Curiously enough, it appears that they regarded their art as locally limited to the regions inhabited by themselves and their kinsmen, so that while they could boldly predict storm, tempest, failing or abundant crops, war, famine, and the like, for Syria, Babylonia, and Susiana, they could venture on no prophecies with respect to other neighboring lands, as Persia, Media, Armenia.
A certain amount of real meteorological knowledge was probably mixed up with the Chaldaean astrology.

Their calendars, like modern almanacs, boldly predicted the weather for fixed days in the year.

They must also have been mathematicians to no inconsiderable extent, since their methods appear to have been geometrical.

It is said that the Greek mathematicians often quoted with approval the works of their Chaldaean predecessors, Ciden, Naburianus, and Sudinus.

Of the nature and extent of their mathematical acquirements, no account, however, can be given, since the writers who mention them enter into no details on the subject..