Galileo`s Moon

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Galileo`smoon refutes the smooth moon of Aristotle

Thepoem, translated from Spanish, unfolds as a list of the various waysthe moon has been described. A long, complex sentence relates all theprevious repetitions.Asecond shorter sentence isolates the image of another moon (Galilei,2013). The poem’s prose contains the covering of the night sky fromwhich the new apprehension reflects the vision of an independentwitness who is the speaker.

Torefute is to prove something wrong using evidence or by mereargument. During Galileo’s time, science based entirely onAristotle’s teachings who argued that heavenly body, the mooninclusive, were perfectly spherical. Dark spots that appeared on themoon were explained to be the part that absorbed and emitted lightuniquely from the sun. However, Galileo decided to study the moondeeply and therefore he pointed an improved telescope with amagnification of 20 times to the moon(Galilei,2013). He saw small dark spots on the moon’s illuminated surfacetogether with similar lighter spots in the dark area. As time wentby, the spots changed to being lighter and finally disappearing orbecoming darker and more different. The boundary between the dark andlight sides was uneven and rough.

Fromthis observation, Galileo established that the surface of the mooncontained plains, valleys, and mountains. It was not crystal-smoothas alleged by Aristotle. The dark spots are as a result of shadowsthe valleys and mountains cast when the sun fell on them (Bosman,2013).When the moon changes position about the sun, the intensities andshapes of the shadows also change. Through this, his theory waseventually accepted leading to the refusal of Aristotle’s one.


Bosman,J. (2013). Starry, Starry, Starry Night. Retrieved March 21, 2016,from

Galilei,G. (2013). TheSidereusNuncius.Firenze: Sansoni.