This is not a secure site, Iranian encyclopedia online, Very interesting detailed history of astronomy, and a long read, but thought a few of you might be interested as it talked about how the stars were classed by 3 magnitudes. You are not allowed to view links.
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Stars. While the term stā/ăr may refer to any of the luminous heavenly bodies, “fixed star” is either stārag ī awiyābānīg (Bundahišn; chap. 2.5, p. 27.6) or axtar; the latter also indicates “constellation” and “zodiacal sign.” Stars were classed physically according to three magnitudes (wuzurgīh); for these and for estimates of the size and velocity of the heavenly bodies, see Bundahišn, chap. 2 in Henning, “Astronomical Chapter.” Two levels were assigned to the stars. The upper level was that of the “stars not subject to mingling.” These fought the tenth battle of the original creation and kept the demons from ascending farther (Bundahišn, chap. 2.9, 6 I, pp. 28.1-10, 71.4-11 ). "