The event that convinced Brahe that neither the Heliocentric nor the Geocentric models were correct was D. The conjunction of Jupiter and Saturn.
Tycho Brahe was an astronomer famous for developing astronomical instruments and his accurate and comprehensive astronomical observations.
Trained as a lawyer, Brahe turned to astronomy in 1563 when he observed the conjunction of Jupiter and Saturn.
Brahe's observations of Jupiter and Saturn showed that existing astronomical tables produced under the Heliocentric and geocentric models were inaccurate.
In the Heliocentric astronomical model championed by Nicolaus Copernicus, the Sun lies at or near a central point of the solar system or the universe while other planets revolve around it.
Under the geocentric model or Ptolemaic system, the Sun and other planets orbit Earth.
Thus, the event that convinced Brahe that neither the Heliocentric nor the Geocentric models were correct was D. The conjunction of Jupiter and Saturn.
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