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On December 17, a nearly full Moon will pass close to Mars in the evening sky. Both the Moon and Mars follow the same path across the stars, known as the ecliptic, due to their similar orbital alignment. On this special day, they will be remarkably close, only 1 degree apart, which is roughly twice the diameter of the Full Moon. By watching them in the early evening, you will witness the distance between the Moon and Mars change as the night progresses. Astronomy Magazine’s Dave Eicher invites readers to observe this remarkable celestial event. For stargazers, this alignment is a rare and impressive sight, offering a chance to appreciate the scale of our solar system and the majesty of our cosmic neighborhood.