Reflecting Circle
A reflecting circle, used to measure longitude by calculating the distance between the moon and a nearby star. German astronomer Johann Tobias Mayer developed the device, which was improved upon by French physicist Jean-Charles Borda in the 1780s
Picture No
10799426
Media ID
47599870
Size
3783px x 2457px
(2.8MB)
Credit
©Photo Researchers / Mary Evans Picture Library
Source
Photo Researchers
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Astronomical Borda Diagram Longitude Mayer Reflecting
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