The Solar System - Physics

?

The Solar System

Models Of The Solar System

The ancient Greeks used a geocentric model of the Solar System, proposed by Ptolemy. In the geocentric model, the Earth was in the centre and everything else (the planets, Moon, Sun and stars) moved around the Earth in circular cycles. Ptolemy's model was very complicated and did not accurately predict the position of the planets. 

In the 14th century, Nikolaus Copernicus proposed a heliocentric model. This stated that:

  • The Sun was at the centre of the Solar System
  • The planets moved around the Sun in circular orbits and the Moon orbited the Earth
  • The planets further away from the Sun travelled more slowly than ones close to it
  • The stars were fixed in a dome beyond Saturn

The heliocentric model explained Mars's retrograde motion. However, it still did not accurately predict the position of the planets because Copernicus used circular orbits.

In the 1600's, Johannes Kepler realised that the planets had elliptical orbits. This model forms the basis for the one that

Comments

richa36

Report

the case study of swimming is good for students. swimming makes you active physically and improves your mental health. swimming goggles make it very comfortable for your eyes and before the exams, the body was determined and healthy. as like another important topic is zappi ev charger is a smart and electric vehicle.zappi was a 100% energy-generated charger from your solar PV system using the zappi ev charger power generation increase your investment if you are interested in to click on more blogs and get the more information. swimming is useful for students that like zappi charger is useful for all.