hours - 18 hours before this lunar phase and 18 hours after - to the naked eye.

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16y ago

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