דניאל א:כ פירוש: רש״י

the necromancers These are the ones who inquire of טִימֵי מֵתִים, the bones of the dead, as you say, “May his bones be crushed,” שְּׁחִיק טַמַיָא.

the astrologers These are the ones who “press” the constellation. So it is explained in Tanhuma (Miketz 2, Buber, Miketz 4).