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Updated: May 26, 2025
"He determined," says Delambre, "the position of the stars by right ascensions and declinations; he was acquainted with the obliquity of the ecliptic.
On this account, I delineated the figures of many of these new constellations, especially of the largest, and took their declinations on the tracks which they describe around the south pole, together with the measurement of the diameters and semidiameters of their tracks, as shall be found in the history of my four voyages which I am preparing for publication.
It is a splendid instrument, with an object lens of, say, eight or nine inches aperture, mounted with its axis parallel to the earth's axis, and fitted up with graduated circles for denoting right ascensions and declinations; besides having special eye- pieces, a finder, and all sorts of appliances clock-work to make the telescope follow the motion in right ascension I cannot tell you half the conveniences.
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