In existographies, Ecphantus (c.530-460BC) (IQ:175|#225) was a Greek physicist, astronomer, and philosopher, supposedly a Pythagorean, noted for his earth-as-wheel rotation theory (compare: Heraclides), for some type of early atomic theory, wherein he employed a motive force in addition to atoms and void, and declared that monads of Pythagoras were corporeal; first-slating: 175|#225 (Jan 2019).

Quotes | On
The following are quotes on Ecphantus:

Earth rotation theory
A mock diagram of Ecphantus' earth rotation theory, according to which the earth rotates like a wagon wheel, and this explains the apparent motion of the stars.
Anaximander stated that the earth was like a column, Leucippus, a cylinder or war drum; Cleanthes, a cone or top; Heraclitus, a boat-shaped vessel; Democritus, a concave disc; Anaximenes and Empedocles, etc., a level table. Thereafter, Parmenides and Epicurus came nearer actual fact, as did Heraclitus, Ponticus, and Ecphantus. The former believed that the earth was round like a ball, while the latter not only attributed the shape of a sphere to the earth, but also some movement, albeit not such that it could move forward and change place, however, as a wheel does.”
Otto Guericke (1672), New Magdeburg Experiments on the Vacuum of Space [1]

“All authorities agree that Heraclides of Pontus affirmed the daily rotation of the earth about its own axis; but the Doxographi associate with this discovery another name, that of ‘Ecphantus the Pythagorean’. Thus, we are told of Ecphantus that he asserted that ‘the earth, being in the centre of the universe, moves about its own centre in an eastward direction’ (Hippolytus, c.210). Again, ‘Heraclides of Pontus and Ecphantus the Pythagorean make the earth move, not in the sense of translation, but by way of turning as on an axle, like a wheel, from west to east, about its own centre’ (Aetius, c.100). Who then is this Ecphantus, described in another place in Aetius as Ecphantus the Syracusan, one of the Pythagoreans? His personality is even more of a mystery than that of Hicetas. The Doxographi, however, tell us of other doctrines of his; Hippolytus devotes a short paragraph to him, between paragraphs about Xenophanes and Hippo, which shows that Theophrastus must have spoken of him at length. Some of his views were quite original, particularly on the subject of atoms. Holding that the universe was made up of indivisible bodies separated by void, he was the first to declare that the monads of Pythagoras were corporeal; he attributed to the atoms, besides size and shape, a ‘motive force’ (δνυαμις); the atoms were moved, not by their weight or by percussion, but by a divine force which he called mind and soul. The universe was a type of this, and accordingly the divine motive force created it spherical.”
— Thomas Hearth (1913), Aristarchus of Samos, the Ancient Copernicus (pg. 251)

References
1. Guericke, Otto and Schott, Kaspar. (1672). Otto Guericke’s New Experiments: on (as they are called) on the Magdeburg vacuum space (Ottonis De Guericke Experimenta Nova (ut vocantur) Magdeburgica de Vacuo Spatio) (15+ diagrams, various pages) (preface, pdf) (pg. 3). Janssonius a Waesberge.

External links
‚óŹ Ecphantus – Wikipedia.

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