Jane L. Jervis's Cometary Theory in Fifteenth-Century Europe PDF

By Jane L. Jervis

Ebook by means of Jervis, Jane L.

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Extra resources for Cometary Theory in Fifteenth-Century Europe

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This present exhalation had been building up for some time and Jacobus describes three unusual meteorological phenomena, in 1399, 1400, and 1401, which gave evidence of the accumulating vapors; they all occurred in Swabia, which shows that the effects of this comet will be most pronounced in Swabia. Astrologers determine the area to be affected by a comet from the direction of its tail, Jacobus continues in chapter eight. According to them, effects wilt be strongest in longitudinem septimi climatis, the same designation given in the observational passage quoted above.

To get the obliquity of the ecliptic from the maximum elevation of the sun, he would have had to have an independent vaule for the latitude of Florence. To have any hold at all on the motion of the eighth sphere, or precession, he would have had to have an independent value for the latitude of Florence, solstice, impossible with such an instrument as this, and to have made a series of observations over a long period of time- With the information at hand, it is not possible to state positively what the original purpose of the gnomon was, nor who its author was.

Folios 237 and 235 are from 1456, or at least are transcriptions of documents from 1456. The 1480 return is in yet another hand and on completely different and much larger paper. Nowhere in the tax returns is the name Toscanelli used. The ages and biographical information concur with what is known about Paolo Toscanelli, but this is hardly surprising since Uzieili used these tax returns as his primary source. The location of the house described in the returns is on a street at the end of which was a well {pozzo or puteo) called Toscanelli, or erf Tuscany (Uzieili 1884: 7); there was in that neighborhood a Via del Pozzo Toscanelli, though it did not coincide with the present Via Toscanelli, also in the same neighborhood.

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Cometary Theory in Fifteenth-Century Europe by Jane L. Jervis


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