carried out observations frequently in the early years, and include sketches that she made of Mars and Venus.

[3][4] Leonard also supervised the laboratory during Lowell's absences,[1] and accompanied him to Tacubaya, outside Mexico City, when the large Clark refractor was shipped there in 1896 for one of several oppositions of Mars that she would observe.

[5] In 1907, she published her drawings of Mars in Popular Astronomy with notes on the planet—its ice caps, Lowell's 'canals'— during some of the years when it was in opposition (1901, 1903, 1905).

[3] In 1904, Leonard was inducted into the Societé Astronomique de France, then an unusual honor for a woman.

[6] After Lowell's death in 1916, his widow, Constance, fired Leonard and she moved back to the eastern United States.