Orr, M. A. (Mary Acworth) · London and Edinburgh, Gall and Inglis · leaf 226
) andCor Leonis (Regulus). Stars a little less bright theycalled second magnitude: such are Alfarcatein 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 HA being known, and Ep being assumed equal to it, the distance Eacan be calculated from the known ratio Ea : pa. which are the same as Ptolemys (See p. 155). This isfollowed by a list of the Arab…
Dante Alighieri, 1265-1321 · Astronomy, Ancient · Astronomy, Medieval · Early maps
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
