Separate zodiacal faces from Egyptian stellar decans
In the Lilly-style dignity context, ‘face’ or zodiacal decan means one of three equal ten-degree portions inside a sign. It is a longitude classification: after choosing a zodiac, locate the degree in the sign and assign first, second, or third face. Its interpretive ruler, if used, comes from a named astrological table.
Egyptian stellar decans belong to a different historical setting of decanal stars and calendrical timekeeping. The shared word ‘decan’ is not enough to transfer a stellar list, an epoch, a visibility condition, or an interpretation into the zodiacal-face calculation. Name the system before comparing outputs.
William Lilly, Christian Astrology (1647), original printed p104 ↗William Lilly: Christian Astrology (1647), original text, pp. 101–112 ↗Metropolitan Museum: Senenmut astronomical ceiling ↗
Word origin · etymology
Late Latin numerical term.
Decanus meant a leader of ten. The astronomical and astrological label retains this association with ten.
How we know · epistemology
Historically distinct division systems
A zodiacal decan is a reproducible ten-degree partition once a zodiac is named; Egyptian stellar decans arose in a different calendrical and observational setting. Shared terminology does not justify importing one system’s stars, dates, or meanings into the other without identifying the method.
Metropolitan Museum: Senenmut astronomical ceiling ↗Lilly: Christian Astrology, annotated primary text ↗
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