Since coming into the study of astrology, I have deeply pondered the mechanism behind its magical and profound workings.  Any student of the subject has surely been amazed by its exactitude and precision in the timing of events, bodily illness, and passing moods that sweep through us in any given day. It is the unending and uncanny accuracy of astrology that keeps me motivated to continue my study. I also believe that astrology can be used to aid in healing. For instance, medical astrology can often be as accurate as a laboratory test, yet looking at the astrological chart is completely non-invasive.

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Today you may carry a smart phone to help you calculate astrological charts while traveling. “For medieval physicians, the mnemic apparatus of choice was what is sometimes today known as a folding almanac or a belt book. There are thought to be just 29 such almanacs that have survived to the present day.”

The almanac was made using vellum, a tough paper made from an animal skin. It was folded, strung on a cord and hung from the belt. It was particularly useful for doctors as they made house calls.  Read More from The Atlantic.

Numerous studies have shown a link between season of birth and personality, mood swings, age when babies crawl and more. But before getting too excited, we should consider what these studies showing a seasonal biological effect are measuring and what the implications might be for astrology.

A 2010 study "provides the first evidence for seasonal imprinting of biological clocks in mammals." Using baby mice, the researchers showed that the imprinting at birth had "dramatic effects on the reaction of the biological clock to changes in season later in life." But the imprinting was not specific to the actual time of birth. "Exactly when the imprinting occurs during the three-week period leading up to weaning and whether the effect is temporary or permanent are questions the scientists intend to address in future experiments."

Other studies have shown that there is a link between our biological clock and diabetes, that fiddling with our biological clock can suppress cancer, that babies born in the winter and early spring have a higher risk of schizophrenia, and that the month of birth can affect allergies. The issue for astrologers is that these differences are specific to latitude. In other words, January in the northern hemisphere shows the same results as July in the southern hemisphere. And it appears that these differences do not show up on the equator.

So, does this type of research really provide positive evidence for Sun sign astrology? If so, does this mean we need to modify how we practice astrology to better account for seasonal variations by latitude?