Word origin · etymology
Latin constellation and sign name.
Leo means lion; the sign retains the constellation's animal-name.
How we know · epistemology
Zodiac convention with traditional symbolism
Leo is the fifth equal sector and is traditionally fixed fire. The sign uses a defined longitude interval rather than a boundary traced around the Lion constellation; interpretations of confidence or visibility require a separate evidential step.
Deborah Houlding: absolute zodiac longitude ↗Ptolemy: Tetrabiblos I.4–24, Robbins translation ↗Astrodienst: The four Elements and the Signs (practitioner account) ↗
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