[2] She began working at the Paris Observatory in November 1908 as a trainee,[3] where she met Jacques Jean Trousset after he joined her team in January 1909.

[2][5] On 28 February 1912, Chandon was appointed aide astronome et attachée at the Paris Observatory, effective from 1 March, and the appointment made her the first professional female astronomer in France.

[6] Chandon represented the Paris Observatory at the Fête du Soleil, organised by the Société astronomique de France, at the Eiffel Tower on 22 June 1914.

[7] In March 1930, Chandon defended her thesis "Research on the tides of the Red Sea and the Gulf of Suez",[8] where she shows that the tides of the Red Sea and Gulf of Suez are examples of standing waves.

[2][note 1] On 17 May 1943, the French Academy of Sciences proposed four candidates to the Minister of National Education for positions as titular astronomers of Paris Observatory, including Chandon.