The life of Ptolomy is vague, as is the reaction to his works at the time. His system of astronomy, which is in his book the Syntaxis, was accepted as correct until the year 1543 AD. In this system, the earth was the center of the universe, and was the axis of a huge rotating sphere, which spun. On the outer edges of the sphere were the stars, and the sun and other heavenly bodies were in between the earth and stars... displayed 300 characters
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On the outer edges of the sphere were the stars, and the sun and other heavenly bodies were in between the earth and stars. Ptolomy accounted for the movement of the planets using three mathematical constructions: the eccentric, epicycle, and the equant. The eccentric construction is the only one of the three not centered on the earth... displayed next 300 characters
It dealt with "what is easiest and most useful". Considered as an elementary textbook of practical mathematics, the Al-jabr wa'l-muqabala began with a discussion of the algebra of first and second degree equations and moved on in its final two parts to the business of practical applications to questions on mensuration and legacies...
Rheticus became enamored with Copernicus and sought him out after reading one of his essays. Rheticus paid a visit to Copernicus' home, he anticipated staying only a few short weeks, but in 1539, Copernicus took Rheticus under his wing as a student...
Bufford often used five or more colours in his work; he laid his colour prints down before printing a final layer of black which assembled his image, for an example of his work see ?the Swedish song quartet'...
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