In scientific and astrological works, the numerals, as, in Sanskrit, are expressed by symbolical words.
From this early astrological use the form of "glory" or "nimbus" has been adapted or inherited under new beliefs.
The great astrological work uses a term of still wider signification, Subartu, eventually Suri (written Su.
3 It is plain, however, that there is a long step between the astrological assignation of each hour of the week to a planet and the recognition of the week as an ordinary division of time by people at large.
He also finished his Tabulae Directionum (Nuremberg, '475), essentially an astrological work, but containing a valuable table of tangents.