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Memoir of the Life and Labors of the Rev. Jeremiah Horrox Published online by Cambridge University Press: 05 August 2011
We have already spoken of the hour of the true conjunction in respect of the ecliptic, but as that was not the middle of the transit, nor was there shewn in it the nearest distance of the centres, it may perhaps be agreeable to some, though it is not otherwise of much use, to assign the true middle, together with the beginning and end, of so unusual and wonderful a conjunction. For this purpose, let a figure be drawn, such as No. 3 in the preceding plate, and let C be the Sun's centre; N the Northern node; E C N the ecliptic; I N the orbit of Venus; I the beginning of the transit; M the middle; F the end; V the true conjunction in respect to the ecliptic; C V the latitude of Venus at its true conjunction; C M the least distance of the centres in the middle of the transit; C N the distance of the node from the place of the true conjunction; E N I the visible inclination of the orbit of Venus to the ecliptic.
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