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 237
; and it was bya comparison of elements principally deduced fromhis observations in that year, and Apians in 1531, thatHalley identified these comets with the one ob-served by himself in 1682. Two other comets have periods a little shorter thanHalleys, but their history cannot be traced fartherback…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
