In 1857, in what we would now call his gap year, a 20-year-old American, Henry Draper, arrived at Birr Castle where the third Earl of Rosse had erected the world’s largest telescope, the 72-inch Leviathan.
Seventeen years earlier, Draper’s father had made the first-ever photograph of the face of the moon.
His son’s experiences at Birr determined him to exploit photography for astronomical purposes, building his own observatory on his father’s estate...
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