Sundials - World's Oldest Clocks

North American Sundial Society

Transit of Venus - NASA

Venus Transit 2012 from the Solar Dynamic Observatory. The red colored sun is from the 304 angstrom ultraviolet, the golden colored sun is 171 angstrom, magenta at 1700 angstrom, and the orange sun is filtered visible light.

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Current Sun

Sundial = Civil + EoT

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