Mercury retrograde: what it means in astrology
What astrological tradition associates with this period, and how it differs from the real astronomical phenomenon.
What the astronomical phenomenon is (summary)
Mercury, like any planet seen from Earth, sometimes appears to move backward across the sky for a few weeks. This is a real optical effect, caused by the difference in orbital speed between Earth and Mercury — no planet actually reverses its orbit. The exact dates for each period vary year to year and are an astronomical-calendar fact, not covered on this page.
What astrology reads into this period
Because Mercury is traditionally associated with communication, travel, technology and agreements, astrology reads the retrograde period as prone to delays, misunderstandings, lost emails and glitchy devices. A common piece of traditional advice is therefore to avoid signing major contracts or launching new projects during this period, and to favour revisiting things already underway.
Cuidado
Tradition, not a proven cause
Glossário: os termos desta página
Retrograde: astrology vs. astronomy
In astronomy, "retrograde" describes a real optical effect: seen from Earth, a planet appears to move backward across the sky for weeks, due to the difference in orbital speed between the two planets. In astrology, the same period is given an interpretive meaning (delays, revisiting plans) that is not a physical phenomenon, but a traditional reading of it.
Tradition/belief vs. fact
A distinction used on this site: something is treated as fact when it can be independently verified (a calendar date, an old translation); it is treated as tradition or belief when it is a cultural or spiritual interpretation with no scientific proof — such as horoscopes and numerology.
Glossary: religion and spirituality — todos os 11 termos.