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... generally and it is not infrequent to find Departments of Astronomy and Astrophysics within educational establishments The question may well be asked ‘What is the difference between Astronomy and Astrophysics?’... distance between Syene and Alexandria Eratosthenes then made the assumptions that the Sun was very far away and that the Earth was spherical The Sun’s rays arriving at Syene and Alexandria could then... Peak.) for measurement New branches of γ -ray, x-ray and infrared astronomy are currently increasing the information that we have concerning the extra-terrestrial bodies Although the large range