Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 58
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 ( I 795-1874) (Peter Andreas Hansen itas one of the greatest mathematicalastronomers of the \qtli 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, a?id the ships ofall nations guided. Twice…
Astronomy
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