Henri-Alexandre Deslandres

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Henri-Alexandre Deslandres

Henri Alexandre Deslandres (24 July 1853 – 15 January 1948) was a French

Meudon and Paris Observatories, who carried out intensive studies on the behaviour of the atmosphere of the Sun
.

Biography

Deslandres' undergraduate years at the

Johann Balmer and were to catalyse the development of quantum mechanics
in the 20th century.

In 1868,

George Hale
.

In 1898, he joined Janssen at Meudon, increasing the scientific staff by 100%. On Janssen's death in 1907, Deslandres became director and embarked on a programme of expansion. Deslandres was the President of the Société Astronomique de France (SAF), the French astronomical society, from 1907-1909.[2] At the outbreak of World War I in 1914, though already in his 60s, he returned to active service in the engineers as a major and later lieutenant colonel. In 1918, following the armistice, he resumed his office at Meudon until 1926 when its administration merged with that of the Paris Observatory, Mouchez assuming the role of director of both institutions until his retirement in 1929.

He remained active in research right up until his death. Fellow astronomer Raymond Michard observed that In his bearing, his character and his style of life Deslandres always remained more akin to the soldier (and the officer) than to the scholar.

Deslandres at the Fourth Conference International Union for Cooperation in Solar Research at Mount Wilson Observatory, 1910

Honours

Awards

Named after him

References

External links

Obituaries