A physicist and an inventor, Jules Janssen (1824-1907) devoted
his life to astronomical research. He spent many years traveling
around the world to observe total Solar eclipses, demonstrating
that a new era of science had just come thanks to the use of both
spectroscopy and photography, and persuading the French Government
of the necessity of founding a new observatory near Paris. He
became its director in 1875. There, at Meudon, he began routine
photographic recordings of the Sun surface and had a big refractor
and a big reflector built. Meanwhile, he also succeeded in building
an Observatory at the summit of Mont-Blanc.
The story of this untiring and stubborn globe-trotter is
enriched by extracts of the unpublished correspondence with his
wife. One can thus understand why Henriette often complained of the
solitude in which she was left by her peripatetic husband: There
are men who leave their wives for mistresses; you do it for
journeys ...
Basking in the glow of his success, Janssen was able to
undertake the construction of the great astrophysical observatory
of which he had dreamed. It was at Meudon that he had it
built."
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