This sun diagonal was used at Sydney Observatory as part of a major international project aimed at mapping the stars. A sun diagonal is a device that allows users to directly view the sun in white light without causing injury to their eyes. The prism reflects only a small percentage of the sun’s light up through the eyepiece. Around 95 % of the light and heat are directed out through the bottom of the device.
The sun diagonal is commonly known as a ‘Herschel Wedge’. William Hershel (1738-1822)...
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