1. Stellae, sidera, and astra differ from one another. For stella is any separate star. Sidera are made of very many stars, as Hyades, Pleiades. Astra are large stars as Orion, Bootes. But the writers confuse these names, putting astra for stella and stella for sidera.[273]
Chapter 61. On the light of the stars.
1. Stars are said to have no light of their own, but to be lighted by the sun like the moon.
Chapter 62. On the position of the stars.
1. Stars are motionless, and being fixed are carried along by the heavens in perpetual course, and they do not set by day but are obscured by the brilliance of the sun.
Chapter 63. On the courses of the stars.
1. Stars either are borne along or have motion. Those are borne along which are fixed in the heavens and revolve with the heavens. Certain have motion, like the planets, that is, the wandering stars, which go through roaming courses, but with definite limitations.
Chapter 64. On the varying courses of the stars.
1. According as stars are carried on different orbits of the heavenly planets, certain ones rise earlier and set later, and certain rising later come to their setting earlier. Others rise together and do not set at the same time. But all in their own time revolve in a course of their own.
Chapter 65. On the distances of the stars.