Mercury, the Messenger God in Astrology
Mercury is similar to the Moon in that it represents the mind, but in a more analytical, discriminative and communicative way. It codes and decodes the thoughts and feelings we have and receive from others, and it is very connective in a rational way.
Mercury being one of the bright stars in the night sky is also appropriately bright and cheerful in its expression in our lives. Mercury is a rajasic benefic, therefore it delivers good experiences, expanding knowledge and experiences, but it can be rather infatuated, distracted, and sometimes obsessed with more sensate and exciting things that do not necessarily bring one to enlightenment and spiritual liberation.
Mercury represents how we see and perceive the world and the various filters, biases, and errors that might creep into that perception of ourselves and the world (based on potential afflictions of Mercury in your chart). The mind is what contains and defines the world we live in; without which we would not be able to do much. What we think is what determines our experiences in the world, and Mercury is associated with those processes.
As Mercury in myth was the god of thieves there is a mischievousness to its nature. It is a very bright star in the sky and benefic in its effects. Transits and progressions to or from Mercury usually coincide with important communications, whether they be verbal, written, or electronic, and periods of time where one is “using one’s head”.
In Vedic astrology Mercury is called Buddha, associated with the seed (bija) syllableS BUM (“put”) and AIM, and the mantra OM BUDHYA NAMAHA.