Lunar eclipse. Historical artwork of the mechanism of a lunar eclipse. The Sun is at bottom, with the Earth at centre. The Moon (seen in four positions above the Earth) is seen passing into the shadow cast into space by the Earth. The appearance of the eclipse depends on how near the Moon is to the Earth at the time, which is illustrated by the two positions of the Moon in the cone of shadow. This illustration was taken from Astronomica Institutio by the Dutch astronomer Jan Luyts, published in 1692.
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