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unpublished correspondence with his wife.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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