Astronomy Essay Example | Topics and Well Written Essays - 500 words - 8

Astronomy - Essay ExampleAstronomical units are used for any measure which has a certain reasonable length that humans can attain or reach. Light-years are usually reserved for objects too far away to eer be reached by one humans lifetime.Stellar magnitude is the size and direction of a star. This is basically the stars displacement. The distinction betwixt absolute and apparent magnitudes is that absolute magnitudes are fixed, real-time figures of informationwhereas apparent magnitudes are just estimates based on what the human eye can see. That is the difference between the two phrases.Hipparchus originally drew his magnitude subdue using very rudimentary calculations and tools. Todays astronomers stir modified it slightly by using more advanced techniques and a much more modern approach to the magnitude scale. Now, physics students all over use the magnitude scale developed by todays most advanced and talented scientists.A. Compare the Ptolemaic and Copernican models of the u niverse. State the main tenet of each possible action how they are alike or different, what evidence each used to support the ideas, and how each explained the retrograde motion of the inner planets. (150 words)The Ptolemaic model of the universe declared that the universe revolve around the earth. Copernican theory stated that the model of the universe which was correct basically involved the universe revolving around the sun. They are both(prenominal) alike in the fact that both models involved the universe revolving around somethingit was just that Ptolemy got it wrong. The evidence that Ptolemy used to support his claim was basically, he didnt have evidence. It was by royal decree that the ruler in power wanted the earth to be the center of the universe. The evidence Copernicus used to show that the earth revolved around the sun was the entity of the eclipseshowing that the