The planet was a simple disk, without marks. The observation of Mars through our weak Galilean telescopes yielded a bright disk, just as Galileo described in Siderius Nuncius (15). Moons, an assertion which was later proven true. Knowing that Galileo's previous discoveries had been Jupiter's moons, assumed Keplerīecame aware of an anagram Galileo had written about the rings of Saturn. Thus few, if any, people knew the nature of the planet's orbit before Galileo.Īn interesting piece of information regarding the consideration of Marsĭuring Galileo's time involves guesswork on the number of moons ot has. These differences in distance were undetectable without the telescope. Galileo's mind, is spending more time catching up with Mars and so the Jupiter and other planets with more pronounced retrogressions. Of Mars, attributing the rare retrogressions to its quicker orbit compared to Galileo also discusses the retrograde motion Of its orbit than at others ( The Galileo Affair, 61). States that the planet is close to four times bigger at certain points The telescope improved upon these observations, showing a distance from the earth of 6-8 arcminutes at the closest approach to earth and 25 arcminutes at the maximum distance. These differences were attributed to differences in distance. Before Galileo, astronomers had noted a difference in the brightness The planets revolve around a fixed point which is not the earth. Use observations of the distance Mars gets from Earth to support his claim that Galileo never mentions observations of Mars in Siderius Nuncius, but he does Galileo and Mars Galileo and the Red Planet of Mars
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