Question

Give difference between earth- centered and sun- centered models.

Answer 1

First is sun is at the centre in SCM(sun centered model) and earth is in ECM.

Second is in SCM force of gravity between sun and moving planets/bodies around it create centripetal or required acceleration.In ECM gravitational force of earth will do this work.

Earth centred models may collide in a time less that SCM.

Number of Objects moving round in SCM and ECM will differ as gravitational force in both is not same and of different capacity and limits.

Thanks.
Tripathy