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ecliptic longitude
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The modern definition of the new moon occurs “when the Moon and Sun are at the same geocentric ecliptic longitude,” explains NASA’s Scientific Visualization Studio on its website.
From Fox News
“By the modern definition, New Moon occurs when the Moon and Sun are at the same geocentric ecliptic longitude. The part of the Moon facing us is completely in shadow then,” explains the space agency’s Scientific Visualization Studio on its website.
From Fox News
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