Galileo Observed

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Galeleo - Astronomy - Venus, Saturn, and Neptune
... From September 1610, Galileo observed that Venus exhibited a full set of phases similar to that of the Moon ... After Galileo's telescopic observations of the crescent, gibbous and full phases of Venus, therefore, this Ptolemaic model became untenable ... Galileo's discovery of the phases of Venus was thus arguably his most empirically practically influential contribution to the two-stage transition from full geocentrism to full ...

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