Ismail Bouillaud (or Boulliau, or Bullialdus, 1605-1694)
French librarian, astronomer and priest, who was born in 1605 in Loudun
where he studied, then traveling in Italy, Holland and Germany for buying
books. Published Astronomia philolaica in 1645, supporting Kepler's
elliptical orbits, and assuming an inverse-square force law for the first
time.
He observed the Andromeda "Nebula" (M31)
in 1661, but according to Allen (1899/1963), he expressly
mentioned that this "Nebula" had been observed 150 years earlier by some
anonymous but expert astronomer.
Nevertheless, Edmond Halley accounted the discovery
of this object to him in his 1716 treat of Nebulae.
Because the "nebula" had not been documented by so many famous astronomers,
Boulliau suspected that it might been variable, similar to
Mira Ceti which
he also studied, and attempted to calculate a period of variation - of 333 days,
compared to the modern value of 332.
He died in 1694 in Paris.
References
- Halley, Edmond,
1716. An Account of several Nebulae or lucid Spots like Clouds,
lately discovered among the Fixt Stars by help of the Telescope.
Phil. Trans., Vol. 29 (1714-1716), Num. 347 (Jan-Mar 1716), p. 390-392.
- Allen, Richard Hinckley,
1899. Star-Names and their Meaning. G.E. Stechert. Republished
corrected in 1963 as Star Names, Their Lore and Meaning, Dover, New York.
Here: p. 39.
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Hartmut Frommert
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