Jean-François Callet (25 October 1744 – 14 November 1798) was a French professor of mathematics who wrote an influential book of logarithm tables and taught spherical trigonometry and navigation.
Callet was born in Versailles and became a professor of hydrographic engineering.
[1] Callet's most influential work was a portable table of logarithms (based on the work of William Gardiner) Tables Portatives de Logarithmes published in 1795 which went into many editions until 1906.
[2][3] It was influential and led to other improved logarithm tables such as those of Edward Sang.
It was made in collaboration with instrument maker Jean François Richer who was attempting to create a navigation instrument called the trigonometric circle or Compas Trigonométrique in his application for the Abbe Raynal Prize which sought a reliable and accurate method for the reduction of the apparent to the true distance between two stars.