Evershed, M. A. (Orr) · London : Gall & Inglis · leaf 225
) andCor Leonis (Regulus). Stars a little less bright theycalled second magnitude: such are Alf arcatein andBenet Naax, Arab constellations which the Latinversion describes as the two bright stars of Ursa Minor, 188 ARAB ASTRONOMY. aud those brilliant ones in the tail of Ursa Major.Thus they… … Fig. 36. Method (erroneous) of estimating planetary distances,described by Alfraganus. The distance EA being known, and Up being assumed equal to it, the distance Eacan be calculated from the known ratio Ea : p a. which are the same as Ptolemys (See p. 155). This isfollowed by a list of the Arab…
Dante Alighieri, 1265-1321 · Astronomy
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