short essays

Running head : Short Essays

Short Essays

Ans . 5 : If the stars move across the sky in circles centered directly overhead , the loacation of the observer would either be north pole or the south pole . This could be the location because the earth moves around the axes . This can be exaplained by looking at the following justification

Anyone who would be looking at the sky , would be always standing at the top of the earth . Therefore , the objectcs present at the celestial sphere which are classified relative to the ground willl occur

at the same point of the sphere . In to locate a person , we can mark the horizon diagonally to the mid of the celestial sphere , in such a way that the centre of the earth and the slestial sphere are identical . The observer 's view of the sky doesn 't matter , whether the sky 's view of the observer is the cut off position that is spotted by the horizon therfore the horizon is always kept perfect . The next points for reference would be the North Celestial Pole and the South Celestial Pole . If the person is standing at the equator , the pole would be horizontal through the Earth . If the observer is located at one of the poles , then these poles would go from the earth vertically . The north and the south celestial pole would be marked at the intersections . These intersections would be the result of exrtending the earth 's pole out to the celestial sphere If we are at the southern hemisphere , the south celestial pole would be below the horizon , which makes it to be on the opposite side of the celestial sphere and for northern hemisphere , this situation is inverted

Ans . 9 : Ptolemaic Model

The Ptolemaic model describes the obvious movement of the planets in a very direct and a straight way .this apporach is achieved by supposing that each planet of the solar system moves on a small and tiny sphere or circle . This circle is better known as epicycle . This epicycle moved on a larger sphere or circle . This larger sphere is called as a deferent It was assumed , that the stars move on a celestial sphere around the outside of the planetary spheres

Copernican Model

Copernican Model is better known as the sun centred solar system . This model explained that the true movement of the planets is not in a uniform circular motion , around . Due to this reason , the Copernican model would still need to have those small nad tiny circles on which the planets move , called the epicycles . The main feature of the Copernican model that differs this model from the ptolemaic model was the retrograde loops . These loops of the planets , the way they are seen from the Earth , arise physically as a result of the plantes motion altogether combined with the Earth 's motion

The Ptolemaic model was considered wrong because it was not precise and as the time passed by the predictiopn in the model proved...