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Encyclopedia Britannica



BAILY, FRANCIS (1774-1844)

This article appears in Volume V03, Page 221 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BAI-BAR
BAILY, FRANCIS (1774-1844) , English astronomer, was born at Newbury in Berkshire, on the 28th of April 1774. After a tour in the unsettled parts of North America in 1796-1797, his journal of which was edited by
Augustus
  de Morgan in 1856, he entered the London Stock Exchange in 1799. The successive publication of Tables for the Purchasing and Renewing of Leases (18o2), of The Doctrine of
Interest
  and Annuities (18o8), and The Doctrine of Life-Annuities and Assurances (181o), earned him a high reputation as a writer on life-contingencies; he amassed a fortune through
diligence
  and integrity and retired from business in 1825, to devote himself wholly to astronomy. He had already, in 1820, taken a leading part in the foundation of the Royal Astronomical Society ; and its gold medal was awarded him, in 1827, for his preparation of the Astronomical Society's Catalogue of 2881 stars (Memoirs R. Astr. Soc. ii.). The reform of the Nautical Almanac in 1829 was set on foot by his protests; he recommended to the British Association in 1837, and in
great
  part executed, the reduction of Joseph de Lalande's and Nicolas de Lacaille's catalogues containing about 57,000 stars; he superintended the compilation of the British Association's Catalogue of 8377 stars (published 1845); and revised the catalogues of Tobias Mayer,
Ptolemy
 , Ulugh Beg, Tycho Brahe, Edmund Halley and Hevelius (Memoirs R. Astr. Soc. iv., xiii.).
His notice of " Baily's Beads," during an annular eclipse of thesun on the 15th of May 1836, at Inch Bonney in Roxburghshire, started the modern
series
  of eclipse-expeditions. The phenomenon, which depends upon the inequalities of the moon's limb, was so vividly described by him as to attract an unprecedented amount of attention to the totality of the 8th of July 1842, observed by Baily himself at Pavia. He completed and discussed H. Foster's pendulum-experiments, deducing from them an ellipticity for the earth of 21q (Memoirs R. Astr. Soc. vii.); corrected for the length of the seconds-pendulum by introducing a neglected
element
  of reduction; and was entrusted, in 1843, with the reconstruction of the standards of length. His laborious operations for determining the mean density of the earth, carried on by Henry Cavendish's method (1838-1842), yielded for it the authoritative value of 5.66. He died in London, on the 3oth of August 1844. Baily's Account of the Rev. John Flamsteed (1835) is of fundamental importance to the scientific history of that time. It included a republication of the British Catalogue.
See J. Herschel's Memoir of F. Baily, Esq. (1845), also prefixed to Baily's Journal of a Tour, with a
list
  of his writings; Month. Not. R. Astr. Soc. xiv. 1844.


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