UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY
Parallax. Diagram of planetary parallax showing the apparent difference in the position of a body when measured from two different positions on Earth. Used to measure the distance of a body. From The Beauty of the Heavens by Charles F Blount (London, 1845). Coloured lithograph.
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