Here, for example, is what Maharam Alashkar has to say:
[than Rabbeinu Tam] , for they both believe that the firmament is like an arched room, and the sphere is stationary and the constellations revolve, and the sun itself travels below the [cover of the] [western] [upper] [eastern] end, at which point dawn occurs; and sunrise happens when it reaches the [lower] [Yehudah Hanasi] [of the gentile sages] [i.e., that the sphere, not the constellations, rotate: the view of the gentile sages] .