On this day in 1799 – March 19th – the English physician, clergyman and astronomer William Rutter Dawes was born in London.

Dawes is probably best known for the Dawes' Limit, the formula he devised to determine the theoretical limit of the resolving power of a telescope. For his research into double stars the Royal Astronomical Society presented him with their Gold Medal in 1855.

Mona Evans
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