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Describe the relative positions of the sun, moon, and Earth during a lunar eclipse and during a solar eclipse. At what phase of the moon does each occur, and why don't eclipses occur every month?

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  1. During a solar eclipse: the moon is between the earth and sun.

    During a lunar eclipse: the earth is between the sun and moon.

    Both occur during full moon.

    Eclipses don't occur every month because the moon's orbital path is tilted so that the three bodies don't always align in a straight line. Eclipses can only happen if the three bodies are in a straight line (or at least close to a straight line, in which case there would be a partial eclipse).


  2. During a Lunar Eclipse the Earth is directly between the Sun and the Moon.

    During a Solar Eclipse the Moon is directly between the Sun and the Earth.

    A Lunar Eclipse happens during a Full Moon.

    A Solar Eclipse happens during a New Moon.

    Eclipses do not occur every month because the Moon's orbit is tilted relative to the line between the Sun and the Earth.  Most months the Moon is too far above or below the direct line between the Sun and the Earth, so that the shadow cast by the Moon passes above or below the Earth, and the shadow of the Earth passes above or below the Moon.

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