Six months in Ascension : an unscientific account of a scientific expedition /
Gill, Isobel,1848-1919.
Gill, David,1843-1914.
London : John Murray,
1878.
An account of Isobel Sarah Black Gill's life on Ascension Island, with her husband, Scottish astronomer Sir David Gill (1843-1914). The purpose of this 1877 expedition was to measure the solar parallax - the distance between the Earth and the Sun - by observing Mars, which was then the closest to Earth than it had been for a century. In his introduction to his wife's book ,David Gill details the various historical attempts to measure the parallax.
NLS copy includes 24 pages of advertisements: Mr Murray's list of theological and religious publications.