Tycho Brahe

what position did Brahe have in 1597, who took over after him

imperial astronomer for the holy roman emperor

what compromise position did brahe develop between ptolemy and copernicus

he believed that all planets circle the sun, but that the sun in turn circled earth, which was always stationary

what was the problem with it

it was inaccurate

what did he observe in 1572

supernova (a star that increases in brightness as it explodes)

how did this challenge the pre existing ideas of the universe

it went against the established opinion that the universe was uniform and could not change

what did he publish in 1588

his findings of comets

how did this change his view of existing models of the universe

he concluded that comets existed outside the atmosphere of earth rather than inside it

how did he refute the idea of the perfect sphere

the path that was taken by these comets changed the idea of the perfect sphere