On this day in 1512 - March 5th - Gerardus Mercator was born.
Mercator was a German-Flemish cartographer, geographer and cosmographer. He created the 1569 world map based on a new projection that represented sailing courses of constant bearing as straight linesâ€”an innovation that is still employed in nautical charts.
On this day in 1787 - March 6th - Joseph Fraunhofer was born.
Fraunhofer was a German optician who was known for the quality of his optical glass and excellent telescope objectives. His name is still known today for his discovery of the dark absorption lines - known as Fraunhofer lines - in the Sun's spectrum.
Son of the discoverer of Uranus, John Herschel was one of the 19th century's most distinguished individuals. He was a brilliant mathematician, chemist and astronomer, as well as an accomplished artist, musician and linguist.
On this day in 1837 - March 7th - Henry Draper was born.
Henry Draper was a pioneer of astrophotography. Following his early death, his wife Anna donated money to Harvard College Observatory to complete his catalogue of stellar spectra. If you see a deep sky object named with an â€œHDâ€ prefix, it refers to this catalogue.
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