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Explain how geocentric theory is required by helliocentric theory using the idea of retrograde motion of planets.

Answer» <html><body><p></p>Solution :(i) To explain this retrograde <a href="https://interviewquestions.tuteehub.com/tag/motion-1104108" style="font-weight:bold;" target="_blank" title="Click to know more about MOTION">MOTION</a>, Ptolemy introduced the concept of "epicycle" in his <a href="https://interviewquestions.tuteehub.com/tag/geocentric-2093615" style="font-weight:bold;" target="_blank" title="Click to know more about GEOCENTRIC">GEOCENTRIC</a> model. According to this theory, while the <a href="https://interviewquestions.tuteehub.com/tag/planet-1155613" style="font-weight:bold;" target="_blank" title="Click to know more about PLANET">PLANET</a> orbited the Earth, it also underwent <a href="https://interviewquestions.tuteehub.com/tag/another-876628" style="font-weight:bold;" target="_blank" title="Click to know more about ANOTHER">ANOTHER</a> circular motion termed as "epicycle". <br/> (ii) A combination of epicycle and circular motion around the Earth gave rise to retrograde motion of the planets with respect to Earth. <br/> (iii) But Ptolemy's model became more and more complex as every planet was found to undergo retrograde motion. <br/> (iv) In the 15th century, the Polish astronmer Copernics proposed.<br/> (v) The helicentric model to explain this problem in a simpler manner. According to this model, the Sun is at the center of the solar system and all planets orbited the Sun. <br/> (<a href="https://interviewquestions.tuteehub.com/tag/vi-723586" style="font-weight:bold;" target="_blank" title="Click to know more about VI">VI</a>) The retrograde motion of planets with respect to Earth is because of the relative motion of the planet with respect to Earth.</body></html>


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