Aspects, Malefic

Those based on 2, combine signs that are less congenial, and operate generally at cross-purposes, hence are termed malefic. Modern astrologers tend to refer malefic aspects between harmonious planets, to benefic aspects between malefic planets – but this enters into the realm of interpretation where mathematics yields to psychology. A plent thus aspected, particularly if by a malefic planet, is said to be afflicted.
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The malefic aspects were the square and semisquare. The opposition is generally classed as malefic, even though it combines signs that are moderately congenial. These are generally deemed conducive of friction, in that two opposing forces challenge the individual’s capacity for adjustment.

DeVore, Nicholas. Encyclopedia of Astrology. New York: Philosophical Library, 1947.