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The Planetary motions very irregular as seen from the Earth

The Planetary motions very irregular as seen from the Earth.jpg The primary Planets never eclipse one anotherThumbnailsThe primary Planets never eclipse one anotherThumbnailsThe primary Planets never eclipse one anotherThumbnailsThe primary Planets never eclipse one anotherThumbnailsThe primary Planets never eclipse one anotherThumbnails
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The apparent magnitudes of the Planets continually change as seen from the Earth, which demonstrates that they approach nearer to it, and recede farther from it by turns. From these Phenomena, and their apparent motions among the Stars, they seem to describe looped curves which never return into themselves, Venus’s path excepted. And if we were to trace out all their apparent paths, and put the figures of them together in one diagram, they would appear so anomalous and confused, that no man in his senses could believe them to be representations of their real paths; but would immediately conclude, that such apparent irregularities must be owing to some Optic illusions.

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The Project Gutenberg EBook of Astronomy Explained Upon Sir Isaac Newton's Principles, by James Ferguson Published 1847
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