On this day in 1858 - June 2nd - Giovanni Battista Donati first observed the comet that bears his name.
Comet Donati, formally designated C/1858 L1 and 1858 VI, was one of the most brilliant comets of the 19th century. It inspired artists and poets and was also the first comet to be photographed, though the photograph has apparently been lost.
On this day in 1819 - June 5th - British mathematician and astronomer John Couch Adams was born.
His most famous achievement was predicting the existence and position of Neptune, using only mathematics. But Urbain LeVerrier had independently made the calculations and the planet was discovered using LeVerrier's calculations. (Who discovered Neptune?)
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