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Earth's second moon. Artwork of Earth's hypothetical second moon (sometimes called Lilith), during an eclipse by the first Moon. The second moon's existence was first suggested by French astronomer Frederic Petit after unconfirmed sightings on 21 March 1846. In 1898 German astronomer Georg Waltemath claimed that the second moon was 1.03 million kilometres (km) from Earth, had a diameter of 700 km (compared to the Moon's diameter of 3480 km), and orbited every 119 days. An object this size would be easily visible and would perturb the motion of Moon and Earth. Some astrologers claim that the second moon is too dark to be seen, and in 1918 it was named Lilith by Sepharial.
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