The moon is located between the sun and the earth during new moons and solar eclipses. While new moons occur monthly, solar eclipses are rare. This is because a solar eclipse only occurs:
  1. When the sun, the moon, and the earth are aligned in the same plane.
  2. During an equinox, when the earth's Northern and Southern Hemispheres receive equal amounts of sunlight.
  3. When the moon's elliptical orbit brings it closest to the earth.
  4. During the summer solstice, when the earth's Northern Hemisphere is tilted toward the sun.
Explanation
Correct Response: A. A solar eclipse, as seen from the earth, occurs only when the moon passes between the sun and the earth and all three are on the same plane, causing the sun to seemingly disappear and the daytime sky to darken. A solar eclipse does not occur only during the vernal or autumnal equinox (B), when the moon's orbit is closest to the earth (C), or during the summer solstice (D).
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