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Holographic sundial.

R Penland,R Cormack,J Carsten, S Sayhun,K M Johnson

Optics letters（1990）

Cited 2|Views5
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Abstract
A holographic sundial, to our knowledge the first sundial that does not use a gnomen or shadow-casting device, is designed and demonstrated. The accuracy of the device is measured and analyzed.
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Early Astronomical Instruments
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