"As contrasted with an absolute number, a logistic number represented measurement. ...Kepler welcomed the invention of logarithms as an ingenious device to facilitate laborious computations. Since he was concerned principally with astronomical computations involving sexagesimal fractions of the degree and of the hour, logistic logarithms were of prime importance to him. ...Kepler's logarithms were based on proportion, as he made clear in the following definition of a logarithm in his Thousand Logarithms: "Express the measurement of every proportion between 1000 and a number smaller than 1000... by a number which is placed alongside this smaller number in the Thousand and which is called its logarithm, that is, the number (arithmos) indicating the proportion (logos) which that number, to which the logarithm is attached, bears to 1000.""
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Edward Rosen, Kepler's Somnium: The Dream, Or Posthumous Work on Lunar Astronomy (1967) p. 95
https://en.wikiquote.org/wiki/History_of_logarithms
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History of logarithms
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