Thomas Street (also spelled Streete) (1621–1689) was an English astronomer, known for his writings on celestial motions. He has sometimes been confused with Thomas Street the judge, who lived from 1626 to 1696. The crater Street on the Moon is named after him.

Life According to Brief Lives by Street's contemporary John Aubrey, Street was born at Castle Lyons in Ireland on 5 March 1621, and died "in Chanon-row (vulgarly Channel-rowe) at Westminster, 17 August 1689, and is buried in the church yard of the new chapell there".

Astronomy On 3 May 1661 Streete observed a transit of Mercury from Long Acre in London with Nicholas Mercator and Christiaan Huygens. Streete subsequently disputed Hevelius's observation of this event. The same year also saw Streete publishing Astronomia Carolina, a new theorie of Coelestial Motions. An Appendix to Astronomia Carolina (including tables) followed in 1664. Astronomia Carolina was widely read, and used by students who later became very notable in their own right, e.g. Isaac NewtonSee e.g. D. T. Whiteside, Before the Principia, in Journal for the History of Astronomy 1 (1970), 5–17, p. 7. and John Flamsteed.According to Encyclopædia Britannica, 1823 version, article on John Flamsteed, p. 666. It was from Astronomia Carolina that Flamsteed learned how to calculate eclipses and planetary positions. Street's tables in Astronomia Carolina had a reputation for accuracy: for example, Flamsteed once referred to them as "the exactest tables in being, the Caroline",Letter from J. Flamsteed to Lord Brouncker (President of the Royal Society), on 24 November 1669. See Correspondence of John Flamsteed, vol. 1, ed. E. G. Forbes et al., 1997, letter #5, pages 12–26. and Astronomia Carolina itself appeared in second and third editions as late as 1710 and 1716.For copies in British Library, see online catalogue.

1674 saw the appearance of Street's Description and Use of the Planetary Systeme together with Easie Tables, as well as, in the same year, Tables of Projection for artillery, accompanying a work on gunnery by Robert Anderson.

A follower of Johannes Kepler, Street argued, like Kepler, that Earth's velocity in its annual revolution around the sun is not uniform. He argued that the velocity increases as it approaches the Sun, and decreases as it moves away.University of Florida > Robert A. Hatch > Between Friends: Huygens & Boulliau

Other achievements Street invented an improved back-staff, a modification of an earlier instrument by Robert Hooke, adding to the device two planes and a small mirror.Saverien's article on the 'quartier anglois' (back-staff), in Dictionnaire universel de mathematique, Paris, 1753.

Personality

One of Street's pamphlets described how he engaged in a vigorous polemic with Vincent Wing, his astronomical competitor, who had published a criticism of Street's Astronomia Carolina.Examen Examinatum, or Wing's Examination of Astronomia Carolina examined ... with a Castigation of the Envy and Ignorance of Vincent Wing, by Thomas Street, Student in Astronomy and Mathematics ... London, 1667.

Edmond Halley (1656–1742), Street's much younger contemporary, wrote of Street as his 'good friend' (according to Halley's biographer), and said that they had observed a lunar eclipse together.Alan Cook, "Edmond Halley", Oxford, 1998, p. 66. Halley wrote an appendix to the 1710 edition of Street's Astronomia Carolina, and Cajori (op. cit.) said that Halley actually 'brought out' that 1710 edition.

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