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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "In astronomy, the variation of the Moon is one of the principal perturbations in the motion of the Moon.The variation was discovered by Tycho Brahe, who noticed that, starting from a lunar eclipse in December 1590, at the times of syzygy (new or full moon), the apparent velocity of motion of the Moon (along its orbit as seen against the background of stars) was faster than expected. On the other hand, at the times of first and last quarter, its velocity was correspondingly slower than expected." ] ,
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