armillary sphere: a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars
celestial globe: a globe that is a spherical model of the heavens
cycadopsida: palmlike gymnosperms: includes the surviving order Cycadales and several extinct orders; possibly not a natural group; in some systems considered a class (Cycadopsida) and in others a subdivision (Cycadophytina or Cycadophyta)