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1914
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1880 July 30, David Gill, “Annual Address to the South African Philosophical Society”, in Transactions of the South African Philosophical Society, page xxxiii:[…] Delambre was at length provided with a mathematical theory of the movements of the satellites which he could compare with observation, and in so doing he was able to determine what is briefly called the light equation, that is, the time which light takes to traverse the mean distance of the earth from the sun.
1891, William Harkness, The Solar Parallax and Its Related Constants, Including the Figure and Density of the Earth, Washington: Government Printing Office, page 28:The time occupied by light in traversing the mean radius of the Earth's orbit is usually called the light equation, and there are but two determinations of it from the eclipses of Jupiter's satellites, […]
1914 August, Frank Schlesinger, “Spectrographic Observations of λ Tauri, Indicating the Presence of a Third Body in the System”, in Publications of the Allegheny Observatory of the University of Pittsburgh, volume 3, number 20, Lancaster, Pa.: New Era Printing, published 1916, page 175:By examining the latter from this point of view I have shown that the times of mid-eclipse are affected by a small term of precisely the character that the presence of a third body would imply, this term being like the light equation in the solar system and equivalent to the time that it takes light to traverse the larger orbit of Algol.