Stars and telescopes; a hand-book of popular astronomy founded on the 9th ed. of Lynn's Celestial motions (1901)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911 · Boston, Little, Brown · leaf 52
he greatest practical use in navigation,thereby enabling the mariner to find his longitude atsea. The difficulty of this problem, which has exer-cised the labors of many distinguished mathemati-cians, arises from the perturbations to which theMoons elliptic motion round the Earth is… … HANSEN (1795-1874) (Peter Andreas Hansen was one of the greatest mathematicalastronomers of the 19th century. His tables of Sun and Moon,although now nearly a half century old, are still the basis of com-putation by which all timepieces are regulated, and Hie ships ofall nations guided. Twice he…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
