Orr, M. A. (Mary Acworth) · London and Edinburgh, Gall and Inglis · leaf 151
motion. The gnomon told them the dayof the equinox (see p. 25), and on that day the sunwas in the equator: therefore, if a circle was set upso that the shadow of the upper part fell symmetricallyupon the lower, with a little line of light each side,it must be exactly in the plane of the equator.… … < 5 < a. THE SCHOOL OF ALEXANDRIA. 117 Since the ecliptic is the path of the sun as seen inthe sky, it is obvious that it could be determined froma number of different observations of his position atdifferent times of the year. Finally, accurate solar tables vrere drawn up, showingthe suns…
Dante Alighieri, 1265-1321 · Astronomy, Ancient · Astronomy, Medieval · Early maps
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