1631 in science

none 1631 science 1631 The year 1631 in science and technology involved some significant events. Astronomy November 7 – Using Kepler's predictions of planetary transits made in 1630, Pierre Gassendi makes the first recorded observation of the transit of Mercury. The observed size of Mercury's disc is significantly smaller than had been expected from Ptolemaic theory. Geology December 16 – Volcanic eruption of Mount Vesuvius for the only time this century. Mathematics William Oughtred publishes Clavis Mathematicae, introducing the multiplication sign (×) and proportion sign (::).A History of Mathematics Florian Cajori Florian Cajori 1919 Macmillan https://archive.org/details/ahistorymathema02cajogoog 157 cajori william-oughtred multiplication.Helena Mary Pycior Helena Pycior Symbols, Impossible Numbers, and Geometric Entanglements: British Algebra through the Commentaries on Newton's Universal Arithmetick 1997 48 0-521-48124-4 Some of Thomas Harriot's writings on algebra are published posthumously as Artis Analyticae Praxis. Technology Earliest known bentside spinet, made by Hieronymus de Zentis.Hubbard, Frank (1967). Births approx. date William Ball, English astronomer (died 1690) Richard Lower, English physician, performs first direct blood transfusion (died 1691) Deaths October 20 – Michael Maestlin, German astronomer and mathematician (born 1550) October 26 – Catherine de Parthenay, French noblewoman and mathematician (b. 1554) December 10 – Sir Hugh Myddelton, Welsh-born goldsmith and hydraulic engineer (born c. 1560) References Category:17th century in science Category:1630s in science