Janet Taylor (13 May 1804 – 25 January 1870) born Janet Ionn, was an English astronomer and navigation expert. During an active and highly successful life, she published various works on astronomy and navigation, founded an academy for the teaching of these subjects, and ran a warehouse focused on the distribution, production and repair of navigational instruments. Her Academy was highly regarded and recommended by the East India Company, Trinity House, and the Admiralty. In recognition of her work, she was awarded medals by the kings of Prussia and Holland, and her rule for calculating latitude from altitudes was described as "ingenious".
Taylor was one of the very few women working as a scientific instrument maker in London in the 19th century. Her "Mariner's Calculator", patented in 1834, was dismissed by the Admiralty. However, she was awarded a Civil List pension in 1860 "In consideration of her benevolent labours among the seafaring population of London".
- Lunar Tables for Calculating Distances
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