Leonian vs astrological sign

Leonian

noun
  • Someone with the Leo star sign. 

adj
  • Of, or pertaining to, the Leo star sign. 

astrological sign

noun
  • Any of twelve signs, corresponding to constellations, that are used as the basis of astrology 

How often have the words Leonian and astrological sign occurred in a corpus of books? (source: Google Ngram Viewer )