Rev.Dr.G.U., Pope (17 திசம்பர் 2023). "திருக்குறள்". Tamil Virtual University.
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Optionally capitalised, Heliocentrism or heliocentrism, according to The Shorter Oxford English Dictionary (6th ed., 2007). The term is a learned formation based on GreekἥλιοςHelios "Sun" and κέντρονkentron "center"; the adjective heliocentric is first recorded in English (as heliocentrick) in 1685, after Neo-Latinheliocentricus, in use from about the same time (Johann Jakob Zimmermann, Prodromus biceps cono ellipticæ et a priori demonstratæ planetarum theorices, 1679, p. 28).
The abstract noun in -ism is more recent, recorded from the late 19th century (e.g. in Constance Naden, Induction and Deduction: A Historical and Critical Sketch of Successive Philosophical Conceptions Respecting the Relations Between Inductive and Deductive Thought and Other Essays (1890), p. 76: "Copernicus started from the observed motions of the planets, on which astronomers were agreed, and worked them out on the new hypothesis of Heliocentrism"), modelled after German Heliocentrismus or Heliozentrismus (c. 1870).
