Nonagon. A planetary aspect in which two planets or bodies are 40 degrees apart. Also spelled "nonagen." Noon Date. See "Adjusted Calculation Date." North Node. See "Nodes." ...
Kepler rejected aspects based upon geometric figures like the 7-sided septagon and 9-sided nonagon because they cannot be constructed with straight-edge and compasses - the only instruments permissible in classical geometry.
See also: Natural, Symbol, Prediction, Planetary Orb, Perfect
 
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