Q:

How many days does a full moon last?

A:

Quick Answer

According to NASA, a full moon technically only lasts for the moment when the Earth is directly between the sun and the moon. However, full moons appear to last for approximately three days.

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Full Answer

Over the course of approximately 28 days, the moon goes through different phases based on the relative positions of the Earth, the moon and the sun. A true full moon only occurs during the instant when the moon appears completely illuminated to observers on Earth. However, when most people talk about the full moon, they are referring to the several-day period when the moon appears to be at least 95 percent full.

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    When does the moon disappear?

    A:

    The moon is not visible to observers on Earth during its new moon phase, when the moon is located on the same side of Earth as the sun. During this phase, the portion of the moon that is illuminated by the sun faces entirely away from the Earth.

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    How much of the moon is always lit by the sun?

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    Why does the moon go through phases?

    A:

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