At about the same time Kepler discovered his three laws what did Galileo and Tycho find, discover?

Answer 1

Tycho had built the observatory and recorded the observations of planetary positions that provided Kepler with the data he needed to figure out the laws of planetary motion. But Tycho died in 1601, about eight years before Kepler published his first two laws of planetary motion.

The same year that Kepler published "New Astronomy", Galileo built his first telescope and started observing the heavens. Kepler published his third law in 1619. Galileo was involved in a dispute about the nature of comets. This was one of the things that Galileo got wrong - he did not accept that they were in orbit around the sun.

Answer 2

Tycho built vast instruments to set accurate sights on the stars, and used multiple clocks and timekeepers to record planetary positions ten times more accurately than the best previous work. He achieved his goal of measuring to one minute of arc. This was a tremendous feat before the invention of the telescope. His aim was to confirm his own picture of the universe, which was that the earth was at rest, the sun went around the earth and the planets all went around the sun - an intermediate picture between Ptolemy and Copernicus.

Galileo was the first to use a telescope to look at the sky. He discovered mountains on the Moon, Jupiter's moons, the phases of Venus, sunspots, and the rings of Saturn, although his telescopes were not good enough to show them as rings, so he thought they were two large and close moons.

Answer 3

Galileo Galilei made several discoveries. One of those was that the Earth revolves around itself and that the Earth orbits the Sun. Also was the first to use a telescope and to observe the Galilean moons of Jupiter (hence the name): Io, Europa, Ganymede and Callisto.

Tycho Brahe revised the geocentric model to a model of his own, now known as the "Tychonic system" whereby the planets (Mercury, Mars, Jupiter, Venus, etc) rotate around the Sun; the Sun and all that system in turn rotates around the Earth according to Brahe's model.

Answer 4

Hi. Unexplainable phenomenon such as the phases of Venus and the moons of Jupiter. Tycho developed the Tyconic system. http://en.wikipedia.org/wiki/Tychonic_system as an alternative to the Copernican system.

Answer 5

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