User:Ken McRitchie/sandbox4

Mechanisms
In 1975, amid increasing popular interest in astrology, a widely publicized article, "Objections to Astrology," published in The Humanist in the form of a manifesto signed by 186 scientists, sparked a controversy over astrological mechanisms. The article stated:

""We can see how infinitesimally small are the gravitational and other effects produced by the distant planets and the far more distant stars. It is simply a mistake to imagine that the forces exerted by stars and planets at the moment of birth can in any way shape our futures.""

Astronomer Carl Sagan, host of the award-winning TV series Cosmos, said that he found himself unable sign the "Objections" statement, not because he thought that astrology was valid, but because he found the statement's tone authoritarian, and because objections on the grounds of an unavailable mechanism can be mistaken. "No mechanism was known," Sagan wrote, "for continental drift (now subsumed in plate tectonics) when it was proposed by Alfred Wegener... The notion was roundly dismissed by all the great geophysicists, who were certain that continents were fixed." Sagan stated that he would instead have been willing to sign a statement describing and refuting the principal tenets of astrological belief, which he believed would have been more persuasive and would have produced less controversy.

Few modern astrologers believe that astrology can be explained by any direct causal mechanisms in the classical sense between planets and people. Researchers have posited acausal, purely correlational, relationships between astrological observations and events. For example, the theory of synchronicity proposed by Carl Jung, which draws from the ancient Hermetic principle of 'as above, so below,' postulates meaningful significance in unrelated events that occur simultaneously. Some astrologers have posited a basis in divination. Others have argued that empirical correlations stand on their own, and do not need the support of any theory or mechanism. A few researchers, such as astronomer Percy Seymour, have sought to describe a mechanism that could potentially explain astrology.