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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Mars effect | 1/3 | https://en.wikipedia.org/wiki/Mars_effect | reference | science, encyclopedia | 2026-05-05T09:22:41.924157+00:00 | kb-cron |
The Mars effect is a purported statistical correlation between athletic eminence and the position of the planet Mars relative to the horizon at time and place of birth. This controversial finding was first reported by the French psychologist and "neo-astrologer" Michel Gauquelin. In his book L'influence des astres ("The Influence of the Stars", 1955), Gauquelin suggested that a statistically significant number of sports champions were born just after the planet Mars rises or culminates. He also divided the plane of the ecliptic into twelve sectors, identifying two "key" sectors of statistical significance. Gauquelin's work was accepted by the psychologist Hans Eysenck among others but later attempts to validate the data and replicate the effect have produced uneven results, chiefly owing to disagreements over the selection and analysis of the data set. Since the phenomenon in question depends upon the daily rotation of the Earth, the availability and accuracy of time and place of birth data is crucial to such studies, as is the criterion of "eminence". Later research claims to explain the Mars effect by selection bias, favouring champions who were born in a key sector of Mars and rejecting those who were not from the sample.
== Reception and replication == Gauquelin's work was not limited to the Mars effect: his calculations led him first to reject most of the conventions of natal astrology as it is practised in the modern west but he singled out "highly significant statistical correlations between planetary positions and the birth times of eminently successful people." This claim concerned not only Mars but five planets, correlated with eminence in fields broadly compatible with the traditional "planetary rulerships" of astrology. However, partly because eminence in sport is more quantifiable, later research, publicity and controversy has tended to single out the "Mars effect".
=== Belgian athletes – the Comité Para === In 1956 Gauquelin invited the Belgian Comité Para to review his findings but it was not until 1962 that Jean Dath corroborated the statistics Gauquelin had presented and suggested an attempt at duplication using Belgian athletes. By this time Gauquelin had published Les Hommes et Les Astres (Men and the Stars, 1960), offering further data. The Comité Para tested the Mars effect in 1967 and replicated it, though most of the data (473 of 535) were still collected by Gauquelin himself. The committee, suspecting that the results might have been an artifact, withheld its findings for a further eight years, then cited unspecified “demographic errors” in its findings. Unpublished internal analyses contradicted this and one committee member, Luc de Marré, resigned in protest. In 1983 Abell, Kurtz and Zelen (see below) published a reappraisal, rejecting the idea of demographic errors, saying, “Gauquelin adequately allowed for demographic and astronomical factors in predicting the expected distribution of Mars sectors for birth times in the general population.”