Cancer 17: Naming the Older Systems, and Charubel's Image

The decan and term already recorded for this degree trace to two named ancient writers. Vettius Valens, writing in Greek around the year 175, divided each sign into three ten degree faces under a rotating planetary sequence, leaving Mercury to rule this decan, the second of Cancer, and Ptolemy's Tetrabiblos separately preserves the Egyptian bounds table, keeping this degree under Jupiter's term as well, the two ancient divisions agreeing here. Neither writer pictured anything, only ruled it. The first complete pictorial set for all 360 degrees survives whole in 1494, in Johannes Angelus's Latin Astrolabium Planum, safely public domain but never freely translated into English.

The next complete English set is Welsh minister John Thomas's, writing as Charubel in 1898, whose entry for this degree describes an artificial globe, a made object standing in for the whole earth rather than the earth itself, a picture of representation substituting for the real thing. Practically, this degree is mostly used to time events through progressions or to flag two charts sharing it closely enough to matter in synastry, both applications considerably younger than the systems named above. None of this technical layering depends on which picture tradition a reader consults, since the decan and term rulers were fixed centuries before either Charubel's book or the Sabian material gave this point in the zodiac a scene of its own.