Labels:text | font | paper | black and white | document OCR: 1873 Born on October 8 in Frederiksberg, Denmark. 1898 Graduates from the Polytechnic of Frederiksberg in chemical engineering and then moves to St. Petersburg, Russia, where he works as a chemical engineer. 1901 Returns to Copenhagen, the Danish capital, and studies photochemistry. He then starts work as a private astronomer at the University of Copenhagen Observatory and the Urania Observatory at Frederiksberg. 1905-07 Hertzsprung is interested in the use of photographic techniques in astronomy. He publishes two papers in a photographic journal where he describes the absolute magnitude and the color of a star. He also plots a graph (1906) of this relationship for stars in the Pleiades star cluster, but does not publish it. 1909 Becomes Assistant Professor of Astronomy at the University o ...
