Six months in Ascension. An Unscientific Account of a Scientific Expedition. With a Map. 1 st ed.
Utgitt: London, Murray,
285 pp. + 24 p. ads. Publ.’s full brown cloth. Inner hinges broken, edges discoloured. Head and tail of spine frayed. Upper margin (2 mm.) waterstained throughout.
Kommentar: Rare. «In 1877 David Gill and his wife travelled … to measure the solar parallax by observing Mars. … He redetermined the distance to the sun to such precision that his value was used for almanacs until 1968.»