Throughout the year, the Moon's orbital tilt remains fixed with respect to the stars, meaning that it changes with respect to the Sun. But if that's the case, why do eclipses happen at all? The reason is that the Moon's orbit around the Earth is tilted relative to the Earth's orbit around the Sun. So why don't eclipses happen twice a month? Credit: NASA/Bill IngallsĪ lunar eclipse occurs when the Moon passes through the Earth's shadow, just as a solar eclipse occurs when part of the Earth passes through the Moon's shadow. From there, an observer during an eclipse would see all Earth's sunrises and sunsets at once.Ī composite of seven images shows the full Moon at perigee, or supermoon, during a total lunar eclipse on Sunday, Sept. This is because the only remaining sunlight reaching the Moon at that point is from around the edges of the Earth, as seen from the Moon's surface.
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