ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Transit of Venus. Artwork by Samuel Dunn of the 1761 Transit of Venus. This shows the 'black drop effect' where as Venus (black) gets closer to the limb of the Sun a shadowy bridge closes the gap between the two. This effect makes it hard to accurately determine the start and end of the transit.
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